Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * xact.c
4 : : * top level transaction system support routines
5 : : *
6 : : * See src/backend/access/transam/README for more information.
7 : : *
8 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
9 : : * Portions Copyright (c) 1994, Regents of the University of California
10 : : *
11 : : *
12 : : * IDENTIFICATION
13 : : * src/backend/access/transam/xact.c
14 : : *
15 : : *-------------------------------------------------------------------------
16 : : */
17 : :
18 : : #include "postgres.h"
19 : :
20 : : #include <time.h>
21 : : #include <unistd.h>
22 : :
23 : : #include "access/commit_ts.h"
24 : : #include "access/multixact.h"
25 : : #include "access/parallel.h"
26 : : #include "access/subtrans.h"
27 : : #include "access/transam.h"
28 : : #include "access/twophase.h"
29 : : #include "access/xact.h"
30 : : #include "access/xlog.h"
31 : : #include "access/xloginsert.h"
32 : : #include "access/xlogrecovery.h"
33 : : #include "access/xlogutils.h"
34 : : #include "access/xlogwait.h"
35 : : #include "catalog/index.h"
36 : : #include "catalog/namespace.h"
37 : : #include "catalog/pg_enum.h"
38 : : #include "catalog/storage.h"
39 : : #include "commands/async.h"
40 : : #include "commands/tablecmds.h"
41 : : #include "commands/trigger.h"
42 : : #include "common/pg_prng.h"
43 : : #include "executor/spi.h"
44 : : #include "libpq/be-fsstubs.h"
45 : : #include "libpq/pqsignal.h"
46 : : #include "miscadmin.h"
47 : : #include "pg_trace.h"
48 : : #include "pgstat.h"
49 : : #include "replication/logical.h"
50 : : #include "replication/logicallauncher.h"
51 : : #include "replication/logicalworker.h"
52 : : #include "replication/origin.h"
53 : : #include "replication/snapbuild.h"
54 : : #include "replication/syncrep.h"
55 : : #include "storage/aio_subsys.h"
56 : : #include "storage/condition_variable.h"
57 : : #include "storage/fd.h"
58 : : #include "storage/lmgr.h"
59 : : #include "storage/md.h"
60 : : #include "storage/predicate.h"
61 : : #include "storage/proc.h"
62 : : #include "storage/procarray.h"
63 : : #include "storage/sinvaladt.h"
64 : : #include "storage/smgr.h"
65 : : #include "utils/builtins.h"
66 : : #include "utils/combocid.h"
67 : : #include "utils/guc.h"
68 : : #include "utils/inval.h"
69 : : #include "utils/memutils.h"
70 : : #include "utils/relmapper.h"
71 : : #include "utils/snapmgr.h"
72 : : #include "utils/timeout.h"
73 : : #include "utils/timestamp.h"
74 : : #include "utils/typcache.h"
75 : : #include "utils/wait_event.h"
76 : :
77 : : /*
78 : : * User-tweakable parameters
79 : : */
80 : : int DefaultXactIsoLevel = XACT_READ_COMMITTED;
81 : : int XactIsoLevel = XACT_READ_COMMITTED;
82 : :
83 : : bool DefaultXactReadOnly = false;
84 : : bool XactReadOnly;
85 : :
86 : : bool DefaultXactDeferrable = false;
87 : : bool XactDeferrable;
88 : :
89 : : int synchronous_commit = SYNCHRONOUS_COMMIT_ON;
90 : :
91 : : /*
92 : : * CheckXidAlive is a xid value pointing to a possibly ongoing (sub)
93 : : * transaction. Currently, it is used in logical decoding. It's possible
94 : : * that such transactions can get aborted while the decoding is ongoing in
95 : : * which case we skip decoding that particular transaction. To ensure that we
96 : : * check whether the CheckXidAlive is aborted after fetching the tuple from
97 : : * system tables. We also ensure that during logical decoding we never
98 : : * directly access the tableam or heap APIs because we are checking for the
99 : : * concurrent aborts only in systable_* APIs.
100 : : */
101 : : TransactionId CheckXidAlive = InvalidTransactionId;
102 : : bool bsysscan = false;
103 : :
104 : : /*
105 : : * When running as a parallel worker, we place only a single
106 : : * TransactionStateData on the parallel worker's state stack, and the XID
107 : : * reflected there will be that of the *innermost* currently-active
108 : : * subtransaction in the backend that initiated parallelism. However,
109 : : * GetTopTransactionId() and TransactionIdIsCurrentTransactionId()
110 : : * need to return the same answers in the parallel worker as they would have
111 : : * in the user backend, so we need some additional bookkeeping.
112 : : *
113 : : * XactTopFullTransactionId stores the XID of our toplevel transaction, which
114 : : * will be the same as TopTransactionStateData.fullTransactionId in an
115 : : * ordinary backend; but in a parallel backend, which does not have the entire
116 : : * transaction state, it will instead be copied from the backend that started
117 : : * the parallel operation.
118 : : *
119 : : * nParallelCurrentXids will be 0 and ParallelCurrentXids NULL in an ordinary
120 : : * backend, but in a parallel backend, nParallelCurrentXids will contain the
121 : : * number of XIDs that need to be considered current, and ParallelCurrentXids
122 : : * will contain the XIDs themselves. This includes all XIDs that were current
123 : : * or sub-committed in the parent at the time the parallel operation began.
124 : : * The XIDs are stored sorted in numerical order (not logical order) to make
125 : : * lookups as fast as possible.
126 : : */
127 : : static FullTransactionId XactTopFullTransactionId = {InvalidTransactionId};
128 : : static int nParallelCurrentXids = 0;
129 : : static TransactionId *ParallelCurrentXids;
130 : :
131 : : /*
132 : : * Miscellaneous flag bits to record events which occur on the top level
133 : : * transaction. These flags are only persisted in MyXactFlags and are intended
134 : : * so we remember to do certain things later on in the transaction. This is
135 : : * globally accessible, so can be set from anywhere in the code that requires
136 : : * recording flags.
137 : : */
138 : : int MyXactFlags;
139 : :
140 : : /*
141 : : * transaction states - transaction state from server perspective
142 : : */
143 : : typedef enum TransState
144 : : {
145 : : TRANS_DEFAULT, /* idle */
146 : : TRANS_START, /* transaction starting */
147 : : TRANS_INPROGRESS, /* inside a valid transaction */
148 : : TRANS_COMMIT, /* commit in progress */
149 : : TRANS_ABORT, /* abort in progress */
150 : : TRANS_PREPARE, /* prepare in progress */
151 : : } TransState;
152 : :
153 : : /*
154 : : * transaction block states - transaction state of client queries
155 : : *
156 : : * Note: the subtransaction states are used only for non-topmost
157 : : * transactions; the others appear only in the topmost transaction.
158 : : */
159 : : typedef enum TBlockState
160 : : {
161 : : /* not-in-transaction-block states */
162 : : TBLOCK_DEFAULT, /* idle */
163 : : TBLOCK_STARTED, /* running single-query transaction */
164 : :
165 : : /* transaction block states */
166 : : TBLOCK_BEGIN, /* starting transaction block */
167 : : TBLOCK_INPROGRESS, /* live transaction */
168 : : TBLOCK_IMPLICIT_INPROGRESS, /* live transaction after implicit BEGIN */
169 : : TBLOCK_PARALLEL_INPROGRESS, /* live transaction inside parallel worker */
170 : : TBLOCK_END, /* COMMIT received */
171 : : TBLOCK_ABORT, /* failed xact, awaiting ROLLBACK */
172 : : TBLOCK_ABORT_END, /* failed xact, ROLLBACK received */
173 : : TBLOCK_ABORT_PENDING, /* live xact, ROLLBACK received */
174 : : TBLOCK_PREPARE, /* live xact, PREPARE received */
175 : :
176 : : /* subtransaction states */
177 : : TBLOCK_SUBBEGIN, /* starting a subtransaction */
178 : : TBLOCK_SUBINPROGRESS, /* live subtransaction */
179 : : TBLOCK_SUBRELEASE, /* RELEASE received */
180 : : TBLOCK_SUBCOMMIT, /* COMMIT received while TBLOCK_SUBINPROGRESS */
181 : : TBLOCK_SUBABORT, /* failed subxact, awaiting ROLLBACK */
182 : : TBLOCK_SUBABORT_END, /* failed subxact, ROLLBACK received */
183 : : TBLOCK_SUBABORT_PENDING, /* live subxact, ROLLBACK received */
184 : : TBLOCK_SUBRESTART, /* live subxact, ROLLBACK TO received */
185 : : TBLOCK_SUBABORT_RESTART, /* failed subxact, ROLLBACK TO received */
186 : : } TBlockState;
187 : :
188 : : /*
189 : : * transaction state structure
190 : : *
191 : : * Note: parallelModeLevel counts the number of unmatched EnterParallelMode
192 : : * calls done at this transaction level. parallelChildXact is true if any
193 : : * upper transaction level has nonzero parallelModeLevel.
194 : : */
195 : : typedef struct TransactionStateData
196 : : {
197 : : FullTransactionId fullTransactionId; /* my FullTransactionId */
198 : : SubTransactionId subTransactionId; /* my subxact ID */
199 : : char *name; /* savepoint name, if any */
200 : : int savepointLevel; /* savepoint level */
201 : : TransState state; /* low-level state */
202 : : TBlockState blockState; /* high-level state */
203 : : int nestingLevel; /* transaction nesting depth */
204 : : int gucNestLevel; /* GUC context nesting depth */
205 : : MemoryContext curTransactionContext; /* my xact-lifetime context */
206 : : ResourceOwner curTransactionOwner; /* my query resources */
207 : : MemoryContext priorContext; /* CurrentMemoryContext before xact started */
208 : : TransactionId *childXids; /* subcommitted child XIDs, in XID order */
209 : : int nChildXids; /* # of subcommitted child XIDs */
210 : : int maxChildXids; /* allocated size of childXids[] */
211 : : Oid prevUser; /* previous CurrentUserId setting */
212 : : int prevSecContext; /* previous SecurityRestrictionContext */
213 : : bool prevXactReadOnly; /* entry-time xact r/o state */
214 : : bool startedInRecovery; /* did we start in recovery? */
215 : : bool didLogXid; /* has xid been included in WAL record? */
216 : : int parallelModeLevel; /* Enter/ExitParallelMode counter */
217 : : bool parallelChildXact; /* is any parent transaction parallel? */
218 : : bool chain; /* start a new block after this one */
219 : : bool topXidLogged; /* for a subxact: is top-level XID logged? */
220 : : struct TransactionStateData *parent; /* back link to parent */
221 : : } TransactionStateData;
222 : :
223 : : typedef TransactionStateData *TransactionState;
224 : :
225 : : /*
226 : : * Serialized representation used to transmit transaction state to parallel
227 : : * workers through shared memory.
228 : : */
229 : : typedef struct SerializedTransactionState
230 : : {
231 : : int xactIsoLevel;
232 : : bool xactDeferrable;
233 : : FullTransactionId topFullTransactionId;
234 : : FullTransactionId currentFullTransactionId;
235 : : CommandId currentCommandId;
236 : : int nParallelCurrentXids;
237 : : TransactionId parallelCurrentXids[FLEXIBLE_ARRAY_MEMBER];
238 : : } SerializedTransactionState;
239 : :
240 : : /* The size of SerializedTransactionState, not including the final array. */
241 : : #define SerializedTransactionStateHeaderSize \
242 : : offsetof(SerializedTransactionState, parallelCurrentXids)
243 : :
244 : : /*
245 : : * CurrentTransactionState always points to the current transaction state
246 : : * block. It will point to TopTransactionStateData when not in a
247 : : * transaction at all, or when in a top-level transaction.
248 : : */
249 : : static TransactionStateData TopTransactionStateData = {
250 : : .state = TRANS_DEFAULT,
251 : : .blockState = TBLOCK_DEFAULT,
252 : : .topXidLogged = false,
253 : : };
254 : :
255 : : /*
256 : : * unreportedXids holds XIDs of all subtransactions that have not yet been
257 : : * reported in an XLOG_XACT_ASSIGNMENT record.
258 : : */
259 : : static int nUnreportedXids;
260 : : static TransactionId unreportedXids[PGPROC_MAX_CACHED_SUBXIDS];
261 : :
262 : : static TransactionState CurrentTransactionState = &TopTransactionStateData;
263 : :
264 : : /*
265 : : * The subtransaction ID and command ID assignment counters are global
266 : : * to a whole transaction, so we do not keep them in the state stack.
267 : : */
268 : : static SubTransactionId currentSubTransactionId;
269 : : static CommandId currentCommandId;
270 : : static bool currentCommandIdUsed;
271 : :
272 : : /*
273 : : * xactStartTimestamp is the value of transaction_timestamp().
274 : : * stmtStartTimestamp is the value of statement_timestamp().
275 : : * xactStopTimestamp is the time at which we log a commit / abort WAL record,
276 : : * or if that was skipped, the time of the first subsequent
277 : : * GetCurrentTransactionStopTimestamp() call.
278 : : *
279 : : * These do not change as we enter and exit subtransactions, so we don't
280 : : * keep them inside the TransactionState stack.
281 : : */
282 : : static TimestampTz xactStartTimestamp;
283 : : static TimestampTz stmtStartTimestamp;
284 : : static TimestampTz xactStopTimestamp;
285 : :
286 : : /*
287 : : * GID to be used for preparing the current transaction. This is also
288 : : * global to a whole transaction, so we don't keep it in the state stack.
289 : : */
290 : : static char *prepareGID;
291 : :
292 : : /*
293 : : * Some commands want to force synchronous commit.
294 : : */
295 : : static bool forceSyncCommit = false;
296 : :
297 : : /* Flag for logging statements in a transaction. */
298 : : bool xact_is_sampled = false;
299 : :
300 : : /*
301 : : * Private context for transaction-abort work --- we reserve space for this
302 : : * at startup to ensure that AbortTransaction and AbortSubTransaction can work
303 : : * when we've run out of memory.
304 : : */
305 : : static MemoryContext TransactionAbortContext = NULL;
306 : :
307 : : /*
308 : : * List of add-on start- and end-of-xact callbacks
309 : : */
310 : : typedef struct XactCallbackItem
311 : : {
312 : : struct XactCallbackItem *next;
313 : : XactCallback callback;
314 : : void *arg;
315 : : } XactCallbackItem;
316 : :
317 : : static XactCallbackItem *Xact_callbacks = NULL;
318 : :
319 : : /*
320 : : * List of add-on start- and end-of-subxact callbacks
321 : : */
322 : : typedef struct SubXactCallbackItem
323 : : {
324 : : struct SubXactCallbackItem *next;
325 : : SubXactCallback callback;
326 : : void *arg;
327 : : } SubXactCallbackItem;
328 : :
329 : : static SubXactCallbackItem *SubXact_callbacks = NULL;
330 : :
331 : :
332 : : /* local function prototypes */
333 : : static void AssignTransactionId(TransactionState s);
334 : : static void AbortTransaction(void);
335 : : static void AtAbort_Memory(void);
336 : : static void AtCleanup_Memory(void);
337 : : static void AtAbort_ResourceOwner(void);
338 : : static void AtCCI_LocalCache(void);
339 : : static void AtCommit_Memory(void);
340 : : static void AtStart_Cache(void);
341 : : static void AtStart_Memory(void);
342 : : static void AtStart_ResourceOwner(void);
343 : : static void CallXactCallbacks(XactEvent event);
344 : : static void CallSubXactCallbacks(SubXactEvent event,
345 : : SubTransactionId mySubid,
346 : : SubTransactionId parentSubid);
347 : : static void CleanupTransaction(void);
348 : : static void CheckTransactionBlock(bool isTopLevel, bool throwError,
349 : : const char *stmtType);
350 : : static void CommitTransaction(void);
351 : : static TransactionId RecordTransactionAbort(bool isSubXact);
352 : : static void StartTransaction(void);
353 : :
354 : : static bool CommitTransactionCommandInternal(void);
355 : : static bool AbortCurrentTransactionInternal(void);
356 : :
357 : : static void StartSubTransaction(void);
358 : : static void CommitSubTransaction(void);
359 : : static void AbortSubTransaction(void);
360 : : static void CleanupSubTransaction(void);
361 : : static void PushTransaction(void);
362 : : static void PopTransaction(void);
363 : :
364 : : static void AtSubAbort_Memory(void);
365 : : static void AtSubCleanup_Memory(void);
366 : : static void AtSubAbort_ResourceOwner(void);
367 : : static void AtSubCommit_Memory(void);
368 : : static void AtSubStart_Memory(void);
369 : : static void AtSubStart_ResourceOwner(void);
370 : :
371 : : static void ShowTransactionState(const char *str);
372 : : static void ShowTransactionStateRec(const char *str, TransactionState s);
373 : : static const char *BlockStateAsString(TBlockState blockState);
374 : : static const char *TransStateAsString(TransState state);
375 : :
376 : :
377 : : /* ----------------------------------------------------------------
378 : : * transaction state accessors
379 : : * ----------------------------------------------------------------
380 : : */
381 : :
382 : : /*
383 : : * IsTransactionState
384 : : *
385 : : * This returns true if we are inside a valid transaction; that is,
386 : : * it is safe to initiate database access, take heavyweight locks, etc.
387 : : */
388 : : bool
10768 bruce@momjian.us 389 :CBC 197741632 : IsTransactionState(void)
390 : : {
10467 391 : 197741632 : TransactionState s = CurrentTransactionState;
392 : :
393 : : /*
394 : : * TRANS_DEFAULT and TRANS_ABORT are obviously unsafe states. However, we
395 : : * also reject the startup/shutdown states TRANS_START, TRANS_COMMIT,
396 : : * TRANS_PREPARE since it might be too soon or too late within those
397 : : * transition states to do anything interesting. Hence, the only "valid"
398 : : * state is TRANS_INPROGRESS.
399 : : */
6907 tgl@sss.pgh.pa.us 400 : 197741632 : return (s->state == TRANS_INPROGRESS);
401 : : }
402 : :
403 : : /*
404 : : * IsAbortedTransactionBlockState
405 : : *
406 : : * This returns true if we are within an aborted transaction block.
407 : : */
408 : : bool
9324 409 : 948027 : IsAbortedTransactionBlockState(void)
410 : : {
10467 bruce@momjian.us 411 : 948027 : TransactionState s = CurrentTransactionState;
412 : :
7919 413 [ + + ]: 948027 : if (s->blockState == TBLOCK_ABORT ||
7978 tgl@sss.pgh.pa.us 414 [ + + ]: 946059 : s->blockState == TBLOCK_SUBABORT)
10467 bruce@momjian.us 415 : 2378 : return true;
416 : :
417 : 945649 : return false;
418 : : }
419 : :
420 : :
421 : : /*
422 : : * GetTopTransactionId
423 : : *
424 : : * This will return the XID of the main transaction, assigning one if
425 : : * it's not yet set. Be careful to call this only inside a valid xact.
426 : : */
427 : : TransactionId
7978 tgl@sss.pgh.pa.us 428 : 36391 : GetTopTransactionId(void)
429 : : {
2595 tmunro@postgresql.or 430 [ + + ]: 36391 : if (!FullTransactionIdIsValid(XactTopFullTransactionId))
6817 tgl@sss.pgh.pa.us 431 : 578 : AssignTransactionId(&TopTransactionStateData);
2595 tmunro@postgresql.or 432 : 36391 : return XidFromFullTransactionId(XactTopFullTransactionId);
433 : : }
434 : :
435 : : /*
436 : : * GetTopTransactionIdIfAny
437 : : *
438 : : * This will return the XID of the main transaction, if one is assigned.
439 : : * It will return InvalidTransactionId if we are not currently inside a
440 : : * transaction, or inside a transaction that hasn't yet been assigned an XID.
441 : : */
442 : : TransactionId
6817 tgl@sss.pgh.pa.us 443 : 85925831 : GetTopTransactionIdIfAny(void)
444 : : {
2595 tmunro@postgresql.or 445 : 85925831 : return XidFromFullTransactionId(XactTopFullTransactionId);
446 : : }
447 : :
448 : : /*
449 : : * GetCurrentTransactionId
450 : : *
451 : : * This will return the XID of the current transaction (main or sub
452 : : * transaction), assigning one if it's not yet set. Be careful to call this
453 : : * only inside a valid xact.
454 : : */
455 : : TransactionId
9324 tgl@sss.pgh.pa.us 456 : 17143162 : GetCurrentTransactionId(void)
457 : : {
10467 bruce@momjian.us 458 : 17143162 : TransactionState s = CurrentTransactionState;
459 : :
2595 tmunro@postgresql.or 460 [ + + ]: 17143162 : if (!FullTransactionIdIsValid(s->fullTransactionId))
6817 tgl@sss.pgh.pa.us 461 : 167612 : AssignTransactionId(s);
2595 tmunro@postgresql.or 462 : 17143162 : return XidFromFullTransactionId(s->fullTransactionId);
463 : : }
464 : :
465 : : /*
466 : : * GetCurrentTransactionIdIfAny
467 : : *
468 : : * This will return the XID of the current sub xact, if one is assigned.
469 : : * It will return InvalidTransactionId if we are not currently inside a
470 : : * transaction, or inside a transaction that hasn't been assigned an XID yet.
471 : : */
472 : : TransactionId
6817 tgl@sss.pgh.pa.us 473 : 24709360 : GetCurrentTransactionIdIfAny(void)
474 : : {
2595 tmunro@postgresql.or 475 : 24709360 : return XidFromFullTransactionId(CurrentTransactionState->fullTransactionId);
476 : : }
477 : :
478 : : /*
479 : : * GetTopFullTransactionId
480 : : *
481 : : * This will return the FullTransactionId of the main transaction, assigning
482 : : * one if it's not yet set. Be careful to call this only inside a valid xact.
483 : : */
484 : : FullTransactionId
485 : 3433 : GetTopFullTransactionId(void)
486 : : {
487 [ + + ]: 3433 : if (!FullTransactionIdIsValid(XactTopFullTransactionId))
488 : 2104 : AssignTransactionId(&TopTransactionStateData);
489 : 3433 : return XactTopFullTransactionId;
490 : : }
491 : :
492 : : /*
493 : : * GetTopFullTransactionIdIfAny
494 : : *
495 : : * This will return the FullTransactionId of the main transaction, if one is
496 : : * assigned. It will return InvalidFullTransactionId if we are not currently
497 : : * inside a transaction, or inside a transaction that hasn't yet been assigned
498 : : * one.
499 : : */
500 : : FullTransactionId
501 : 16 : GetTopFullTransactionIdIfAny(void)
502 : : {
503 : 16 : return XactTopFullTransactionId;
504 : : }
505 : :
506 : : /*
507 : : * GetCurrentFullTransactionId
508 : : *
509 : : * This will return the FullTransactionId of the current transaction (main or
510 : : * sub transaction), assigning one if it's not yet set. Be careful to call
511 : : * this only inside a valid xact.
512 : : */
513 : : FullTransactionId
2595 tmunro@postgresql.or 514 :GBC 361 : GetCurrentFullTransactionId(void)
515 : : {
516 : 361 : TransactionState s = CurrentTransactionState;
517 : :
518 [ + + ]: 361 : if (!FullTransactionIdIsValid(s->fullTransactionId))
519 : 14 : AssignTransactionId(s);
520 : 361 : return s->fullTransactionId;
521 : : }
522 : :
523 : : /*
524 : : * GetCurrentFullTransactionIdIfAny
525 : : *
526 : : * This will return the FullTransactionId of the current sub xact, if one is
527 : : * assigned. It will return InvalidFullTransactionId if we are not currently
528 : : * inside a transaction, or inside a transaction that hasn't been assigned one
529 : : * yet.
530 : : */
531 : : FullTransactionId
2595 tmunro@postgresql.or 532 :UBC 0 : GetCurrentFullTransactionIdIfAny(void)
533 : : {
534 : 0 : return CurrentTransactionState->fullTransactionId;
535 : : }
536 : :
537 : : /*
538 : : * MarkCurrentTransactionIdLoggedIfAny
539 : : *
540 : : * Remember that the current xid - if it is assigned - now has been wal logged.
541 : : */
542 : : void
4529 rhaas@postgresql.org 543 :CBC 24657586 : MarkCurrentTransactionIdLoggedIfAny(void)
544 : : {
2595 tmunro@postgresql.or 545 [ + + ]: 24657586 : if (FullTransactionIdIsValid(CurrentTransactionState->fullTransactionId))
4529 rhaas@postgresql.org 546 : 24325342 : CurrentTransactionState->didLogXid = true;
547 : 24657586 : }
548 : :
549 : : /*
550 : : * IsSubxactTopXidLogPending
551 : : *
552 : : * This is used to decide whether we need to WAL log the top-level XID for
553 : : * operation in a subtransaction. We require that for logical decoding, see
554 : : * LogicalDecodingProcessRecord.
555 : : *
556 : : * This returns true if effective_wal_level is logical and we are inside
557 : : * a valid subtransaction, for which the assignment was not yet written to
558 : : * any WAL record.
559 : : */
560 : : bool
1645 akapila@postgresql.o 561 : 24666150 : IsSubxactTopXidLogPending(void)
562 : : {
563 : : /* check whether it is already logged */
564 [ + + ]: 24666150 : if (CurrentTransactionState->topXidLogged)
565 : 102135 : return false;
566 : :
567 : : /* effective_wal_level has to be logical */
568 [ + + + + ]: 24564015 : if (!XLogLogicalInfoActive())
569 : 23951721 : return false;
570 : :
571 : : /* we need to be in a transaction state */
572 [ + + ]: 612294 : if (!IsTransactionState())
573 : 4272 : return false;
574 : :
575 : : /* it has to be a subtransaction */
576 [ + + ]: 608022 : if (!IsSubTransaction())
577 : 607566 : return false;
578 : :
579 : : /* the subtransaction has to have a XID assigned */
580 [ + + ]: 456 : if (!TransactionIdIsValid(GetCurrentTransactionIdIfAny()))
581 : 8 : return false;
582 : :
583 : 448 : return true;
584 : : }
585 : :
586 : : /*
587 : : * MarkSubxactTopXidLogged
588 : : *
589 : : * Remember that the top transaction id for the current subtransaction is WAL
590 : : * logged now.
591 : : */
592 : : void
593 : 223 : MarkSubxactTopXidLogged(void)
594 : : {
595 [ - + ]: 223 : Assert(IsSubxactTopXidLogPending());
596 : :
597 : 223 : CurrentTransactionState->topXidLogged = true;
598 : 223 : }
599 : :
600 : : /*
601 : : * GetStableLatestTransactionId
602 : : *
603 : : * Get the transaction's XID if it has one, else read the next-to-be-assigned
604 : : * XID. Once we have a value, return that same value for the remainder of the
605 : : * current transaction. This is meant to provide the reference point for the
606 : : * age(xid) function, but might be useful for other maintenance tasks as well.
607 : : */
608 : : TransactionId
5107 simon@2ndQuadrant.co 609 : 126 : GetStableLatestTransactionId(void)
610 : : {
611 : : static LocalTransactionId lxid = InvalidLocalTransactionId;
612 : : static TransactionId stablexid = InvalidTransactionId;
613 : :
793 heikki.linnakangas@i 614 [ + + ]: 126 : if (lxid != MyProc->vxid.lxid)
615 : : {
616 : 2 : lxid = MyProc->vxid.lxid;
5106 simon@2ndQuadrant.co 617 : 2 : stablexid = GetTopTransactionIdIfAny();
618 [ + - ]: 2 : if (!TransactionIdIsValid(stablexid))
1905 tmunro@postgresql.or 619 : 2 : stablexid = ReadNextTransactionId();
620 : : }
621 : :
5106 simon@2ndQuadrant.co 622 [ - + ]: 126 : Assert(TransactionIdIsValid(stablexid));
623 : :
5107 624 : 126 : return stablexid;
625 : : }
626 : :
627 : : /*
628 : : * AssignTransactionId
629 : : *
630 : : * Assigns a new permanent FullTransactionId to the given TransactionState.
631 : : * We do not assign XIDs to transactions until/unless this is called.
632 : : * Also, any parent TransactionStates that don't yet have XIDs are assigned
633 : : * one; this maintains the invariant that a child transaction has an XID
634 : : * following its parent's.
635 : : */
636 : : static void
6817 tgl@sss.pgh.pa.us 637 : 171529 : AssignTransactionId(TransactionState s)
638 : : {
6746 bruce@momjian.us 639 : 171529 : bool isSubXact = (s->parent != NULL);
640 : : ResourceOwner currentOwner;
4382 641 : 171529 : bool log_unknown_top = false;
642 : :
643 : : /* Assert that caller didn't screw up */
2595 tmunro@postgresql.or 644 [ - + ]: 171529 : Assert(!FullTransactionIdIsValid(s->fullTransactionId));
7901 tgl@sss.pgh.pa.us 645 [ - + ]: 171529 : Assert(s->state == TRANS_INPROGRESS);
646 : :
647 : : /*
648 : : * Workers synchronize transaction state at the beginning of each parallel
649 : : * operation, so we can't account for new XIDs at this point.
650 : : */
3854 rhaas@postgresql.org 651 [ + - - + ]: 171529 : if (IsInParallelMode() || IsParallelWorker())
768 tgl@sss.pgh.pa.us 652 [ # # ]:UBC 0 : ereport(ERROR,
653 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
654 : : errmsg("cannot assign transaction IDs during a parallel operation")));
655 : :
656 : : /*
657 : : * Ensure parent(s) have XIDs, so that a child always has an XID later
658 : : * than its parent. Mustn't recurse here, or we might get a stack
659 : : * overflow if we're at the bottom of a huge stack of subtransactions none
660 : : * of which have XIDs yet.
661 : : */
2595 tmunro@postgresql.or 662 [ + + + + ]:CBC 171529 : if (isSubXact && !FullTransactionIdIsValid(s->parent->fullTransactionId))
663 : : {
5504 bruce@momjian.us 664 : 628 : TransactionState p = s->parent;
665 : : TransactionState *parents;
666 : 628 : size_t parentOffset = 0;
667 : :
146 michael@paquier.xyz 668 :GNC 628 : parents = palloc_array(TransactionState, s->nestingLevel);
2595 tmunro@postgresql.or 669 [ + + + + ]:CBC 1849 : while (p != NULL && !FullTransactionIdIsValid(p->fullTransactionId))
670 : : {
5765 rhaas@postgresql.org 671 : 1221 : parents[parentOffset++] = p;
672 : 1221 : p = p->parent;
673 : : }
674 : :
675 : : /*
676 : : * This is technically a recursive call, but the recursion will never
677 : : * be more than one layer deep.
678 : : */
679 [ + + ]: 1849 : while (parentOffset != 0)
680 : 1221 : AssignTransactionId(parents[--parentOffset]);
681 : :
682 : 628 : pfree(parents);
683 : : }
684 : :
685 : : /*
686 : : * When effective_wal_level is logical, guarantee that a subtransaction's
687 : : * xid can only be seen in the WAL stream if its toplevel xid has been
688 : : * logged before. If necessary we log an xact_assignment record with fewer
689 : : * than PGPROC_MAX_CACHED_SUBXIDS. Note that it is fine if didLogXid isn't
690 : : * set for a transaction even though it appears in a WAL record, we just
691 : : * might superfluously log something. That can happen when an xid is
692 : : * included somewhere inside a wal record, but not in XLogRecord->xl_xid,
693 : : * like in xl_standby_locks.
694 : : */
4529 695 [ + + + + : 171529 : if (isSubXact && XLogLogicalInfoActive() &&
+ + ]
696 [ + + ]: 304 : !TopTransactionStateData.didLogXid)
697 : 25 : log_unknown_top = true;
698 : :
699 : : /*
700 : : * Generate a new FullTransactionId and record its xid in PGPROC and
701 : : * pg_subtrans.
702 : : *
703 : : * NB: we must make the subtrans entry BEFORE the Xid appears anywhere in
704 : : * shared storage other than PGPROC; because if there's no room for it in
705 : : * PGPROC, the subtrans entry is needed to ensure that other backends see
706 : : * the Xid as "running". See GetNewTransactionId.
707 : : */
2595 tmunro@postgresql.or 708 : 171529 : s->fullTransactionId = GetNewTransactionId(isSubXact);
4023 rhaas@postgresql.org 709 [ + + ]: 171529 : if (!isSubXact)
2595 tmunro@postgresql.or 710 : 165314 : XactTopFullTransactionId = s->fullTransactionId;
711 : :
6817 tgl@sss.pgh.pa.us 712 [ + + ]: 171529 : if (isSubXact)
2595 tmunro@postgresql.or 713 : 6215 : SubTransSetParent(XidFromFullTransactionId(s->fullTransactionId),
714 : 6215 : XidFromFullTransactionId(s->parent->fullTransactionId));
715 : :
716 : : /*
717 : : * If it's a top-level transaction, the predicate locking system needs to
718 : : * be told about it too.
719 : : */
5478 tgl@sss.pgh.pa.us 720 [ + + ]: 171529 : if (!isSubXact)
2595 tmunro@postgresql.or 721 : 165314 : RegisterPredicateLockingXid(XidFromFullTransactionId(s->fullTransactionId));
722 : :
723 : : /*
724 : : * Acquire lock on the transaction XID. (We assume this cannot block.) We
725 : : * have to ensure that the lock is assigned to the transaction's own
726 : : * ResourceOwner.
727 : : */
7901 tgl@sss.pgh.pa.us 728 : 171529 : currentOwner = CurrentResourceOwner;
3128 729 : 171529 : CurrentResourceOwner = s->curTransactionOwner;
730 : :
2595 tmunro@postgresql.or 731 : 171529 : XactLockTableInsert(XidFromFullTransactionId(s->fullTransactionId));
732 : :
7901 tgl@sss.pgh.pa.us 733 : 171529 : CurrentResourceOwner = currentOwner;
734 : :
735 : : /*
736 : : * Every PGPROC_MAX_CACHED_SUBXIDS assigned transaction ids within each
737 : : * top-level transaction we issue a WAL record for the assignment. We
738 : : * include the top-level xid and all the subxids that have not yet been
739 : : * reported using XLOG_XACT_ASSIGNMENT records.
740 : : *
741 : : * This is required to limit the amount of shared memory required in a hot
742 : : * standby server to keep track of in-progress XIDs. See notes for
743 : : * RecordKnownAssignedTransactionIds().
744 : : *
745 : : * We don't keep track of the immediate parent of each subxid, only the
746 : : * top-level transaction that each subxact belongs to. This is correct in
747 : : * recovery only because aborted subtransactions are separately WAL
748 : : * logged.
749 : : *
750 : : * This is correct even for the case where several levels above us didn't
751 : : * have an xid assigned as we recursed up to them beforehand.
752 : : */
5981 simon@2ndQuadrant.co 753 [ + + + + ]: 171529 : if (isSubXact && XLogStandbyInfoActive())
754 : : {
2595 tmunro@postgresql.or 755 : 5928 : unreportedXids[nUnreportedXids] = XidFromFullTransactionId(s->fullTransactionId);
5981 simon@2ndQuadrant.co 756 : 5928 : nUnreportedXids++;
757 : :
758 : : /*
759 : : * ensure this test matches similar one in
760 : : * RecoverPreparedTransactions()
761 : : */
4529 rhaas@postgresql.org 762 [ + + + + ]: 5928 : if (nUnreportedXids >= PGPROC_MAX_CACHED_SUBXIDS ||
763 : : log_unknown_top)
764 : : {
765 : : xl_xact_assignment xlrec;
766 : :
767 : : /*
768 : : * xtop is always set by now because we recurse up transaction
769 : : * stack to the highest unassigned xid and then come back down
770 : : */
5981 simon@2ndQuadrant.co 771 : 94 : xlrec.xtop = GetTopTransactionId();
772 [ - + ]: 94 : Assert(TransactionIdIsValid(xlrec.xtop));
773 : 94 : xlrec.nsubxacts = nUnreportedXids;
774 : :
4184 heikki.linnakangas@i 775 : 94 : XLogBeginInsert();
448 peter@eisentraut.org 776 : 94 : XLogRegisterData(&xlrec, MinSizeOfXactAssignment);
777 : 94 : XLogRegisterData(unreportedXids,
778 : : nUnreportedXids * sizeof(TransactionId));
779 : :
4184 heikki.linnakangas@i 780 : 94 : (void) XLogInsert(RM_XACT_ID, XLOG_XACT_ASSIGNMENT);
781 : :
5981 simon@2ndQuadrant.co 782 : 94 : nUnreportedXids = 0;
783 : : /* mark top, not current xact as having been logged */
4529 rhaas@postgresql.org 784 : 94 : TopTransactionStateData.didLogXid = true;
785 : : }
786 : : }
5981 simon@2ndQuadrant.co 787 : 171529 : }
788 : :
789 : : /*
790 : : * GetCurrentSubTransactionId
791 : : */
792 : : SubTransactionId
7901 tgl@sss.pgh.pa.us 793 : 1993347 : GetCurrentSubTransactionId(void)
794 : : {
795 : 1993347 : TransactionState s = CurrentTransactionState;
796 : :
797 : 1993347 : return s->subTransactionId;
798 : : }
799 : :
800 : : /*
801 : : * SubTransactionIsActive
802 : : *
803 : : * Test if the specified subxact ID is still active. Note caller is
804 : : * responsible for checking whether this ID is relevant to the current xact.
805 : : */
806 : : bool
4811 tgl@sss.pgh.pa.us 807 :UBC 0 : SubTransactionIsActive(SubTransactionId subxid)
808 : : {
809 : : TransactionState s;
810 : :
811 [ # # ]: 0 : for (s = CurrentTransactionState; s != NULL; s = s->parent)
812 : : {
813 [ # # ]: 0 : if (s->state == TRANS_ABORT)
814 : 0 : continue;
815 [ # # ]: 0 : if (s->subTransactionId == subxid)
816 : 0 : return true;
817 : : }
818 : 0 : return false;
819 : : }
820 : :
821 : :
822 : : /*
823 : : * GetCurrentCommandId
824 : : *
825 : : * "used" must be true if the caller intends to use the command ID to mark
826 : : * inserted/updated/deleted tuples. false means the ID is being fetched
827 : : * for read-only purposes (ie, as a snapshot validity cutoff). See
828 : : * CommandCounterIncrement() for discussion.
829 : : */
830 : : CommandId
6731 tgl@sss.pgh.pa.us 831 :CBC 7360506 : GetCurrentCommandId(bool used)
832 : : {
833 : : /* this is global to a transaction, not subtransaction-local */
834 [ + + ]: 7360506 : if (used)
835 : : {
836 : : /*
837 : : * Forbid setting currentCommandIdUsed in a parallel worker, because
838 : : * we have no provision for communicating this back to the leader. We
839 : : * could relax this restriction when currentCommandIdUsed was already
840 : : * true at the start of the parallel operation.
841 : : */
768 842 [ - + ]: 4338535 : if (IsParallelWorker())
768 tgl@sss.pgh.pa.us 843 [ # # ]:UBC 0 : ereport(ERROR,
844 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
845 : : errmsg("cannot modify data in a parallel worker")));
846 : :
6731 tgl@sss.pgh.pa.us 847 :CBC 4338535 : currentCommandIdUsed = true;
848 : : }
7901 849 : 7360506 : return currentCommandId;
850 : : }
851 : :
852 : : /*
853 : : * SetParallelStartTimestamps
854 : : *
855 : : * In a parallel worker, we should inherit the parent transaction's
856 : : * timestamps rather than setting our own. The parallel worker
857 : : * infrastructure must call this to provide those values before
858 : : * calling StartTransaction() or SetCurrentStatementStartTimestamp().
859 : : */
860 : : void
2768 861 : 2008 : SetParallelStartTimestamps(TimestampTz xact_ts, TimestampTz stmt_ts)
862 : : {
863 [ - + ]: 2008 : Assert(IsParallelWorker());
864 : 2008 : xactStartTimestamp = xact_ts;
865 : 2008 : stmtStartTimestamp = stmt_ts;
866 : 2008 : }
867 : :
868 : : /*
869 : : * GetCurrentTransactionStartTimestamp
870 : : */
871 : : TimestampTz
7615 872 : 45368 : GetCurrentTransactionStartTimestamp(void)
873 : : {
874 : 45368 : return xactStartTimestamp;
875 : : }
876 : :
877 : : /*
878 : : * GetCurrentStatementStartTimestamp
879 : : */
880 : : TimestampTz
7315 bruce@momjian.us 881 : 1403914 : GetCurrentStatementStartTimestamp(void)
882 : : {
883 : 1403914 : return stmtStartTimestamp;
884 : : }
885 : :
886 : : /*
887 : : * GetCurrentTransactionStopTimestamp
888 : : *
889 : : * If the transaction stop time hasn't already been set, which can happen if
890 : : * we decided we don't need to log an XLOG record, set xactStopTimestamp.
891 : : */
892 : : TimestampTz
6945 tgl@sss.pgh.pa.us 893 : 1277502 : GetCurrentTransactionStopTimestamp(void)
894 : : {
1299 andres@anarazel.de 895 : 1277502 : TransactionState s PG_USED_FOR_ASSERTS_ONLY = CurrentTransactionState;
896 : :
897 : : /* should only be called after commit / abort processing */
898 [ + + + + : 1277502 : Assert(s->state == TRANS_DEFAULT ||
- + - - ]
899 : : s->state == TRANS_COMMIT ||
900 : : s->state == TRANS_ABORT ||
901 : : s->state == TRANS_PREPARE);
902 : :
903 [ + + ]: 1277502 : if (xactStopTimestamp == 0)
904 : 373409 : xactStopTimestamp = GetCurrentTimestamp();
905 : :
906 : 1277502 : return xactStopTimestamp;
907 : : }
908 : :
909 : : /*
910 : : * SetCurrentStatementStartTimestamp
911 : : *
912 : : * In a parallel worker, this should already have been provided by a call
913 : : * to SetParallelStartTimestamps().
914 : : */
915 : : void
7315 bruce@momjian.us 916 : 654617 : SetCurrentStatementStartTimestamp(void)
917 : : {
2768 tgl@sss.pgh.pa.us 918 [ + + ]: 654617 : if (!IsParallelWorker())
919 : 652609 : stmtStartTimestamp = GetCurrentTimestamp();
920 : : else
921 [ - + ]: 2008 : Assert(stmtStartTimestamp != 0);
7315 bruce@momjian.us 922 : 654617 : }
923 : :
924 : : /*
925 : : * GetCurrentTransactionNestLevel
926 : : *
927 : : * Note: this will return zero when not inside any transaction, one when
928 : : * inside a top-level transaction, etc.
929 : : */
930 : : int
7978 tgl@sss.pgh.pa.us 931 : 25222412 : GetCurrentTransactionNestLevel(void)
932 : : {
933 : 25222412 : TransactionState s = CurrentTransactionState;
934 : :
935 : 25222412 : return s->nestingLevel;
936 : : }
937 : :
938 : :
939 : : /*
940 : : * TransactionIdIsCurrentTransactionId
941 : : */
942 : : bool
10892 scrappy@hub.org 943 : 86111420 : TransactionIdIsCurrentTransactionId(TransactionId xid)
944 : : {
945 : : TransactionState s;
946 : :
947 : : /*
948 : : * We always say that BootstrapTransactionId is "not my transaction ID"
949 : : * even when it is (ie, during bootstrap). Along with the fact that
950 : : * transam.c always treats BootstrapTransactionId as already committed,
951 : : * this causes the heapam_visibility.c routines to see all tuples as
952 : : * committed, which is what we need during bootstrap. (Bootstrap mode
953 : : * only inserts tuples, it never updates or deletes them, so all tuples
954 : : * can be presumed good immediately.)
955 : : *
956 : : * Likewise, InvalidTransactionId and FrozenTransactionId are certainly
957 : : * not my transaction ID, so we can just return "false" immediately for
958 : : * any non-normal XID.
959 : : */
7121 tgl@sss.pgh.pa.us 960 [ + + ]: 86111420 : if (!TransactionIdIsNormal(xid))
10467 bruce@momjian.us 961 : 737831 : return false;
962 : :
2367 tmunro@postgresql.or 963 [ + + ]: 85373589 : if (TransactionIdEquals(xid, GetTopTransactionIdIfAny()))
964 : 61144679 : return true;
965 : :
966 : : /*
967 : : * In parallel workers, the XIDs we must consider as current are stored in
968 : : * ParallelCurrentXids rather than the transaction-state stack. Note that
969 : : * the XIDs in this array are sorted numerically rather than according to
970 : : * transactionIdPrecedes order.
971 : : */
4023 rhaas@postgresql.org 972 [ + + ]: 24228910 : if (nParallelCurrentXids > 0)
973 : : {
974 : : int low,
975 : : high;
976 : :
977 : 4938205 : low = 0;
978 : 4938205 : high = nParallelCurrentXids - 1;
979 [ + + ]: 19490622 : while (low <= high)
980 : : {
981 : : int middle;
982 : : TransactionId probe;
983 : :
984 : 19359639 : middle = low + (high - low) / 2;
985 : 19359639 : probe = ParallelCurrentXids[middle];
986 [ + + ]: 19359639 : if (probe == xid)
987 : 4807222 : return true;
988 [ + + ]: 14552417 : else if (probe < xid)
989 : 14421459 : low = middle + 1;
990 : : else
991 : 130958 : high = middle - 1;
992 : : }
993 : 130983 : return false;
994 : : }
995 : :
996 : : /*
997 : : * We will return true for the Xid of the current subtransaction, any of
998 : : * its subcommitted children, any of its parents, or any of their
999 : : * previously subcommitted children. However, a transaction being aborted
1000 : : * is no longer "current", even though it may still have an entry on the
1001 : : * state stack.
1002 : : */
7920 tgl@sss.pgh.pa.us 1003 [ + + ]: 38506469 : for (s = CurrentTransactionState; s != NULL; s = s->parent)
1004 : : {
1005 : : int low,
1006 : : high;
1007 : :
1008 [ - + ]: 19373517 : if (s->state == TRANS_ABORT)
7920 tgl@sss.pgh.pa.us 1009 :UBC 0 : continue;
2595 tmunro@postgresql.or 1010 [ + + ]:CBC 19373517 : if (!FullTransactionIdIsValid(s->fullTransactionId))
7901 tgl@sss.pgh.pa.us 1011 : 6331504 : continue; /* it can't have any child XIDs either */
2595 tmunro@postgresql.or 1012 [ + + ]: 13042013 : if (TransactionIdEquals(xid, XidFromFullTransactionId(s->fullTransactionId)))
7978 tgl@sss.pgh.pa.us 1013 : 154693 : return true;
1014 : : /* As the childXids array is ordered, we can use binary search */
6623 1015 : 12887320 : low = 0;
1016 : 12887320 : high = s->nChildXids - 1;
1017 [ + + ]: 12888202 : while (low <= high)
1018 : : {
1019 : : int middle;
1020 : : TransactionId probe;
1021 : :
1022 : 3942 : middle = low + (high - low) / 2;
1023 : 3942 : probe = s->childXids[middle];
1024 [ + + ]: 3942 : if (TransactionIdEquals(probe, xid))
7978 1025 : 3060 : return true;
6623 1026 [ + + ]: 882 : else if (TransactionIdPrecedes(probe, xid))
1027 : 803 : low = middle + 1;
1028 : : else
1029 : 79 : high = middle - 1;
1030 : : }
1031 : : }
1032 : :
7978 1033 : 19132952 : return false;
1034 : : }
1035 : :
1036 : : /*
1037 : : * TransactionStartedDuringRecovery
1038 : : *
1039 : : * Returns true if the current transaction started while recovery was still
1040 : : * in progress. Recovery might have ended since so RecoveryInProgress() might
1041 : : * return false already.
1042 : : */
1043 : : bool
5981 simon@2ndQuadrant.co 1044 : 9212880 : TransactionStartedDuringRecovery(void)
1045 : : {
1046 : 9212880 : return CurrentTransactionState->startedInRecovery;
1047 : : }
1048 : :
1049 : : /*
1050 : : * GetTopReadOnlyTransactionNestLevel
1051 : : *
1052 : : * Note: this will return zero when not inside any transaction or when neither
1053 : : * a top-level transaction nor subtransactions are read-only, one when the
1054 : : * top-level transaction is read-only, two when one level of subtransaction is
1055 : : * read-only, etc.
1056 : : *
1057 : : * Note: subtransactions of the topmost read-only transaction are also
1058 : : * read-only, because they inherit read-only mode from the transaction, and
1059 : : * thus can't change to read-write mode (see check_transaction_read_only).
1060 : : */
1061 : : int
30 efujita@postgresql.o 1062 :GNC 9 : GetTopReadOnlyTransactionNestLevel(void)
1063 : : {
1064 : 9 : TransactionState s = CurrentTransactionState;
1065 : :
1066 [ - + ]: 9 : if (!XactReadOnly)
30 efujita@postgresql.o 1067 :UNC 0 : return 0;
30 efujita@postgresql.o 1068 [ + + ]:GNC 10 : while (s->nestingLevel > 1)
1069 : : {
1070 [ + + ]: 4 : if (!s->prevXactReadOnly)
1071 : 3 : return s->nestingLevel;
1072 : 1 : s = s->parent;
1073 : : }
1074 : 6 : return s->nestingLevel;
1075 : : }
1076 : :
1077 : : /*
1078 : : * EnterParallelMode
1079 : : */
1080 : : void
4023 rhaas@postgresql.org 1081 :CBC 4672 : EnterParallelMode(void)
1082 : : {
1083 : 4672 : TransactionState s = CurrentTransactionState;
1084 : :
1085 [ - + ]: 4672 : Assert(s->parallelModeLevel >= 0);
1086 : :
1087 : 4672 : ++s->parallelModeLevel;
1088 : 4672 : }
1089 : :
1090 : : /*
1091 : : * ExitParallelMode
1092 : : */
1093 : : void
1094 : 2655 : ExitParallelMode(void)
1095 : : {
1096 : 2655 : TransactionState s = CurrentTransactionState;
1097 : :
1098 [ - + ]: 2655 : Assert(s->parallelModeLevel > 0);
768 tgl@sss.pgh.pa.us 1099 [ + - + - : 2655 : Assert(s->parallelModeLevel > 1 || s->parallelChildXact ||
- + ]
1100 : : !ParallelContextActive());
1101 : :
4023 rhaas@postgresql.org 1102 : 2655 : --s->parallelModeLevel;
1103 : 2655 : }
1104 : :
1105 : : /*
1106 : : * IsInParallelMode
1107 : : *
1108 : : * Are we in a parallel operation, as either the leader or a worker? Check
1109 : : * this to prohibit operations that change backend-local state expected to
1110 : : * match across all workers. Mere caches usually don't require such a
1111 : : * restriction. State modified in a strict push/pop fashion, such as the
1112 : : * active snapshot stack, is often fine.
1113 : : *
1114 : : * We say we are in parallel mode if we are in a subxact of a transaction
1115 : : * that's initiated a parallel operation; for most purposes that context
1116 : : * has all the same restrictions.
1117 : : */
1118 : : bool
1119 : 7413327 : IsInParallelMode(void)
1120 : : {
768 tgl@sss.pgh.pa.us 1121 : 7413327 : TransactionState s = CurrentTransactionState;
1122 : :
1123 [ + + + + ]: 7413327 : return s->parallelModeLevel != 0 || s->parallelChildXact;
1124 : : }
1125 : :
1126 : : /*
1127 : : * CommandCounterIncrement
1128 : : */
1129 : : void
9324 1130 : 1377424 : CommandCounterIncrement(void)
1131 : : {
1132 : : /*
1133 : : * If the current value of the command counter hasn't been "used" to mark
1134 : : * tuples, we need not increment it, since there's no need to distinguish
1135 : : * a read-only command from others. This helps postpone command counter
1136 : : * overflow, and keeps no-op CommandCounterIncrement operations cheap.
1137 : : */
6731 1138 [ + + ]: 1377424 : if (currentCommandIdUsed)
1139 : : {
1140 : : /*
1141 : : * Workers synchronize transaction state at the beginning of each
1142 : : * parallel operation, so we can't account for new commands after that
1143 : : * point.
1144 : : */
3854 rhaas@postgresql.org 1145 [ + - - + ]: 754489 : if (IsInParallelMode() || IsParallelWorker())
768 tgl@sss.pgh.pa.us 1146 [ # # ]:UBC 0 : ereport(ERROR,
1147 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
1148 : : errmsg("cannot start commands during a parallel operation")));
1149 : :
6731 tgl@sss.pgh.pa.us 1150 :CBC 754489 : currentCommandId += 1;
4621 rhaas@postgresql.org 1151 [ - + ]: 754489 : if (currentCommandId == InvalidCommandId)
1152 : : {
6731 tgl@sss.pgh.pa.us 1153 :UBC 0 : currentCommandId -= 1;
1154 [ # # ]: 0 : ereport(ERROR,
1155 : : (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1156 : : errmsg("cannot have more than 2^32-2 commands in a transaction")));
1157 : : }
6731 tgl@sss.pgh.pa.us 1158 :CBC 754489 : currentCommandIdUsed = false;
1159 : :
1160 : : /* Propagate new command ID into static snapshots */
6567 alvherre@alvh.no-ip. 1161 : 754489 : SnapshotSetCommandId(currentCommandId);
1162 : :
1163 : : /*
1164 : : * Make any catalog changes done by the just-completed command visible
1165 : : * in the local syscache. We obviously don't need to do this after a
1166 : : * read-only command. (But see hacks in inval.c to make real sure we
1167 : : * don't think a command that queued inval messages was read-only.)
1168 : : */
5931 tgl@sss.pgh.pa.us 1169 : 754489 : AtCCI_LocalCache();
1170 : : }
10892 scrappy@hub.org 1171 : 1377420 : }
1172 : :
1173 : : /*
1174 : : * ForceSyncCommit
1175 : : *
1176 : : * Interface routine to allow commands to force a synchronous commit of the
1177 : : * current top-level transaction. Currently, two-phase commit does not
1178 : : * persist and restore this variable. So long as all callers use
1179 : : * PreventInTransactionBlock(), that omission has no consequences.
1180 : : */
1181 : : void
6852 tgl@sss.pgh.pa.us 1182 : 567 : ForceSyncCommit(void)
1183 : : {
1184 : 567 : forceSyncCommit = true;
1185 : 567 : }
1186 : :
1187 : :
1188 : : /* ----------------------------------------------------------------
1189 : : * StartTransaction stuff
1190 : : * ----------------------------------------------------------------
1191 : : */
1192 : :
1193 : : /*
1194 : : * AtStart_Cache
1195 : : */
1196 : : static void
9324 1197 : 421848 : AtStart_Cache(void)
1198 : : {
9086 1199 : 421848 : AcceptInvalidationMessages();
10892 scrappy@hub.org 1200 : 421848 : }
1201 : :
1202 : : /*
1203 : : * AtStart_Memory
1204 : : */
1205 : : static void
9324 tgl@sss.pgh.pa.us 1206 : 421848 : AtStart_Memory(void)
1207 : : {
7978 1208 : 421848 : TransactionState s = CurrentTransactionState;
1209 : :
1210 : : /*
1211 : : * Remember the memory context that was active prior to transaction start.
1212 : : */
673 1213 : 421848 : s->priorContext = CurrentMemoryContext;
1214 : :
1215 : : /*
1216 : : * If this is the first time through, create a private context for
1217 : : * AbortTransaction to work in. By reserving some space now, we can
1218 : : * insulate AbortTransaction from out-of-memory scenarios. Like
1219 : : * ErrorContext, we set it up with slow growth rate and a nonzero minimum
1220 : : * size, so that space will be reserved immediately.
1221 : : */
7103 1222 [ + + ]: 421848 : if (TransactionAbortContext == NULL)
1223 : 18451 : TransactionAbortContext =
2762 1224 : 18451 : AllocSetContextCreate(TopMemoryContext,
1225 : : "TransactionAbortContext",
1226 : : 32 * 1024,
1227 : : 32 * 1024,
1228 : : 32 * 1024);
1229 : :
1230 : : /*
1231 : : * Likewise, if this is the first time through, create a top-level context
1232 : : * for transaction-local data. This context will be reset at transaction
1233 : : * end, and then re-used in later transactions.
1234 : : */
673 1235 [ + + ]: 421848 : if (TopTransactionContext == NULL)
1236 : 18451 : TopTransactionContext =
1237 : 18451 : AllocSetContextCreate(TopMemoryContext,
1238 : : "TopTransactionContext",
1239 : : ALLOCSET_DEFAULT_SIZES);
1240 : :
1241 : : /*
1242 : : * In a top-level transaction, CurTransactionContext is the same as
1243 : : * TopTransactionContext.
1244 : : */
7978 1245 : 421848 : CurTransactionContext = TopTransactionContext;
1246 : 421848 : s->curTransactionContext = CurTransactionContext;
1247 : :
1248 : : /* Make the CurTransactionContext active. */
1249 : 421848 : MemoryContextSwitchTo(CurTransactionContext);
10892 scrappy@hub.org 1250 : 421848 : }
1251 : :
1252 : : /*
1253 : : * AtStart_ResourceOwner
1254 : : */
1255 : : static void
7962 tgl@sss.pgh.pa.us 1256 : 421848 : AtStart_ResourceOwner(void)
1257 : : {
1258 : 421848 : TransactionState s = CurrentTransactionState;
1259 : :
1260 : : /*
1261 : : * We shouldn't have a transaction resource owner already.
1262 : : */
1263 [ - + ]: 421848 : Assert(TopTransactionResourceOwner == NULL);
1264 : :
1265 : : /*
1266 : : * Create a toplevel resource owner for the transaction.
1267 : : */
1268 : 421848 : s->curTransactionOwner = ResourceOwnerCreate(NULL, "TopTransaction");
1269 : :
1270 : 421848 : TopTransactionResourceOwner = s->curTransactionOwner;
1271 : 421848 : CurTransactionResourceOwner = s->curTransactionOwner;
1272 : 421848 : CurrentResourceOwner = s->curTransactionOwner;
1273 : 421848 : }
1274 : :
1275 : : /* ----------------------------------------------------------------
1276 : : * StartSubTransaction stuff
1277 : : * ----------------------------------------------------------------
1278 : : */
1279 : :
1280 : : /*
1281 : : * AtSubStart_Memory
1282 : : */
1283 : : static void
7978 1284 : 12646 : AtSubStart_Memory(void)
1285 : : {
1286 : 12646 : TransactionState s = CurrentTransactionState;
1287 : :
1288 [ - + ]: 12646 : Assert(CurTransactionContext != NULL);
1289 : :
1290 : : /*
1291 : : * Remember the context that was active prior to subtransaction start.
1292 : : */
673 1293 : 12646 : s->priorContext = CurrentMemoryContext;
1294 : :
1295 : : /*
1296 : : * Create a CurTransactionContext, which will be used to hold data that
1297 : : * survives subtransaction commit but disappears on subtransaction abort.
1298 : : * We make it a child of the immediate parent's CurTransactionContext.
1299 : : */
7978 1300 : 12646 : CurTransactionContext = AllocSetContextCreate(CurTransactionContext,
1301 : : "CurTransactionContext",
1302 : : ALLOCSET_DEFAULT_SIZES);
1303 : 12646 : s->curTransactionContext = CurTransactionContext;
1304 : :
1305 : : /* Make the CurTransactionContext active. */
1306 : 12646 : MemoryContextSwitchTo(CurTransactionContext);
1307 : 12646 : }
1308 : :
1309 : : /*
1310 : : * AtSubStart_ResourceOwner
1311 : : */
1312 : : static void
7962 1313 : 12646 : AtSubStart_ResourceOwner(void)
1314 : : {
1315 : 12646 : TransactionState s = CurrentTransactionState;
1316 : :
1317 [ - + ]: 12646 : Assert(s->parent != NULL);
1318 : :
1319 : : /*
1320 : : * Create a resource owner for the subtransaction. We make it a child of
1321 : : * the immediate parent's resource owner.
1322 : : */
1323 : 12646 : s->curTransactionOwner =
1324 : 12646 : ResourceOwnerCreate(s->parent->curTransactionOwner,
1325 : : "SubTransaction");
1326 : :
1327 : 12646 : CurTransactionResourceOwner = s->curTransactionOwner;
1328 : 12646 : CurrentResourceOwner = s->curTransactionOwner;
1329 : 12646 : }
1330 : :
1331 : : /* ----------------------------------------------------------------
1332 : : * CommitTransaction stuff
1333 : : * ----------------------------------------------------------------
1334 : : */
1335 : :
1336 : : /*
1337 : : * RecordTransactionCommit
1338 : : *
1339 : : * Returns latest XID among xact and its children, or InvalidTransactionId
1340 : : * if the xact has no XID. (We compute that here just because it's easier.)
1341 : : *
1342 : : * If you change this function, see RecordTransactionCommitPrepared also.
1343 : : */
1344 : : static TransactionId
5930 1345 : 384262 : RecordTransactionCommit(void)
1346 : : {
6817 1347 : 384262 : TransactionId xid = GetTopTransactionIdIfAny();
6746 bruce@momjian.us 1348 : 384262 : bool markXidCommitted = TransactionIdIsValid(xid);
6814 tgl@sss.pgh.pa.us 1349 : 384262 : TransactionId latestXid = InvalidTransactionId;
1350 : : int nrels;
1351 : : RelFileLocator *rels;
1352 : : int nchildren;
1353 : : TransactionId *children;
1490 andres@anarazel.de 1354 : 384262 : int ndroppedstats = 0;
1355 : 384262 : xl_xact_stats_item *droppedstats = NULL;
5744 rhaas@postgresql.org 1356 : 384262 : int nmsgs = 0;
5981 simon@2ndQuadrant.co 1357 : 384262 : SharedInvalidationMessage *invalMessages = NULL;
5744 rhaas@postgresql.org 1358 : 384262 : bool RelcacheInitFileInval = false;
1359 : : bool wrote_xlog;
1360 : :
1361 : : /*
1362 : : * Log pending invalidations for logical decoding of in-progress
1363 : : * transactions. Normally for DDLs, we log this at each command end,
1364 : : * however, for certain cases where we directly update the system table
1365 : : * without a transaction block, the invalidations are not logged till this
1366 : : * time.
1367 : : */
2112 akapila@postgresql.o 1368 [ + + + + ]: 384262 : if (XLogLogicalInfoActive())
1369 : 14417 : LogLogicalInvalidations();
1370 : :
1371 : : /* Get data needed for commit record */
5744 rhaas@postgresql.org 1372 : 384262 : nrels = smgrGetPendingDeletes(true, &rels);
7962 tgl@sss.pgh.pa.us 1373 : 384262 : nchildren = xactGetCommittedChildren(&children);
1490 andres@anarazel.de 1374 : 384262 : ndroppedstats = pgstat_get_transactional_drops(true, &droppedstats);
5744 rhaas@postgresql.org 1375 [ + + ]: 384262 : if (XLogStandbyInfoActive())
1376 : 323926 : nmsgs = xactGetCommittedInvalidationMessages(&invalMessages,
1377 : : &RelcacheInitFileInval);
5063 heikki.linnakangas@i 1378 : 384262 : wrote_xlog = (XactLastRecEnd != 0);
1379 : :
1380 : : /*
1381 : : * If we haven't been assigned an XID yet, we neither can, nor do we want
1382 : : * to write a COMMIT record.
1383 : : */
6817 tgl@sss.pgh.pa.us 1384 [ + + ]: 384262 : if (!markXidCommitted)
1385 : : {
1386 : : /*
1387 : : * We expect that every RelationDropStorage is followed by a catalog
1388 : : * update, and hence XID assignment, so we shouldn't get here with any
1389 : : * pending deletes. Same is true for dropping stats.
1390 : : *
1391 : : * Use a real test not just an Assert to check this, since it's a bit
1392 : : * fragile.
1393 : : */
1490 andres@anarazel.de 1394 [ + - - + ]: 227687 : if (nrels != 0 || ndroppedstats != 0)
6817 tgl@sss.pgh.pa.us 1395 [ # # ]:UBC 0 : elog(ERROR, "cannot commit a transaction that deleted files but has no xid");
1396 : :
1397 : : /* Can't have child XIDs either; AssignTransactionId enforces this */
6817 tgl@sss.pgh.pa.us 1398 [ - + ]:CBC 227687 : Assert(nchildren == 0);
1399 : :
1400 : : /*
1401 : : * Transactions without an assigned xid can contain invalidation
1402 : : * messages. While inplace updates do this, this is not known to be
1403 : : * necessary; see comment at inplace CacheInvalidateHeapTuple().
1404 : : * Extensions might still rely on this capability, and standbys may
1405 : : * need to process those invals. We can't emit a commit record
1406 : : * without an xid, and we don't want to force assigning an xid,
1407 : : * because that'd be problematic for e.g. vacuum. Hence we emit a
1408 : : * bespoke record for the invalidations. We don't want to use that in
1409 : : * case a commit record is emitted, so they happen synchronously with
1410 : : * commits (besides not wanting to emit more WAL records).
1411 : : *
1412 : : * XXX Every known use of this capability is a defect. Since an XID
1413 : : * isn't controlling visibility of the change that prompted invals,
1414 : : * other sessions need the inval even if this transactions aborts.
1415 : : *
1416 : : * ON COMMIT DELETE ROWS does a nontransactional index_build(), which
1417 : : * queues a relcache inval, including in transactions without an xid
1418 : : * that had read the (empty) table. Standbys don't need any ON COMMIT
1419 : : * DELETE ROWS invals, but we've not done the work to withhold them.
1420 : : */
3664 andres@anarazel.de 1421 [ + + ]: 227687 : if (nmsgs != 0)
1422 : : {
1423 : 11932 : LogStandbyInvalidations(nmsgs, invalMessages,
1424 : : RelcacheInitFileInval);
3617 rhaas@postgresql.org 1425 : 11932 : wrote_xlog = true; /* not strictly necessary */
1426 : : }
1427 : :
1428 : : /*
1429 : : * If we didn't create XLOG entries, we're done here; otherwise we
1430 : : * should trigger flushing those entries the same as a commit record
1431 : : * would. This will primarily happen for HOT pruning and the like; we
1432 : : * want these to be flushed to disk in due time.
1433 : : */
5615 1434 [ + + ]: 227687 : if (!wrote_xlog)
6817 tgl@sss.pgh.pa.us 1435 : 202501 : goto cleanup;
1436 : : }
1437 : : else
1438 : : {
1439 : : bool replorigin;
1440 : :
1441 : : /*
1442 : : * Are we using the replication origins feature? Or, in other words,
1443 : : * are we replaying remote actions?
1444 : : */
97 msawada@postgresql.o 1445 [ + + ]:GNC 157645 : replorigin = (replorigin_xact_state.origin != InvalidReplOriginId &&
1446 [ + - ]: 1070 : replorigin_xact_state.origin != DoNotReplicateId);
1447 : :
1448 : : /*
1449 : : * Mark ourselves as within our "commit critical section". This
1450 : : * forces any concurrent checkpoint to wait until we've updated
1451 : : * pg_xact. Without this, it is possible for the checkpoint to set
1452 : : * REDO after the XLOG record but fail to flush the pg_xact update to
1453 : : * disk, leading to loss of the transaction commit if the system
1454 : : * crashes a little later.
1455 : : *
1456 : : * Note: we could, but don't bother to, set this flag in
1457 : : * RecordTransactionAbort. That's because loss of a transaction abort
1458 : : * is noncritical; the presumption would be that it aborted, anyway.
1459 : : *
1460 : : * It's safe to change the delayChkptFlags flag of our own backend
1461 : : * without holding the ProcArrayLock, since we're the only one
1462 : : * modifying it. This makes checkpoint's determination of which xacts
1463 : : * are delaying the checkpoint a bit fuzzy, but it doesn't matter.
1464 : : *
1465 : : * Note, it is important to get the commit timestamp after marking the
1466 : : * transaction in the commit critical section. See
1467 : : * RecordTransactionCommitPrepared.
1468 : : */
286 akapila@postgresql.o 1469 [ - + ]: 156575 : Assert((MyProc->delayChkptFlags & DELAY_CHKPT_IN_COMMIT) == 0);
6817 tgl@sss.pgh.pa.us 1470 :CBC 156575 : START_CRIT_SECTION();
286 akapila@postgresql.o 1471 :GNC 156575 : MyProc->delayChkptFlags |= DELAY_CHKPT_IN_COMMIT;
1472 : :
1473 [ - + ]: 156575 : Assert(xactStopTimestamp == 0);
1474 : :
1475 : : /*
1476 : : * Ensures the DELAY_CHKPT_IN_COMMIT flag write is globally visible
1477 : : * before commit time is written.
1478 : : */
1479 : 156575 : pg_write_barrier();
1480 : :
1481 : : /*
1482 : : * Insert the commit XLOG record.
1483 : : */
1299 andres@anarazel.de 1484 :CBC 156575 : XactLogCommitRecord(GetCurrentTransactionStopTimestamp(),
1485 : : nchildren, children, nrels, rels,
1486 : : ndroppedstats, droppedstats,
1487 : : nmsgs, invalMessages,
1488 : : RelcacheInitFileInval,
1489 : : MyXactFlags,
1490 : : InvalidTransactionId, NULL /* plain commit */ );
1491 : :
3871 alvherre@alvh.no-ip. 1492 [ + + ]: 156575 : if (replorigin)
1493 : : /* Move LSNs forward for this replication origin */
97 msawada@postgresql.o 1494 :GNC 1070 : replorigin_session_advance(replorigin_xact_state.origin_lsn,
1495 : : XactLastRecEnd);
1496 : :
1497 : : /*
1498 : : * Record commit timestamp. The value comes from plain commit
1499 : : * timestamp if there's no replication origin; otherwise, the
1500 : : * timestamp was already set in replorigin_xact_state.origin_timestamp
1501 : : * by replication.
1502 : : *
1503 : : * We don't need to WAL-log anything here, as the commit record
1504 : : * written above already contains the data.
1505 : : */
1506 : :
1507 [ + + + + ]: 156575 : if (!replorigin || replorigin_xact_state.origin_timestamp == 0)
1508 : 155605 : replorigin_xact_state.origin_timestamp = GetCurrentTransactionStopTimestamp();
1509 : :
4171 alvherre@alvh.no-ip. 1510 :CBC 156575 : TransactionTreeSetCommitTsData(xid, nchildren, children,
1511 : : replorigin_xact_state.origin_timestamp,
97 msawada@postgresql.o 1512 :GNC 156575 : replorigin_xact_state.origin);
1513 : : }
1514 : :
1515 : : /*
1516 : : * Check if we want to commit asynchronously. We can allow the XLOG flush
1517 : : * to happen asynchronously if synchronous_commit=off, or if the current
1518 : : * transaction has not performed any WAL-logged operation or didn't assign
1519 : : * an xid. The transaction can end up not writing any WAL, even if it has
1520 : : * an xid, if it only wrote to temporary and/or unlogged tables. It can
1521 : : * end up having written WAL without an xid if it did HOT pruning. In
1522 : : * case of a crash, the loss of such a transaction will be irrelevant;
1523 : : * temp tables will be lost anyway, unlogged tables will be truncated and
1524 : : * HOT pruning will be done again later. (Given the foregoing, you might
1525 : : * think that it would be unnecessary to emit the XLOG record at all in
1526 : : * this case, but we don't currently try to do that. It would certainly
1527 : : * cause problems at least in Hot Standby mode, where the
1528 : : * KnownAssignedXids machinery requires tracking every XID assignment. It
1529 : : * might be OK to skip it only when wal_level < replica, but for now we
1530 : : * don't.)
1531 : : *
1532 : : * However, if we're doing cleanup of any non-temp rels or committing any
1533 : : * command that wanted to force sync commit, then we must flush XLOG
1534 : : * immediately. (We must not allow asynchronous commit if there are any
1535 : : * non-temp tables to be deleted, because we might delete the files before
1536 : : * the COMMIT record is flushed to disk. We do allow asynchronous commit
1537 : : * if all to-be-deleted tables are temporary though, since they are lost
1538 : : * anyway if we crash.)
1539 : : */
4086 andres@anarazel.de 1540 [ + + + + ]:CBC 181761 : if ((wrote_xlog && markXidCommitted &&
1541 [ + + + + ]: 181761 : synchronous_commit > SYNCHRONOUS_COMMIT_OFF) ||
5510 rhaas@postgresql.org 1542 [ + + ]: 32376 : forceSyncCommit || nrels > 0)
1543 : : {
6817 tgl@sss.pgh.pa.us 1544 : 149400 : XLogFlush(XactLastRecEnd);
1545 : :
1546 : : /*
1547 : : * Now we may update the CLOG, if we wrote a COMMIT record above
1548 : : */
1549 [ + - ]: 149400 : if (markXidCommitted)
6406 alvherre@alvh.no-ip. 1550 : 149400 : TransactionIdCommitTree(xid, nchildren, children);
1551 : : }
1552 : : else
1553 : : {
1554 : : /*
1555 : : * Asynchronous commit case:
1556 : : *
1557 : : * This enables possible committed transaction loss in the case of a
1558 : : * postmaster crash because WAL buffers are left unwritten. Ideally we
1559 : : * could issue the WAL write without the fsync, but some
1560 : : * wal_sync_methods do not allow separate write/fsync.
1561 : : *
1562 : : * Report the latest async commit LSN, so that the WAL writer knows to
1563 : : * flush this commit.
1564 : : */
5759 simon@2ndQuadrant.co 1565 : 32361 : XLogSetAsyncXactLSN(XactLastRecEnd);
1566 : :
1567 : : /*
1568 : : * We must not immediately update the CLOG, since we didn't flush the
1569 : : * XLOG. Instead, we store the LSN up to which the XLOG must be
1570 : : * flushed before the CLOG may be updated.
1571 : : */
6817 tgl@sss.pgh.pa.us 1572 [ + + ]: 32361 : if (markXidCommitted)
6406 alvherre@alvh.no-ip. 1573 : 7175 : TransactionIdAsyncCommitTree(xid, nchildren, children, XactLastRecEnd);
1574 : : }
1575 : :
1576 : : /*
1577 : : * If we entered a commit critical section, leave it now, and let
1578 : : * checkpoints proceed.
1579 : : */
6817 tgl@sss.pgh.pa.us 1580 [ + + ]: 181761 : if (markXidCommitted)
1581 : : {
286 akapila@postgresql.o 1582 :GNC 156575 : MyProc->delayChkptFlags &= ~DELAY_CHKPT_IN_COMMIT;
9244 tgl@sss.pgh.pa.us 1583 [ - + ]:CBC 156575 : END_CRIT_SECTION();
1584 : : }
1585 : :
1586 : : /* Compute latestXid while we have the child XIDs handy */
6814 1587 : 181761 : latestXid = TransactionIdLatest(xid, nchildren, children);
1588 : :
1589 : : /*
1590 : : * Wait for synchronous replication, if required. Similar to the decision
1591 : : * above about using committing asynchronously we only want to wait if
1592 : : * this backend assigned an xid and wrote WAL. No need to wait if an xid
1593 : : * was assigned due to temporary/unlogged tables or due to HOT pruning.
1594 : : *
1595 : : * Note that at this stage we have marked clog, but still show as running
1596 : : * in the procarray and continue to hold locks.
1597 : : */
4086 andres@anarazel.de 1598 [ + + + + ]: 181761 : if (wrote_xlog && markXidCommitted)
3689 rhaas@postgresql.org 1599 : 151870 : SyncRepWaitForLSN(XactLastRecEnd, true);
1600 : :
1601 : : /* remember end of last commit record */
4024 andres@anarazel.de 1602 : 181761 : XactLastCommitEnd = XactLastRecEnd;
1603 : :
1604 : : /* Reset XactLastRecEnd until the next transaction writes something */
5063 heikki.linnakangas@i 1605 : 181761 : XactLastRecEnd = 0;
6817 tgl@sss.pgh.pa.us 1606 : 384262 : cleanup:
1607 : : /* Clean up local data */
7627 1608 [ + + ]: 384262 : if (rels)
1609 : 12501 : pfree(rels);
1490 andres@anarazel.de 1610 [ + + ]: 384262 : if (ndroppedstats)
1611 : 14848 : pfree(droppedstats);
1612 : :
6814 tgl@sss.pgh.pa.us 1613 : 384262 : return latestXid;
1614 : : }
1615 : :
1616 : :
1617 : : /*
1618 : : * AtCCI_LocalCache
1619 : : */
1620 : : static void
5931 1621 : 754489 : AtCCI_LocalCache(void)
1622 : : {
1623 : : /*
1624 : : * Make any pending relation map changes visible. We must do this before
1625 : : * processing local sinval messages, so that the map changes will get
1626 : : * reflected into the relcache when relcache invals are processed.
1627 : : */
1628 : 754489 : AtCCI_RelationMap();
1629 : :
1630 : : /*
1631 : : * Make catalog changes visible to me for the next command.
1632 : : */
7978 1633 : 754489 : CommandEndInvalidationMessages();
9612 inoue@tpf.co.jp 1634 : 754485 : }
1635 : :
1636 : : /*
1637 : : * AtCommit_Memory
1638 : : */
1639 : : static void
9324 tgl@sss.pgh.pa.us 1640 : 386557 : AtCommit_Memory(void)
1641 : : {
673 1642 : 386557 : TransactionState s = CurrentTransactionState;
1643 : :
1644 : : /*
1645 : : * Return to the memory context that was current before we started the
1646 : : * transaction. (In principle, this could not be any of the contexts we
1647 : : * are about to delete. If it somehow is, assertions in mcxt.c will
1648 : : * complain.)
1649 : : */
1650 : 386557 : MemoryContextSwitchTo(s->priorContext);
1651 : :
1652 : : /*
1653 : : * Release all transaction-local memory. TopTransactionContext survives
1654 : : * but becomes empty; any sub-contexts go away.
1655 : : */
9438 1656 [ - + ]: 386557 : Assert(TopTransactionContext != NULL);
673 1657 : 386557 : MemoryContextReset(TopTransactionContext);
1658 : :
1659 : : /*
1660 : : * Clear these pointers as a pro-forma matter. (Notionally, while
1661 : : * TopTransactionContext still exists, it's currently not associated with
1662 : : * this TransactionState struct.)
1663 : : */
7978 1664 : 386557 : CurTransactionContext = NULL;
673 1665 : 386557 : s->curTransactionContext = NULL;
7978 1666 : 386557 : }
1667 : :
1668 : : /* ----------------------------------------------------------------
1669 : : * CommitSubTransaction stuff
1670 : : * ----------------------------------------------------------------
1671 : : */
1672 : :
1673 : : /*
1674 : : * AtSubCommit_Memory
1675 : : */
1676 : : static void
1677 : 7266 : AtSubCommit_Memory(void)
1678 : : {
1679 : 7266 : TransactionState s = CurrentTransactionState;
1680 : :
1681 [ - + ]: 7266 : Assert(s->parent != NULL);
1682 : :
1683 : : /* Return to parent transaction level's memory context. */
1684 : 7266 : CurTransactionContext = s->parent->curTransactionContext;
1685 : 7266 : MemoryContextSwitchTo(CurTransactionContext);
1686 : :
1687 : : /*
1688 : : * Ordinarily we cannot throw away the child's CurTransactionContext,
1689 : : * since the data it contains will be needed at upper commit. However, if
1690 : : * there isn't actually anything in it, we can throw it away. This avoids
1691 : : * a small memory leak in the common case of "trivial" subxacts.
1692 : : */
7901 1693 [ + + ]: 7266 : if (MemoryContextIsEmpty(s->curTransactionContext))
1694 : : {
1695 : 7249 : MemoryContextDelete(s->curTransactionContext);
1696 : 7249 : s->curTransactionContext = NULL;
1697 : : }
7978 1698 : 7266 : }
1699 : :
1700 : : /*
1701 : : * AtSubCommit_childXids
1702 : : *
1703 : : * Pass my own XID and my child XIDs up to my parent as committed children.
1704 : : */
1705 : : static void
1706 : 5360 : AtSubCommit_childXids(void)
1707 : : {
1708 : 5360 : TransactionState s = CurrentTransactionState;
1709 : : int new_nChildXids;
1710 : :
1711 [ - + ]: 5360 : Assert(s->parent != NULL);
1712 : :
1713 : : /*
1714 : : * The parent childXids array will need to hold my XID and all my
1715 : : * childXids, in addition to the XIDs already there.
1716 : : */
6623 1717 : 5360 : new_nChildXids = s->parent->nChildXids + s->nChildXids + 1;
1718 : :
1719 : : /* Allocate or enlarge the parent array if necessary */
1720 [ + + ]: 5360 : if (s->parent->maxChildXids < new_nChildXids)
1721 : : {
1722 : : int new_maxChildXids;
1723 : : TransactionId *new_childXids;
1724 : :
1725 : : /*
1726 : : * Make it 2x what's needed right now, to avoid having to enlarge it
1727 : : * repeatedly. But we can't go above MaxAllocSize. (The latter limit
1728 : : * is what ensures that we don't need to worry about integer overflow
1729 : : * here or in the calculation of new_nChildXids.)
1730 : : */
1731 : 1721 : new_maxChildXids = Min(new_nChildXids * 2,
1732 : : (int) (MaxAllocSize / sizeof(TransactionId)));
1733 : :
1734 [ - + ]: 1721 : if (new_maxChildXids < new_nChildXids)
6623 tgl@sss.pgh.pa.us 1735 [ # # ]:UBC 0 : ereport(ERROR,
1736 : : (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1737 : : errmsg("maximum number of committed subtransactions (%d) exceeded",
1738 : : (int) (MaxAllocSize / sizeof(TransactionId)))));
1739 : :
1740 : : /*
1741 : : * We keep the child-XID arrays in TopTransactionContext; this avoids
1742 : : * setting up child-transaction contexts for what might be just a few
1743 : : * bytes of grandchild XIDs.
1744 : : */
6623 tgl@sss.pgh.pa.us 1745 [ + + ]:CBC 1721 : if (s->parent->childXids == NULL)
1746 : : new_childXids =
6172 bruce@momjian.us 1747 : 1661 : MemoryContextAlloc(TopTransactionContext,
1748 : : new_maxChildXids * sizeof(TransactionId));
1749 : : else
1750 : 60 : new_childXids = repalloc(s->parent->childXids,
1751 : : new_maxChildXids * sizeof(TransactionId));
1752 : :
1753 : 1721 : s->parent->childXids = new_childXids;
6623 tgl@sss.pgh.pa.us 1754 : 1721 : s->parent->maxChildXids = new_maxChildXids;
1755 : : }
1756 : :
1757 : : /*
1758 : : * Copy all my XIDs to parent's array.
1759 : : *
1760 : : * Note: We rely on the fact that the XID of a child always follows that
1761 : : * of its parent. By copying the XID of this subtransaction before the
1762 : : * XIDs of its children, we ensure that the array stays ordered. Likewise,
1763 : : * all XIDs already in the array belong to subtransactions started and
1764 : : * subcommitted before us, so their XIDs must precede ours.
1765 : : */
2595 tmunro@postgresql.or 1766 : 5360 : s->parent->childXids[s->parent->nChildXids] = XidFromFullTransactionId(s->fullTransactionId);
1767 : :
6623 tgl@sss.pgh.pa.us 1768 [ + + ]: 5360 : if (s->nChildXids > 0)
1769 : 1018 : memcpy(&s->parent->childXids[s->parent->nChildXids + 1],
1770 : 1018 : s->childXids,
1771 : 1018 : s->nChildXids * sizeof(TransactionId));
1772 : :
1773 : 5360 : s->parent->nChildXids = new_nChildXids;
1774 : :
1775 : : /* Release child's array to avoid leakage */
1776 [ + + ]: 5360 : if (s->childXids != NULL)
1777 : 1018 : pfree(s->childXids);
1778 : : /* We must reset these to avoid double-free if fail later in commit */
1779 : 5360 : s->childXids = NULL;
1780 : 5360 : s->nChildXids = 0;
1781 : 5360 : s->maxChildXids = 0;
7978 1782 : 5360 : }
1783 : :
1784 : : /* ----------------------------------------------------------------
1785 : : * AbortTransaction stuff
1786 : : * ----------------------------------------------------------------
1787 : : */
1788 : :
1789 : : /*
1790 : : * RecordTransactionAbort
1791 : : *
1792 : : * Returns latest XID among xact and its children, or InvalidTransactionId
1793 : : * if the xact has no XID. (We compute that here just because it's easier.)
1794 : : */
1795 : : static TransactionId
6817 1796 : 40663 : RecordTransactionAbort(bool isSubXact)
1797 : : {
1798 : 40663 : TransactionId xid = GetCurrentTransactionIdIfAny();
1799 : : TransactionId latestXid;
1800 : : int nrels;
1801 : : RelFileLocator *rels;
1490 andres@anarazel.de 1802 : 40663 : int ndroppedstats = 0;
1803 : 40663 : xl_xact_stats_item *droppedstats = NULL;
1804 : : int nchildren;
1805 : : TransactionId *children;
1806 : : TimestampTz xact_time;
1807 : : bool replorigin;
1808 : :
1809 : : /*
1810 : : * If we haven't been assigned an XID, nobody will care whether we aborted
1811 : : * or not. Hence, we're done in that case. It does not matter if we have
1812 : : * rels to delete (note that this routine is not responsible for actually
1813 : : * deleting 'em). We cannot have any child XIDs, either.
1814 : : */
6817 tgl@sss.pgh.pa.us 1815 [ + + ]: 40663 : if (!TransactionIdIsValid(xid))
1816 : : {
1817 : : /* Reset XactLastRecEnd until the next transaction writes something */
1818 [ + + ]: 31364 : if (!isSubXact)
5063 heikki.linnakangas@i 1819 : 26839 : XactLastRecEnd = 0;
6814 tgl@sss.pgh.pa.us 1820 : 31364 : return InvalidTransactionId;
1821 : : }
1822 : :
1823 : : /*
1824 : : * We have a valid XID, so we should write an ABORT record for it.
1825 : : *
1826 : : * We do not flush XLOG to disk here, since the default assumption after a
1827 : : * crash would be that we aborted, anyway. For the same reason, we don't
1828 : : * need to worry about interlocking against checkpoint start.
1829 : : */
1830 : :
1831 : : /*
1832 : : * Check that we haven't aborted halfway through RecordTransactionCommit.
1833 : : */
6817 1834 [ - + ]: 9299 : if (TransactionIdDidCommit(xid))
6817 tgl@sss.pgh.pa.us 1835 [ # # ]:UBC 0 : elog(PANIC, "cannot abort transaction %u, it was already committed",
1836 : : xid);
1837 : :
1838 : : /*
1839 : : * Are we using the replication origins feature? Or, in other words, are
1840 : : * we replaying remote actions?
1841 : : */
97 msawada@postgresql.o 1842 [ + + ]:GNC 9321 : replorigin = (replorigin_xact_state.origin != InvalidReplOriginId &&
1843 [ + - ]: 22 : replorigin_xact_state.origin != DoNotReplicateId);
1844 : :
1845 : : /* Fetch the data we need for the abort record */
5744 rhaas@postgresql.org 1846 :CBC 9299 : nrels = smgrGetPendingDeletes(false, &rels);
6817 tgl@sss.pgh.pa.us 1847 : 9299 : nchildren = xactGetCommittedChildren(&children);
1490 andres@anarazel.de 1848 : 9299 : ndroppedstats = pgstat_get_transactional_drops(false, &droppedstats);
1849 : :
1850 : : /* XXX do we really need a critical section here? */
6817 tgl@sss.pgh.pa.us 1851 : 9299 : START_CRIT_SECTION();
1852 : :
1853 : : /* Write the ABORT record */
1854 [ + + ]: 9299 : if (isSubXact)
4069 andres@anarazel.de 1855 : 855 : xact_time = GetCurrentTimestamp();
1856 : : else
1857 : : {
1299 1858 : 8444 : xact_time = GetCurrentTransactionStopTimestamp();
1859 : : }
1860 : :
4069 1861 : 9299 : XactLogAbortRecord(xact_time,
1862 : : nchildren, children,
1863 : : nrels, rels,
1864 : : ndroppedstats, droppedstats,
1865 : : MyXactFlags, InvalidTransactionId,
1866 : : NULL);
1867 : :
1212 akapila@postgresql.o 1868 [ + + ]: 9299 : if (replorigin)
1869 : : /* Move LSNs forward for this replication origin */
97 msawada@postgresql.o 1870 :GNC 22 : replorigin_session_advance(replorigin_xact_state.origin_lsn,
1871 : : XactLastRecEnd);
1872 : :
1873 : : /*
1874 : : * Report the latest async abort LSN, so that the WAL writer knows to
1875 : : * flush this abort. There's nothing to be gained by delaying this, since
1876 : : * WALWriter may as well do this when it can. This is important with
1877 : : * streaming replication because if we don't flush WAL regularly we will
1878 : : * find that large aborts leave us with a long backlog for when commits
1879 : : * occur after the abort, increasing our window of data loss should
1880 : : * problems occur at that point.
1881 : : */
5836 simon@2ndQuadrant.co 1882 [ + + ]:CBC 9299 : if (!isSubXact)
5759 1883 : 8444 : XLogSetAsyncXactLSN(XactLastRecEnd);
1884 : :
1885 : : /*
1886 : : * Mark the transaction aborted in clog. This is not absolutely necessary
1887 : : * but we may as well do it while we are here; also, in the subxact case
1888 : : * it is helpful because XactLockTableWait makes use of it to avoid
1889 : : * waiting for already-aborted subtransactions. It is OK to do it without
1890 : : * having flushed the ABORT record to disk, because in event of a crash
1891 : : * we'd be assumed to have aborted anyway.
1892 : : */
6406 alvherre@alvh.no-ip. 1893 : 9299 : TransactionIdAbortTree(xid, nchildren, children);
1894 : :
6817 tgl@sss.pgh.pa.us 1895 [ - + ]: 9299 : END_CRIT_SECTION();
1896 : :
1897 : : /* Compute latestXid while we have the child XIDs handy */
6814 1898 : 9299 : latestXid = TransactionIdLatest(xid, nchildren, children);
1899 : :
1900 : : /*
1901 : : * If we're aborting a subtransaction, we can immediately remove failed
1902 : : * XIDs from PGPROC's cache of running child XIDs. We do that here for
1903 : : * subxacts, because we already have the child XID array at hand. For
1904 : : * main xacts, the equivalent happens just after this function returns.
1905 : : */
6817 1906 [ + + ]: 9299 : if (isSubXact)
6814 1907 : 855 : XidCacheRemoveRunningXids(xid, nchildren, children, latestXid);
1908 : :
1909 : : /* Reset XactLastRecEnd until the next transaction writes something */
6817 1910 [ + + ]: 9299 : if (!isSubXact)
5063 heikki.linnakangas@i 1911 : 8444 : XactLastRecEnd = 0;
1912 : :
1913 : : /* And clean up local data */
7627 tgl@sss.pgh.pa.us 1914 [ + + ]: 9299 : if (rels)
1915 : 1363 : pfree(rels);
1490 andres@anarazel.de 1916 [ + + ]: 9299 : if (ndroppedstats)
1917 : 1942 : pfree(droppedstats);
1918 : :
6814 tgl@sss.pgh.pa.us 1919 : 9299 : return latestXid;
1920 : : }
1921 : :
1922 : : /*
1923 : : * AtAbort_Memory
1924 : : */
1925 : : static void
9324 1926 : 54282 : AtAbort_Memory(void)
1927 : : {
1928 : : /*
1929 : : * Switch into TransactionAbortContext, which should have some free space
1930 : : * even if nothing else does. We'll work in this context until we've
1931 : : * finished cleaning up.
1932 : : *
1933 : : * It is barely possible to get here when we've not been able to create
1934 : : * TransactionAbortContext yet; if so use TopMemoryContext.
1935 : : */
7103 1936 [ + - ]: 54282 : if (TransactionAbortContext != NULL)
1937 : 54282 : MemoryContextSwitchTo(TransactionAbortContext);
1938 : : else
9438 tgl@sss.pgh.pa.us 1939 :UBC 0 : MemoryContextSwitchTo(TopMemoryContext);
9442 tgl@sss.pgh.pa.us 1940 :CBC 54282 : }
1941 : :
1942 : : /*
1943 : : * AtSubAbort_Memory
1944 : : */
1945 : : static void
7978 1946 : 5380 : AtSubAbort_Memory(void)
1947 : : {
7103 1948 [ - + ]: 5380 : Assert(TransactionAbortContext != NULL);
1949 : :
1950 : 5380 : MemoryContextSwitchTo(TransactionAbortContext);
7978 1951 : 5380 : }
1952 : :
1953 : :
1954 : : /*
1955 : : * AtAbort_ResourceOwner
1956 : : */
1957 : : static void
7883 1958 : 35291 : AtAbort_ResourceOwner(void)
1959 : : {
1960 : : /*
1961 : : * Make sure we have a valid ResourceOwner, if possible (else it will be
1962 : : * NULL, which is OK)
1963 : : */
1964 : 35291 : CurrentResourceOwner = TopTransactionResourceOwner;
1965 : 35291 : }
1966 : :
1967 : : /*
1968 : : * AtSubAbort_ResourceOwner
1969 : : */
1970 : : static void
1971 : 5380 : AtSubAbort_ResourceOwner(void)
1972 : : {
1973 : 5380 : TransactionState s = CurrentTransactionState;
1974 : :
1975 : : /* Make sure we have a valid ResourceOwner */
1976 : 5380 : CurrentResourceOwner = s->curTransactionOwner;
1977 : 5380 : }
1978 : :
1979 : :
1980 : : /*
1981 : : * AtSubAbort_childXids
1982 : : */
1983 : : static void
7901 1984 : 855 : AtSubAbort_childXids(void)
1985 : : {
1986 : 855 : TransactionState s = CurrentTransactionState;
1987 : :
1988 : : /*
1989 : : * We keep the child-XID arrays in TopTransactionContext (see
1990 : : * AtSubCommit_childXids). This means we'd better free the array
1991 : : * explicitly at abort to avoid leakage.
1992 : : */
6623 1993 [ + + ]: 855 : if (s->childXids != NULL)
1994 : 26 : pfree(s->childXids);
1995 : 855 : s->childXids = NULL;
1996 : 855 : s->nChildXids = 0;
1997 : 855 : s->maxChildXids = 0;
1998 : :
1999 : : /*
2000 : : * We could prune the unreportedXids array here. But we don't bother. That
2001 : : * would potentially reduce number of XLOG_XACT_ASSIGNMENT records but it
2002 : : * would likely introduce more CPU time into the more common paths, so we
2003 : : * choose not to do that.
2004 : : */
7901 2005 : 855 : }
2006 : :
2007 : : /* ----------------------------------------------------------------
2008 : : * CleanupTransaction stuff
2009 : : * ----------------------------------------------------------------
2010 : : */
2011 : :
2012 : : /*
2013 : : * AtCleanup_Memory
2014 : : */
2015 : : static void
9324 2016 : 35291 : AtCleanup_Memory(void)
2017 : : {
673 2018 : 35291 : TransactionState s = CurrentTransactionState;
2019 : :
2020 : : /* Should be at top level */
2021 [ - + ]: 35291 : Assert(s->parent == NULL);
2022 : :
2023 : : /*
2024 : : * Return to the memory context that was current before we started the
2025 : : * transaction. (In principle, this could not be any of the contexts we
2026 : : * are about to delete. If it somehow is, assertions in mcxt.c will
2027 : : * complain.)
2028 : : */
2029 : 35291 : MemoryContextSwitchTo(s->priorContext);
2030 : :
2031 : : /*
2032 : : * Clear the special abort context for next time.
2033 : : */
7103 2034 [ + - ]: 35291 : if (TransactionAbortContext != NULL)
902 nathan@postgresql.or 2035 : 35291 : MemoryContextReset(TransactionAbortContext);
2036 : :
2037 : : /*
2038 : : * Release all transaction-local memory, the same as in AtCommit_Memory,
2039 : : * except we must cope with the possibility that we didn't get as far as
2040 : : * creating TopTransactionContext.
2041 : : */
9438 tgl@sss.pgh.pa.us 2042 [ + - ]: 35291 : if (TopTransactionContext != NULL)
673 2043 : 35291 : MemoryContextReset(TopTransactionContext);
2044 : :
2045 : : /*
2046 : : * Clear these pointers as a pro-forma matter. (Notionally, while
2047 : : * TopTransactionContext still exists, it's currently not associated with
2048 : : * this TransactionState struct.)
2049 : : */
7978 2050 : 35291 : CurTransactionContext = NULL;
673 2051 : 35291 : s->curTransactionContext = NULL;
10892 scrappy@hub.org 2052 : 35291 : }
2053 : :
2054 : :
2055 : : /* ----------------------------------------------------------------
2056 : : * CleanupSubTransaction stuff
2057 : : * ----------------------------------------------------------------
2058 : : */
2059 : :
2060 : : /*
2061 : : * AtSubCleanup_Memory
2062 : : */
2063 : : static void
7978 tgl@sss.pgh.pa.us 2064 : 5380 : AtSubCleanup_Memory(void)
2065 : : {
2066 : 5380 : TransactionState s = CurrentTransactionState;
2067 : :
2068 [ - + ]: 5380 : Assert(s->parent != NULL);
2069 : :
2070 : : /*
2071 : : * Return to the memory context that was current before we started the
2072 : : * subtransaction. (In principle, this could not be any of the contexts
2073 : : * we are about to delete. If it somehow is, assertions in mcxt.c will
2074 : : * complain.)
2075 : : */
673 2076 : 5380 : MemoryContextSwitchTo(s->priorContext);
2077 : :
2078 : : /* Update CurTransactionContext (might not be same as priorContext) */
7978 2079 : 5380 : CurTransactionContext = s->parent->curTransactionContext;
2080 : :
2081 : : /*
2082 : : * Clear the special abort context for next time.
2083 : : */
7103 2084 [ + - ]: 5380 : if (TransactionAbortContext != NULL)
902 nathan@postgresql.or 2085 : 5380 : MemoryContextReset(TransactionAbortContext);
2086 : :
2087 : : /*
2088 : : * Delete the subxact local memory contexts. Its CurTransactionContext can
2089 : : * go too (note this also kills CurTransactionContexts from any children
2090 : : * of the subxact).
2091 : : */
7901 tgl@sss.pgh.pa.us 2092 [ + - ]: 5380 : if (s->curTransactionContext)
2093 : 5380 : MemoryContextDelete(s->curTransactionContext);
2094 : 5380 : s->curTransactionContext = NULL;
7978 2095 : 5380 : }
2096 : :
2097 : : /* ----------------------------------------------------------------
2098 : : * interface routines
2099 : : * ----------------------------------------------------------------
2100 : : */
2101 : :
2102 : : /*
2103 : : * StartTransaction
2104 : : */
2105 : : static void
9324 2106 : 421848 : StartTransaction(void)
2107 : : {
2108 : : TransactionState s;
2109 : : VirtualTransactionId vxid;
2110 : :
2111 : : /*
2112 : : * Let's just make sure the state stack is empty
2113 : : */
7901 2114 : 421848 : s = &TopTransactionStateData;
2115 : 421848 : CurrentTransactionState = s;
2116 : :
2595 tmunro@postgresql.or 2117 [ - + ]: 421848 : Assert(!FullTransactionIdIsValid(XactTopFullTransactionId));
2118 : :
2119 : : /* check the current transaction state */
2729 michael@paquier.xyz 2120 [ - + ]: 421848 : Assert(s->state == TRANS_DEFAULT);
2121 : :
2122 : : /*
2123 : : * Set the current transaction state information appropriately during
2124 : : * start processing. Note that once the transaction status is switched
2125 : : * this process cannot fail until the user ID and the security context
2126 : : * flags are fetched below.
2127 : : */
10467 bruce@momjian.us 2128 : 421848 : s->state = TRANS_START;
2595 tmunro@postgresql.or 2129 : 421848 : s->fullTransactionId = InvalidFullTransactionId; /* until assigned */
2130 : :
2131 : : /* Determine if statements are logged in this transaction */
2589 alvherre@alvh.no-ip. 2132 [ - + ]: 421848 : xact_is_sampled = log_xact_sample_rate != 0 &&
2589 alvherre@alvh.no-ip. 2133 [ # # ]:UBC 0 : (log_xact_sample_rate == 1 ||
1619 tgl@sss.pgh.pa.us 2134 [ # # ]: 0 : pg_prng_double(&pg_global_prng_state) <= log_xact_sample_rate);
2135 : :
2136 : : /*
2137 : : * initialize current transaction state fields
2138 : : *
2139 : : * note: prevXactReadOnly is not used at the outermost level
2140 : : */
2729 michael@paquier.xyz 2141 :CBC 421848 : s->nestingLevel = 1;
2142 : 421848 : s->gucNestLevel = 1;
2143 : 421848 : s->childXids = NULL;
2144 : 421848 : s->nChildXids = 0;
2145 : 421848 : s->maxChildXids = 0;
2146 : :
2147 : : /*
2148 : : * Once the current user ID and the security context flags are fetched,
2149 : : * both will be properly reset even if transaction startup fails.
2150 : : */
2151 : 421848 : GetUserIdAndSecContext(&s->prevUser, &s->prevSecContext);
2152 : :
2153 : : /* SecurityRestrictionContext should never be set outside a transaction */
2154 [ - + ]: 421848 : Assert(s->prevSecContext == 0);
2155 : :
2156 : : /*
2157 : : * Make sure we've reset xact state variables
2158 : : *
2159 : : * If recovery is still in progress, mark this transaction as read-only.
2160 : : * We have lower level defences in XLogInsert and elsewhere to stop us
2161 : : * from modifying data during recovery, but this gives the normal
2162 : : * indication to the user that the transaction is read-only.
2163 : : */
5981 simon@2ndQuadrant.co 2164 [ + + ]: 421848 : if (RecoveryInProgress())
2165 : : {
2166 : 2302 : s->startedInRecovery = true;
2167 : 2302 : XactReadOnly = true;
2168 : : }
2169 : : else
2170 : : {
2171 : 419546 : s->startedInRecovery = false;
2172 : 419546 : XactReadOnly = DefaultXactReadOnly;
2173 : : }
5566 heikki.linnakangas@i 2174 : 421848 : XactDeferrable = DefaultXactDeferrable;
8237 tgl@sss.pgh.pa.us 2175 : 421848 : XactIsoLevel = DefaultXactIsoLevel;
6852 2176 : 421848 : forceSyncCommit = false;
3331 simon@2ndQuadrant.co 2177 : 421848 : MyXactFlags = 0;
2178 : :
2179 : : /*
2180 : : * reinitialize within-transaction counters
2181 : : */
7901 tgl@sss.pgh.pa.us 2182 : 421848 : s->subTransactionId = TopSubTransactionId;
2183 : 421848 : currentSubTransactionId = TopSubTransactionId;
2184 : 421848 : currentCommandId = FirstCommandId;
6731 2185 : 421848 : currentCommandIdUsed = false;
2186 : :
2187 : : /*
2188 : : * initialize reported xid accounting
2189 : : */
5981 simon@2ndQuadrant.co 2190 : 421848 : nUnreportedXids = 0;
4529 rhaas@postgresql.org 2191 : 421848 : s->didLogXid = false;
2192 : :
2193 : : /*
2194 : : * must initialize resource-management stuff first
2195 : : */
7962 tgl@sss.pgh.pa.us 2196 : 421848 : AtStart_Memory();
2197 : 421848 : AtStart_ResourceOwner();
2198 : :
2199 : : /*
2200 : : * Assign a new LocalTransactionId, and combine it with the proc number to
2201 : : * form a virtual transaction id.
2202 : : */
793 heikki.linnakangas@i 2203 : 421848 : vxid.procNumber = MyProcNumber;
6817 tgl@sss.pgh.pa.us 2204 : 421848 : vxid.localTransactionId = GetNextLocalTransactionId();
2205 : :
2206 : : /*
2207 : : * Lock the virtual transaction id before we announce it in the proc array
2208 : : */
2209 : 421848 : VirtualXactLockTableInsert(vxid);
2210 : :
2211 : : /*
2212 : : * Advertise it in the proc array. We assume assignment of
2213 : : * localTransactionId is atomic, and the proc number should be set
2214 : : * already.
2215 : : */
793 heikki.linnakangas@i 2216 [ - + ]: 421848 : Assert(MyProc->vxid.procNumber == vxid.procNumber);
2217 : 421848 : MyProc->vxid.lxid = vxid.localTransactionId;
2218 : :
2219 : : TRACE_POSTGRESQL_TRANSACTION_START(vxid.localTransactionId);
2220 : :
2221 : : /*
2222 : : * set transaction_timestamp() (a/k/a now()). Normally, we want this to
2223 : : * be the same as the first command's statement_timestamp(), so don't do a
2224 : : * fresh GetCurrentTimestamp() call (which'd be expensive anyway). But
2225 : : * for transactions started inside procedures (i.e., nonatomic SPI
2226 : : * contexts), we do need to advance the timestamp. Also, in a parallel
2227 : : * worker, the timestamp should already have been provided by a call to
2228 : : * SetParallelStartTimestamps().
2229 : : */
2768 tgl@sss.pgh.pa.us 2230 [ + + ]: 421848 : if (!IsParallelWorker())
2231 : : {
2766 2232 [ + + ]: 415824 : if (!SPI_inside_nonatomic_context())
2233 : 413607 : xactStartTimestamp = stmtStartTimestamp;
2234 : : else
2235 : 2217 : xactStartTimestamp = GetCurrentTimestamp();
2236 : : }
2237 : : else
2768 2238 [ - + ]: 6024 : Assert(xactStartTimestamp != 0);
6811 2239 : 421848 : pgstat_report_xact_timestamp(xactStartTimestamp);
2240 : : /* Mark xactStopTimestamp as unset. */
2766 2241 : 421848 : xactStopTimestamp = 0;
2242 : :
2243 : : /*
2244 : : * initialize other subsystems for new transaction
2245 : : */
6819 2246 : 421848 : AtStart_GUC();
10467 bruce@momjian.us 2247 : 421848 : AtStart_Cache();
7907 tgl@sss.pgh.pa.us 2248 : 421848 : AfterTriggerBeginXact();
2249 : :
2250 : : /*
2251 : : * done with start processing, set current transaction state to "in
2252 : : * progress"
2253 : : */
10467 bruce@momjian.us 2254 : 421848 : s->state = TRANS_INPROGRESS;
2255 : :
2256 : : /* Schedule transaction timeout */
810 akorotkov@postgresql 2257 [ + + ]: 421848 : if (TransactionTimeout > 0)
2258 : 1 : enable_timeout_after(TRANSACTION_TIMEOUT, TransactionTimeout);
2259 : :
7978 tgl@sss.pgh.pa.us 2260 : 421848 : ShowTransactionState("StartTransaction");
10892 scrappy@hub.org 2261 : 421848 : }
2262 : :
2263 : :
2264 : : /*
2265 : : * CommitTransaction
2266 : : *
2267 : : * NB: if you change this routine, better look at PrepareTransaction too!
2268 : : */
2269 : : static void
9324 tgl@sss.pgh.pa.us 2270 : 386529 : CommitTransaction(void)
2271 : : {
10467 bruce@momjian.us 2272 : 386529 : TransactionState s = CurrentTransactionState;
2273 : : TransactionId latestXid;
2274 : : bool is_parallel_worker;
2275 : :
4023 rhaas@postgresql.org 2276 : 386529 : is_parallel_worker = (s->blockState == TBLOCK_PARALLEL_INPROGRESS);
2277 : :
2278 : : /* Enforce parallel mode restrictions during parallel worker commit. */
3854 2279 [ + + ]: 386529 : if (is_parallel_worker)
2280 : 2000 : EnterParallelMode();
2281 : :
7978 tgl@sss.pgh.pa.us 2282 : 386529 : ShowTransactionState("CommitTransaction");
2283 : :
2284 : : /*
2285 : : * check the current transaction state
2286 : : */
10467 bruce@momjian.us 2287 [ - + ]: 386529 : if (s->state != TRANS_INPROGRESS)
7951 tgl@sss.pgh.pa.us 2288 [ # # ]:UBC 0 : elog(WARNING, "CommitTransaction while in %s state",
2289 : : TransStateAsString(s->state));
7978 tgl@sss.pgh.pa.us 2290 [ + - ]:CBC 386529 : Assert(s->parent == NULL);
2291 : :
2292 : : /*
2293 : : * Do pre-commit processing that involves calling user-defined code, such
2294 : : * as triggers. SECURITY_RESTRICTED_OPERATION contexts must not queue an
2295 : : * action that would run here, because that would bypass the sandbox.
2296 : : * Since closing cursors could queue trigger actions, triggers could open
2297 : : * cursors, etc, we have to keep looping until there's nothing left to do.
2298 : : */
2299 : : for (;;)
2300 : : {
2301 : : /*
2302 : : * Fire all currently pending deferred triggers.
2303 : : */
7694 2304 : 391928 : AfterTriggerFireDeferred();
2305 : :
2306 : : /*
2307 : : * Close open portals (converting holdable ones into static portals).
2308 : : * If there weren't any, we are done ... otherwise loop back to check
2309 : : * if they queued deferred triggers. Lather, rinse, repeat.
2310 : : */
5546 2311 [ + + ]: 391820 : if (!PreCommit_Portals(false))
7694 2312 : 386421 : break;
2313 : : }
2314 : :
2315 : : /*
2316 : : * The remaining actions cannot call any user-defined code, so it's safe
2317 : : * to start shutting down within-transaction services. But note that most
2318 : : * of this stuff could still throw an error, which would switch us into
2319 : : * the transaction-abort path.
2320 : : */
2321 : :
2003 noah@leadboat.com 2322 [ + + ]: 386421 : CallXactCallbacks(is_parallel_worker ? XACT_EVENT_PARALLEL_PRE_COMMIT
2323 : : : XACT_EVENT_PRE_COMMIT);
2324 : :
2325 : : /*
2326 : : * If this xact has started any unfinished parallel operation, clean up
2327 : : * its workers, warning about leaked resources. (But we don't actually
2328 : : * reset parallelModeLevel till entering TRANS_COMMIT, a bit below. This
2329 : : * keeps parallel mode restrictions active as long as possible in a
2330 : : * parallel worker.)
2331 : : */
768 tgl@sss.pgh.pa.us 2332 : 386421 : AtEOXact_Parallel(true);
2333 [ + + ]: 386421 : if (is_parallel_worker)
2334 : : {
2335 [ - + ]: 2000 : if (s->parallelModeLevel != 1)
768 tgl@sss.pgh.pa.us 2336 [ # # ]:UBC 0 : elog(WARNING, "parallelModeLevel is %d not 1 at end of parallel worker transaction",
2337 : : s->parallelModeLevel);
2338 : : }
2339 : : else
2340 : : {
768 tgl@sss.pgh.pa.us 2341 [ - + ]:CBC 384421 : if (s->parallelModeLevel != 0)
768 tgl@sss.pgh.pa.us 2342 [ # # ]:UBC 0 : elog(WARNING, "parallelModeLevel is %d not 0 at end of transaction",
2343 : : s->parallelModeLevel);
2344 : : }
2345 : :
2346 : : /* Shut down the deferred-trigger manager */
5546 tgl@sss.pgh.pa.us 2347 :CBC 386421 : AfterTriggerEndXact(true);
2348 : :
2349 : : /*
2350 : : * Let ON COMMIT management do its thing (must happen after closing
2351 : : * cursors, to avoid dangling-reference problems)
2352 : : */
7858 2353 : 386421 : PreCommit_on_commit_actions();
2354 : :
2355 : : /*
2356 : : * Synchronize files that are created and not WAL-logged during this
2357 : : * transaction. This must happen before AtEOXact_RelationMap(), so that we
2358 : : * don't see committed-but-broken files after a crash.
2359 : : */
2222 noah@leadboat.com 2360 : 386417 : smgrDoPendingSyncs(true, is_parallel_worker);
2361 : :
2362 : : /* close large objects before lower-level cleanup */
7951 tgl@sss.pgh.pa.us 2363 : 386417 : AtEOXact_LargeObject(true);
2364 : :
2365 : : /*
2366 : : * Insert notifications sent by NOTIFY commands into the queue. This
2367 : : * should be late in the pre-commit sequence to minimize time spent
2368 : : * holding the notify-insertion lock. However, this could result in
2369 : : * creating a snapshot, so we must do it before serializable cleanup.
2370 : : */
2354 2371 : 386417 : PreCommit_Notify();
2372 : :
2373 : : /*
2374 : : * Mark serializable transaction as complete for predicate locking
2375 : : * purposes. This should be done as late as we can put it and still allow
2376 : : * errors to be raised for failure patterns found at commit. This is not
2377 : : * appropriate in a parallel worker however, because we aren't committing
2378 : : * the leader's transaction and its serializable state will live on.
2379 : : */
2608 tmunro@postgresql.or 2380 [ + + ]: 386417 : if (!is_parallel_worker)
2381 : 384417 : PreCommit_CheckForSerializationFailure();
2382 : :
2383 : : /* Prevent cancel/die interrupt while cleaning up */
7858 tgl@sss.pgh.pa.us 2384 : 386262 : HOLD_INTERRUPTS();
2385 : :
2386 : : /* Commit updates to the relation map --- do this as late as possible */
2825 pg@bowt.ie 2387 : 386262 : AtEOXact_RelationMap(true, is_parallel_worker);
2388 : :
2389 : : /*
2390 : : * set the current transaction state information appropriately during
2391 : : * commit processing
2392 : : */
7858 tgl@sss.pgh.pa.us 2393 : 386262 : s->state = TRANS_COMMIT;
3854 rhaas@postgresql.org 2394 : 386262 : s->parallelModeLevel = 0;
768 tgl@sss.pgh.pa.us 2395 : 386262 : s->parallelChildXact = false; /* should be false already */
2396 : :
2397 : : /* Disable transaction timeout */
809 akorotkov@postgresql 2398 [ + + ]: 386262 : if (TransactionTimeout > 0)
2399 : 1 : disable_timeout(TRANSACTION_TIMEOUT, false);
2400 : :
4023 rhaas@postgresql.org 2401 [ + + ]: 386262 : if (!is_parallel_worker)
2402 : : {
2403 : : /*
2404 : : * We need to mark our XIDs as committed in pg_xact. This is where we
2405 : : * durably commit.
2406 : : */
2407 : 384262 : latestXid = RecordTransactionCommit();
2408 : : }
2409 : : else
2410 : : {
2411 : : /*
2412 : : * We must not mark our XID committed; the parallel leader is
2413 : : * responsible for that.
2414 : : */
2415 : 2000 : latestXid = InvalidTransactionId;
2416 : :
2417 : : /*
2418 : : * Make sure the leader will know about any WAL we wrote before it
2419 : : * commits.
2420 : : */
2421 : 2000 : ParallelWorkerReportLastRecEnd(XactLastRecEnd);
2422 : : }
2423 : :
2424 : : TRACE_POSTGRESQL_TRANSACTION_COMMIT(MyProc->vxid.lxid);
2425 : :
2426 : : /*
2427 : : * Let others know about no transaction in progress by me. Note that this
2428 : : * must be done _before_ releasing locks we hold and _after_
2429 : : * RecordTransactionCommit.
2430 : : */
6814 tgl@sss.pgh.pa.us 2431 : 386262 : ProcArrayEndTransaction(MyProc, latestXid);
2432 : :
2433 : : /*
2434 : : * This is all post-commit cleanup. Note that if an error is raised here,
2435 : : * it's too late to abort the transaction. This should be just
2436 : : * noncritical resource releasing.
2437 : : *
2438 : : * The ordering of operations is not entirely random. The idea is:
2439 : : * release resources visible to other backends (eg, files, buffer pins);
2440 : : * then release locks; then release backend-local resources. We want to
2441 : : * release locks at the point where any backend waiting for us will see
2442 : : * our transaction as being fully cleaned up.
2443 : : *
2444 : : * Resources that can be associated with individual queries are handled by
2445 : : * the ResourceOwner mechanism. The other calls here are for backend-wide
2446 : : * state.
2447 : : */
2448 : :
4023 rhaas@postgresql.org 2449 : 386262 : CallXactCallbacks(is_parallel_worker ? XACT_EVENT_PARALLEL_COMMIT
2450 : : : XACT_EVENT_COMMIT);
2451 : :
902 heikki.linnakangas@i 2452 : 386262 : CurrentResourceOwner = NULL;
7962 tgl@sss.pgh.pa.us 2453 : 386262 : ResourceOwnerRelease(TopTransactionResourceOwner,
2454 : : RESOURCE_RELEASE_BEFORE_LOCKS,
2455 : : true, true);
2456 : :
414 andres@anarazel.de 2457 : 386262 : AtEOXact_Aio(true);
2458 : :
2459 : : /* Check we've released all buffer pins */
7871 tgl@sss.pgh.pa.us 2460 : 386262 : AtEOXact_Buffers(true);
2461 : :
2462 : : /* Clean up the relation cache */
7575 2463 : 386262 : AtEOXact_RelationCache(true);
2464 : :
2465 : : /* Clean up the type cache */
558 akorotkov@postgresql 2466 : 386262 : AtEOXact_TypeCache();
2467 : :
2468 : : /*
2469 : : * Make catalog changes visible to all backends. This has to happen after
2470 : : * relcache references are dropped (see comments for
2471 : : * AtEOXact_RelationCache), but before locks are released (if anyone is
2472 : : * waiting for lock on a relation we've modified, we want them to know
2473 : : * about the catalog change before they start using the relation).
2474 : : */
7962 tgl@sss.pgh.pa.us 2475 : 386262 : AtEOXact_Inval(true);
2476 : :
7677 2477 : 386262 : AtEOXact_MultiXact();
2478 : :
7962 2479 : 386262 : ResourceOwnerRelease(TopTransactionResourceOwner,
2480 : : RESOURCE_RELEASE_LOCKS,
2481 : : true, true);
2482 : 386262 : ResourceOwnerRelease(TopTransactionResourceOwner,
2483 : : RESOURCE_RELEASE_AFTER_LOCKS,
2484 : : true, true);
2485 : :
2486 : : /*
2487 : : * Likewise, dropping of files deleted during the transaction is best done
2488 : : * after releasing relcache and buffer pins. (This is not strictly
2489 : : * necessary during commit, since such pins should have been released
2490 : : * already, but this ordering is definitely critical during abort.) Since
2491 : : * this may take many seconds, also delay until after releasing locks.
2492 : : * Other backends will observe the attendant catalog changes and not
2493 : : * attempt to access affected files.
2494 : : */
5073 rhaas@postgresql.org 2495 : 386262 : smgrDoPendingDeletes(true);
2496 : :
2497 : : /*
2498 : : * Send out notification signals to other backends (and do other
2499 : : * post-commit NOTIFY cleanup). This must not happen until after our
2500 : : * transaction is fully done from the viewpoint of other backends.
2501 : : */
5922 tgl@sss.pgh.pa.us 2502 : 386262 : AtCommit_Notify();
2503 : :
2504 : : /*
2505 : : * Everything after this should be purely internal-to-this-backend
2506 : : * cleanup.
2507 : : */
6819 2508 : 386262 : AtEOXact_GUC(true, 1);
8190 mail@joeconway.com 2509 : 386262 : AtEOXact_SPI(true);
2765 tmunro@postgresql.or 2510 : 386262 : AtEOXact_Enum();
7901 tgl@sss.pgh.pa.us 2511 : 386262 : AtEOXact_on_commit_actions(true);
4023 rhaas@postgresql.org 2512 : 386262 : AtEOXact_Namespace(true, is_parallel_worker);
4948 tgl@sss.pgh.pa.us 2513 : 386262 : AtEOXact_SMgr();
2929 2514 : 386262 : AtEOXact_Files(true);
7025 2515 : 386262 : AtEOXact_ComboCid();
6949 2516 : 386262 : AtEOXact_HashTables(true);
2582 akapila@postgresql.o 2517 : 386262 : AtEOXact_PgStat(true, is_parallel_worker);
3316 simon@2ndQuadrant.co 2518 : 386262 : AtEOXact_Snapshot(true, false);
3291 peter_e@gmx.net 2519 : 386262 : AtEOXact_ApplyLauncher(true);
1215 tgl@sss.pgh.pa.us 2520 : 386262 : AtEOXact_LogicalRepWorkers(true);
133 msawada@postgresql.o 2521 :GNC 386262 : AtEOXact_LogicalCtl();
6811 tgl@sss.pgh.pa.us 2522 :CBC 386262 : pgstat_report_xact_timestamp(0);
2523 : :
7962 2524 : 386262 : ResourceOwnerDelete(TopTransactionResourceOwner);
2525 : 386262 : s->curTransactionOwner = NULL;
2526 : 386262 : CurTransactionResourceOwner = NULL;
2527 : 386262 : TopTransactionResourceOwner = NULL;
2528 : :
8596 2529 : 386262 : AtCommit_Memory();
2530 : :
2595 tmunro@postgresql.or 2531 : 386262 : s->fullTransactionId = InvalidFullTransactionId;
7901 tgl@sss.pgh.pa.us 2532 : 386262 : s->subTransactionId = InvalidSubTransactionId;
7978 2533 : 386262 : s->nestingLevel = 0;
6819 2534 : 386262 : s->gucNestLevel = 0;
6623 2535 : 386262 : s->childXids = NULL;
2536 : 386262 : s->nChildXids = 0;
2537 : 386262 : s->maxChildXids = 0;
2538 : :
2595 tmunro@postgresql.or 2539 : 386262 : XactTopFullTransactionId = InvalidFullTransactionId;
4023 rhaas@postgresql.org 2540 : 386262 : nParallelCurrentXids = 0;
2541 : :
2542 : : /*
2543 : : * done with commit processing, set current transaction state back to
2544 : : * default
2545 : : */
10467 bruce@momjian.us 2546 : 386262 : s->state = TRANS_DEFAULT;
2547 : :
9237 tgl@sss.pgh.pa.us 2548 [ - + ]: 386262 : RESUME_INTERRUPTS();
10892 scrappy@hub.org 2549 : 386262 : }
2550 : :
2551 : :
2552 : : /*
2553 : : * PrepareTransaction
2554 : : *
2555 : : * NB: if you change this routine, better look at CommitTransaction too!
2556 : : */
2557 : : static void
7627 tgl@sss.pgh.pa.us 2558 : 361 : PrepareTransaction(void)
2559 : : {
7507 bruce@momjian.us 2560 : 361 : TransactionState s = CurrentTransactionState;
302 michael@paquier.xyz 2561 :GNC 361 : FullTransactionId fxid = GetCurrentFullTransactionId();
2562 : : GlobalTransaction gxact;
2563 : : TimestampTz prepared_at;
2564 : :
4023 rhaas@postgresql.org 2565 [ - + ]:CBC 361 : Assert(!IsInParallelMode());
2566 : :
7627 tgl@sss.pgh.pa.us 2567 : 361 : ShowTransactionState("PrepareTransaction");
2568 : :
2569 : : /*
2570 : : * check the current transaction state
2571 : : */
2572 [ - + ]: 361 : if (s->state != TRANS_INPROGRESS)
7627 tgl@sss.pgh.pa.us 2573 [ # # ]:UBC 0 : elog(WARNING, "PrepareTransaction while in %s state",
2574 : : TransStateAsString(s->state));
7627 tgl@sss.pgh.pa.us 2575 [ + - ]:CBC 361 : Assert(s->parent == NULL);
2576 : :
2577 : : /*
2578 : : * Do pre-commit processing that involves calling user-defined code, such
2579 : : * as triggers. Since closing cursors could queue trigger actions,
2580 : : * triggers could open cursors, etc, we have to keep looping until there's
2581 : : * nothing left to do.
2582 : : */
2583 : : for (;;)
2584 : : {
2585 : : /*
2586 : : * Fire all currently pending deferred triggers.
2587 : : */
2588 : 363 : AfterTriggerFireDeferred();
2589 : :
2590 : : /*
2591 : : * Close open portals (converting holdable ones into static portals).
2592 : : * If there weren't any, we are done ... otherwise loop back to check
2593 : : * if they queued deferred triggers. Lather, rinse, repeat.
2594 : : */
5546 2595 [ + + ]: 363 : if (!PreCommit_Portals(true))
7627 2596 : 361 : break;
2597 : : }
2598 : :
4828 2599 : 361 : CallXactCallbacks(XACT_EVENT_PRE_PREPARE);
2600 : :
2601 : : /*
2602 : : * The remaining actions cannot call any user-defined code, so it's safe
2603 : : * to start shutting down within-transaction services. But note that most
2604 : : * of this stuff could still throw an error, which would switch us into
2605 : : * the transaction-abort path.
2606 : : */
2607 : :
2608 : : /* Shut down the deferred-trigger manager */
5546 2609 : 360 : AfterTriggerEndXact(true);
2610 : :
2611 : : /*
2612 : : * Let ON COMMIT management do its thing (must happen after closing
2613 : : * cursors, to avoid dangling-reference problems)
2614 : : */
7627 2615 : 360 : PreCommit_on_commit_actions();
2616 : :
2617 : : /*
2618 : : * Synchronize files that are created and not WAL-logged during this
2619 : : * transaction. This must happen before EndPrepare(), so that we don't see
2620 : : * committed-but-broken files after a crash and COMMIT PREPARED.
2621 : : */
2222 noah@leadboat.com 2622 : 360 : smgrDoPendingSyncs(true, false);
2623 : :
2624 : : /* close large objects before lower-level cleanup */
7627 tgl@sss.pgh.pa.us 2625 : 360 : AtEOXact_LargeObject(true);
2626 : :
2627 : : /* NOTIFY requires no work at this point */
2628 : :
2629 : : /*
2630 : : * Mark serializable transaction as complete for predicate locking
2631 : : * purposes. This should be done as late as we can put it and still allow
2632 : : * errors to be raised for failure patterns found at commit.
2633 : : */
5566 heikki.linnakangas@i 2634 : 360 : PreCommit_CheckForSerializationFailure();
2635 : :
2636 : : /*
2637 : : * Don't allow PREPARE TRANSACTION if we've accessed a temporary table in
2638 : : * this transaction. Having the prepared xact hold locks on another
2639 : : * backend's temp table seems a bad idea --- for instance it would prevent
2640 : : * the backend from exiting. There are other problems too, such as how to
2641 : : * clean up the source backend's local buffers and ON COMMIT state if the
2642 : : * prepared xact includes a DROP of a temp table.
2643 : : *
2644 : : * Other objects types, like functions, operators or extensions, share the
2645 : : * same restriction as they should not be created, locked or dropped as
2646 : : * this can mess up with this session or even a follow-up session trying
2647 : : * to use the same temporary namespace.
2648 : : *
2649 : : * We must check this after executing any ON COMMIT actions, because they
2650 : : * might still access a temp relation.
2651 : : *
2652 : : * XXX In principle this could be relaxed to allow some useful special
2653 : : * cases, such as a temp table created and dropped all within the
2654 : : * transaction. That seems to require much more bookkeeping though.
2655 : : */
2664 michael@paquier.xyz 2656 [ + + ]: 360 : if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
2657 [ + - ]: 45 : ereport(ERROR,
2658 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2659 : : errmsg("cannot PREPARE a transaction that has operated on temporary objects")));
2660 : :
2661 : : /*
2662 : : * Likewise, don't allow PREPARE after pg_export_snapshot. This could be
2663 : : * supported if we added cleanup logic to twophase.c, but for now it
2664 : : * doesn't seem worth the trouble.
2665 : : */
5309 tgl@sss.pgh.pa.us 2666 [ - + ]: 315 : if (XactHasExportedSnapshots())
5309 tgl@sss.pgh.pa.us 2667 [ # # ]:UBC 0 : ereport(ERROR,
2668 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2669 : : errmsg("cannot PREPARE a transaction that has exported snapshots")));
2670 : :
2671 : : /* Prevent cancel/die interrupt while cleaning up */
7627 tgl@sss.pgh.pa.us 2672 :CBC 315 : HOLD_INTERRUPTS();
2673 : :
2674 : : /*
2675 : : * set the current transaction state information appropriately during
2676 : : * prepare processing
2677 : : */
2678 : 315 : s->state = TRANS_PREPARE;
2679 : :
2680 : : /* Disable transaction timeout */
809 akorotkov@postgresql 2681 [ - + ]: 315 : if (TransactionTimeout > 0)
809 akorotkov@postgresql 2682 :UBC 0 : disable_timeout(TRANSACTION_TIMEOUT, false);
2683 : :
7615 tgl@sss.pgh.pa.us 2684 :CBC 315 : prepared_at = GetCurrentTimestamp();
2685 : :
2686 : : /*
2687 : : * Reserve the GID for this transaction. This could fail if the requested
2688 : : * GID is invalid or already in use.
2689 : : */
302 michael@paquier.xyz 2690 :GNC 315 : gxact = MarkAsPreparing(fxid, prepareGID, prepared_at,
2691 : : GetUserId(), MyDatabaseId);
7627 tgl@sss.pgh.pa.us 2692 :CBC 297 : prepareGID = NULL;
2693 : :
2694 : : /*
2695 : : * Collect data for the 2PC state file. Note that in general, no actual
2696 : : * state change should happen in the called modules during this step,
2697 : : * since it's still possible to fail before commit, and in that case we
2698 : : * want transaction abort to be able to clean up. (In particular, the
2699 : : * AtPrepare routines may error out if they find cases they cannot
2700 : : * handle.) State cleanup should happen in the PostPrepare routines
2701 : : * below. However, some modules can go ahead and clear state here because
2702 : : * they wouldn't do anything with it during abort anyway.
2703 : : *
2704 : : * Note: because the 2PC state file records will be replayed in the same
2705 : : * order they are made, the order of these calls has to match the order in
2706 : : * which we want things to happen during COMMIT PREPARED or ROLLBACK
2707 : : * PREPARED; in particular, pay attention to whether things should happen
2708 : : * before or after releasing the transaction's locks.
2709 : : */
2710 : 297 : StartPrepare(gxact);
2711 : :
2712 : 297 : AtPrepare_Notify();
2713 : 297 : AtPrepare_Locks();
5566 heikki.linnakangas@i 2714 : 295 : AtPrepare_PredicateLocks();
6918 tgl@sss.pgh.pa.us 2715 : 295 : AtPrepare_PgStat();
6007 heikki.linnakangas@i 2716 : 295 : AtPrepare_MultiXact();
5931 tgl@sss.pgh.pa.us 2717 : 295 : AtPrepare_RelationMap();
2718 : :
2719 : : /*
2720 : : * Here is where we really truly prepare.
2721 : : *
2722 : : * We have to record transaction prepares even if we didn't make any
2723 : : * updates, because the transaction manager might get confused if we lose
2724 : : * a global transaction.
2725 : : */
7627 2726 : 295 : EndPrepare(gxact);
2727 : :
2728 : : /*
2729 : : * Now we clean up backend-internal state and release internal resources.
2730 : : */
2731 : :
2732 : : /* Reset XactLastRecEnd until the next transaction writes something */
5063 heikki.linnakangas@i 2733 : 295 : XactLastRecEnd = 0;
2734 : :
2735 : : /*
2736 : : * Transfer our locks to a dummy PGPROC. This has to be done before
2737 : : * ProcArrayClearTransaction(). Otherwise, a GetLockConflicts() would
2738 : : * conclude "xact already committed or aborted" for our locks.
2739 : : */
302 michael@paquier.xyz 2740 :GNC 295 : PostPrepare_Locks(fxid);
2741 : :
2742 : : /*
2743 : : * Let others know about no transaction in progress by me. This has to be
2744 : : * done *after* the prepared transaction has been marked valid, else
2745 : : * someone may think it is unlocked and recyclable.
2746 : : */
6814 tgl@sss.pgh.pa.us 2747 :CBC 295 : ProcArrayClearTransaction(MyProc);
2748 : :
2749 : : /*
2750 : : * In normal commit-processing, this is all non-critical post-transaction
2751 : : * cleanup. When the transaction is prepared, however, it's important
2752 : : * that the locks and other per-backend resources are transferred to the
2753 : : * prepared transaction's PGPROC entry. Note that if an error is raised
2754 : : * here, it's too late to abort the transaction. XXX: This probably should
2755 : : * be in a critical section, to force a PANIC if any of this fails, but
2756 : : * that cure could be worse than the disease.
2757 : : */
2758 : :
7627 2759 : 295 : CallXactCallbacks(XACT_EVENT_PREPARE);
2760 : :
2761 : 295 : ResourceOwnerRelease(TopTransactionResourceOwner,
2762 : : RESOURCE_RELEASE_BEFORE_LOCKS,
2763 : : true, true);
2764 : :
414 andres@anarazel.de 2765 : 295 : AtEOXact_Aio(true);
2766 : :
2767 : : /* Check we've released all buffer pins */
7627 tgl@sss.pgh.pa.us 2768 : 295 : AtEOXact_Buffers(true);
2769 : :
2770 : : /* Clean up the relation cache */
7575 2771 : 295 : AtEOXact_RelationCache(true);
2772 : :
2773 : : /* Clean up the type cache */
558 akorotkov@postgresql 2774 : 295 : AtEOXact_TypeCache();
2775 : :
2776 : : /* notify doesn't need a postprepare call */
2777 : :
6918 tgl@sss.pgh.pa.us 2778 : 295 : PostPrepare_PgStat();
2779 : :
7627 2780 : 295 : PostPrepare_Inval();
2781 : :
2782 : 295 : PostPrepare_smgr();
2783 : :
302 michael@paquier.xyz 2784 :GNC 295 : PostPrepare_MultiXact(fxid);
2785 : :
2786 : 295 : PostPrepare_PredicateLocks(fxid);
2787 : :
7627 tgl@sss.pgh.pa.us 2788 :CBC 295 : ResourceOwnerRelease(TopTransactionResourceOwner,
2789 : : RESOURCE_RELEASE_LOCKS,
2790 : : true, true);
2791 : 295 : ResourceOwnerRelease(TopTransactionResourceOwner,
2792 : : RESOURCE_RELEASE_AFTER_LOCKS,
2793 : : true, true);
2794 : :
2795 : : /*
2796 : : * Allow another backend to finish the transaction. After
2797 : : * PostPrepare_Twophase(), the transaction is completely detached from our
2798 : : * backend. The rest is just non-critical cleanup of backend-local state.
2799 : : */
4373 heikki.linnakangas@i 2800 : 295 : PostPrepare_Twophase();
2801 : :
2802 : : /* PREPARE acts the same as COMMIT as far as GUC is concerned */
6819 tgl@sss.pgh.pa.us 2803 : 295 : AtEOXact_GUC(true, 1);
7627 2804 : 295 : AtEOXact_SPI(true);
2765 tmunro@postgresql.or 2805 : 295 : AtEOXact_Enum();
7627 tgl@sss.pgh.pa.us 2806 : 295 : AtEOXact_on_commit_actions(true);
4023 rhaas@postgresql.org 2807 : 295 : AtEOXact_Namespace(true, false);
4948 tgl@sss.pgh.pa.us 2808 : 295 : AtEOXact_SMgr();
2929 2809 : 295 : AtEOXact_Files(true);
7025 2810 : 295 : AtEOXact_ComboCid();
6949 2811 : 295 : AtEOXact_HashTables(true);
2812 : : /* don't call AtEOXact_PgStat here; we fixed pgstat state above */
3316 simon@2ndQuadrant.co 2813 : 295 : AtEOXact_Snapshot(true, true);
2814 : : /* we treat PREPARE as ROLLBACK so far as waking workers goes */
1215 tgl@sss.pgh.pa.us 2815 : 295 : AtEOXact_ApplyLauncher(false);
2816 : 295 : AtEOXact_LogicalRepWorkers(false);
133 msawada@postgresql.o 2817 :GNC 295 : AtEOXact_LogicalCtl();
4394 tgl@sss.pgh.pa.us 2818 :CBC 295 : pgstat_report_xact_timestamp(0);
2819 : :
7627 2820 : 295 : CurrentResourceOwner = NULL;
2821 : 295 : ResourceOwnerDelete(TopTransactionResourceOwner);
2822 : 295 : s->curTransactionOwner = NULL;
2823 : 295 : CurTransactionResourceOwner = NULL;
2824 : 295 : TopTransactionResourceOwner = NULL;
2825 : :
2826 : 295 : AtCommit_Memory();
2827 : :
2595 tmunro@postgresql.or 2828 : 295 : s->fullTransactionId = InvalidFullTransactionId;
7627 tgl@sss.pgh.pa.us 2829 : 295 : s->subTransactionId = InvalidSubTransactionId;
2830 : 295 : s->nestingLevel = 0;
6819 2831 : 295 : s->gucNestLevel = 0;
6623 2832 : 295 : s->childXids = NULL;
2833 : 295 : s->nChildXids = 0;
2834 : 295 : s->maxChildXids = 0;
2835 : :
2595 tmunro@postgresql.or 2836 : 295 : XactTopFullTransactionId = InvalidFullTransactionId;
4023 rhaas@postgresql.org 2837 : 295 : nParallelCurrentXids = 0;
2838 : :
2839 : : /*
2840 : : * done with 1st phase commit processing, set current transaction state
2841 : : * back to default
2842 : : */
7627 tgl@sss.pgh.pa.us 2843 : 295 : s->state = TRANS_DEFAULT;
2844 : :
2845 [ - + ]: 295 : RESUME_INTERRUPTS();
2846 : 295 : }
2847 : :
2848 : :
2849 : : /*
2850 : : * AbortTransaction
2851 : : */
2852 : : static void
9324 2853 : 35291 : AbortTransaction(void)
2854 : : {
10467 bruce@momjian.us 2855 : 35291 : TransactionState s = CurrentTransactionState;
2856 : : TransactionId latestXid;
2857 : : bool is_parallel_worker;
2858 : :
2859 : : /* Prevent cancel/die interrupt while cleaning up */
9237 tgl@sss.pgh.pa.us 2860 : 35291 : HOLD_INTERRUPTS();
2861 : :
2862 : : /* Disable transaction timeout */
809 akorotkov@postgresql 2863 [ + + ]: 35291 : if (TransactionTimeout > 0)
2864 : 1 : disable_timeout(TRANSACTION_TIMEOUT, false);
2865 : :
2866 : : /* Make sure we have a valid memory context and resource owner */
7103 tgl@sss.pgh.pa.us 2867 : 35291 : AtAbort_Memory();
2868 : 35291 : AtAbort_ResourceOwner();
2869 : :
2870 : : /*
2871 : : * Release any LW locks we might be holding as quickly as possible.
2872 : : * (Regular locks, however, must be held till we finish aborting.)
2873 : : * Releasing LW locks is critical since we might try to grab them again
2874 : : * while cleaning up!
2875 : : */
8984 2876 : 35291 : LWLockReleaseAll();
2877 : :
2878 : : /*
2879 : : * Cleanup waiting for LSN if any.
2880 : : */
181 akorotkov@postgresql 2881 :GNC 35291 : WaitLSNCleanup();
2882 : :
2883 : : /* Clear wait information and command progress indicator */
3708 rhaas@postgresql.org 2884 :CBC 35291 : pgstat_report_wait_end();
2885 : 35291 : pgstat_progress_end_command();
2886 : :
414 andres@anarazel.de 2887 : 35291 : pgaio_error_cleanup();
2888 : :
2889 : : /* Clean up buffer content locks, too */
9269 tgl@sss.pgh.pa.us 2890 : 35291 : UnlockBuffers();
2891 : :
2892 : : /* Reset WAL record construction state */
4184 heikki.linnakangas@i 2893 : 35291 : XLogResetInsertion();
2894 : :
2895 : : /* Cancel condition variable sleep */
3451 rhaas@postgresql.org 2896 : 35291 : ConditionVariableCancelSleep();
2897 : :
2898 : : /*
2899 : : * Also clean up any open wait for lock, since the lock manager will choke
2900 : : * if we try to wait for another lock before doing this.
2901 : : */
5130 2902 : 35291 : LockErrorCleanup();
2903 : :
2904 : : /*
2905 : : * If any timeout events are still active, make sure the timeout interrupt
2906 : : * is scheduled. This covers possible loss of a timeout interrupt due to
2907 : : * longjmp'ing out of the SIGINT handler (see notes in handle_sig_alarm).
2908 : : * We delay this till after LockErrorCleanup so that we don't uselessly
2909 : : * reschedule lock or deadlock check timeouts.
2910 : : */
4540 tgl@sss.pgh.pa.us 2911 : 35291 : reschedule_timeouts();
2912 : :
2913 : : /*
2914 : : * Re-enable signals, in case we got here by longjmp'ing out of a signal
2915 : : * handler. We do this fairly early in the sequence so that the timeout
2916 : : * infrastructure will be functional if needed while aborting.
2917 : : */
1187 tmunro@postgresql.or 2918 : 35291 : sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
2919 : :
2920 : : /*
2921 : : * check the current transaction state
2922 : : */
4023 rhaas@postgresql.org 2923 : 35291 : is_parallel_worker = (s->blockState == TBLOCK_PARALLEL_INPROGRESS);
7627 tgl@sss.pgh.pa.us 2924 [ + + - + ]: 35291 : if (s->state != TRANS_INPROGRESS && s->state != TRANS_PREPARE)
7951 tgl@sss.pgh.pa.us 2925 [ # # ]:UBC 0 : elog(WARNING, "AbortTransaction while in %s state",
2926 : : TransStateAsString(s->state));
7978 tgl@sss.pgh.pa.us 2927 [ - + ]:CBC 35291 : Assert(s->parent == NULL);
2928 : :
2929 : : /*
2930 : : * set the current transaction state information appropriately during the
2931 : : * abort processing
2932 : : */
10467 bruce@momjian.us 2933 : 35291 : s->state = TRANS_ABORT;
2934 : :
2935 : : /*
2936 : : * Reset user ID which might have been changed transiently. We need this
2937 : : * to clean up in case control escaped out of a SECURITY DEFINER function
2938 : : * or other local change of CurrentUserId; therefore, the prior value of
2939 : : * SecurityRestrictionContext also needs to be restored.
2940 : : *
2941 : : * (Note: it is not necessary to restore session authorization or role
2942 : : * settings here because those can only be changed via GUC, and GUC will
2943 : : * take care of rolling them back if need be.)
2944 : : */
5991 tgl@sss.pgh.pa.us 2945 : 35291 : SetUserIdAndSecContext(s->prevUser, s->prevSecContext);
2946 : :
2947 : : /* Forget about any active REINDEX. */
2205 2948 : 35291 : ResetReindexState(s->nestingLevel);
2949 : :
2950 : : /* Reset logical streaming state. */
2096 akapila@postgresql.o 2951 : 35291 : ResetLogicalStreamingState();
2952 : :
2953 : : /* Reset snapshot export state. */
1660 michael@paquier.xyz 2954 : 35291 : SnapBuildResetExportedSnapshotState();
2955 : :
2956 : : /*
2957 : : * If this xact has started any unfinished parallel operation, clean up
2958 : : * its workers and exit parallel mode. Don't warn about leaked resources.
2959 : : */
768 tgl@sss.pgh.pa.us 2960 : 35291 : AtEOXact_Parallel(false);
2961 : 35291 : s->parallelModeLevel = 0;
2962 : 35291 : s->parallelChildXact = false; /* should be false already */
2963 : :
2964 : : /*
2965 : : * do abort processing
2966 : : */
5912 bruce@momjian.us 2967 : 35291 : AfterTriggerEndXact(false); /* 'false' means it's abort */
8404 tgl@sss.pgh.pa.us 2968 : 35291 : AtAbort_Portals();
2222 noah@leadboat.com 2969 : 35291 : smgrDoPendingSyncs(false, is_parallel_worker);
5931 tgl@sss.pgh.pa.us 2970 : 35291 : AtEOXact_LargeObject(false);
10073 2971 : 35291 : AtAbort_Notify();
2825 pg@bowt.ie 2972 : 35291 : AtEOXact_RelationMap(false, is_parallel_worker);
4373 heikki.linnakangas@i 2973 : 35291 : AtAbort_Twophase();
2974 : :
2975 : : /*
2976 : : * Advertise the fact that we aborted in pg_xact (assuming that we got as
2977 : : * far as assigning an XID to advertise). But if we're inside a parallel
2978 : : * worker, skip this; the user backend must be the one to write the abort
2979 : : * record.
2980 : : */
4023 rhaas@postgresql.org 2981 [ + + ]: 35291 : if (!is_parallel_worker)
2982 : 35283 : latestXid = RecordTransactionAbort(false);
2983 : : else
2984 : : {
2985 : 8 : latestXid = InvalidTransactionId;
2986 : :
2987 : : /*
2988 : : * Since the parallel leader won't get our value of XactLastRecEnd in
2989 : : * this case, we nudge WAL-writer ourselves in this case. See related
2990 : : * comments in RecordTransactionAbort for why this matters.
2991 : : */
2992 : 8 : XLogSetAsyncXactLSN(XactLastRecEnd);
2993 : : }
2994 : :
2995 : : TRACE_POSTGRESQL_TRANSACTION_ABORT(MyProc->vxid.lxid);
2996 : :
2997 : : /*
2998 : : * Let others know about no transaction in progress by me. Note that this
2999 : : * must be done _before_ releasing locks we hold and _after_
3000 : : * RecordTransactionAbort.
3001 : : */
6814 tgl@sss.pgh.pa.us 3002 : 35291 : ProcArrayEndTransaction(MyProc, latestXid);
3003 : :
3004 : : /*
3005 : : * Post-abort cleanup. See notes in CommitTransaction() concerning
3006 : : * ordering. We can skip all of it if the transaction failed before
3007 : : * creating a resource owner.
3008 : : */
5945 3009 [ + - ]: 35291 : if (TopTransactionResourceOwner != NULL)
3010 : : {
4023 rhaas@postgresql.org 3011 [ + + ]: 35291 : if (is_parallel_worker)
3012 : 8 : CallXactCallbacks(XACT_EVENT_PARALLEL_ABORT);
3013 : : else
3014 : 35283 : CallXactCallbacks(XACT_EVENT_ABORT);
3015 : :
5945 tgl@sss.pgh.pa.us 3016 : 35291 : ResourceOwnerRelease(TopTransactionResourceOwner,
3017 : : RESOURCE_RELEASE_BEFORE_LOCKS,
3018 : : false, true);
414 andres@anarazel.de 3019 : 35291 : AtEOXact_Aio(false);
5945 tgl@sss.pgh.pa.us 3020 : 35291 : AtEOXact_Buffers(false);
3021 : 35291 : AtEOXact_RelationCache(false);
558 akorotkov@postgresql 3022 : 35291 : AtEOXact_TypeCache();
5945 tgl@sss.pgh.pa.us 3023 : 35291 : AtEOXact_Inval(false);
3024 : 35291 : AtEOXact_MultiXact();
3025 : 35291 : ResourceOwnerRelease(TopTransactionResourceOwner,
3026 : : RESOURCE_RELEASE_LOCKS,
3027 : : false, true);
3028 : 35291 : ResourceOwnerRelease(TopTransactionResourceOwner,
3029 : : RESOURCE_RELEASE_AFTER_LOCKS,
3030 : : false, true);
5073 rhaas@postgresql.org 3031 : 35291 : smgrDoPendingDeletes(false);
3032 : :
5945 tgl@sss.pgh.pa.us 3033 : 35291 : AtEOXact_GUC(false, 1);
3034 : 35291 : AtEOXact_SPI(false);
2765 tmunro@postgresql.or 3035 : 35291 : AtEOXact_Enum();
5945 tgl@sss.pgh.pa.us 3036 : 35291 : AtEOXact_on_commit_actions(false);
4023 rhaas@postgresql.org 3037 : 35291 : AtEOXact_Namespace(false, is_parallel_worker);
4948 tgl@sss.pgh.pa.us 3038 : 35291 : AtEOXact_SMgr();
2929 3039 : 35291 : AtEOXact_Files(false);
5945 3040 : 35291 : AtEOXact_ComboCid();
3041 : 35291 : AtEOXact_HashTables(false);
2582 akapila@postgresql.o 3042 : 35291 : AtEOXact_PgStat(false, is_parallel_worker);
3291 peter_e@gmx.net 3043 : 35291 : AtEOXact_ApplyLauncher(false);
1215 tgl@sss.pgh.pa.us 3044 : 35291 : AtEOXact_LogicalRepWorkers(false);
133 msawada@postgresql.o 3045 :GNC 35291 : AtEOXact_LogicalCtl();
5945 tgl@sss.pgh.pa.us 3046 :CBC 35291 : pgstat_report_xact_timestamp(0);
3047 : : }
3048 : :
3049 : : /*
3050 : : * State remains TRANS_ABORT until CleanupTransaction().
3051 : : */
9237 3052 [ - + ]: 35291 : RESUME_INTERRUPTS();
9442 3053 : 35291 : }
3054 : :
3055 : : /*
3056 : : * CleanupTransaction
3057 : : */
3058 : : static void
9324 3059 : 35291 : CleanupTransaction(void)
3060 : : {
9442 3061 : 35291 : TransactionState s = CurrentTransactionState;
3062 : :
3063 : : /*
3064 : : * State should still be TRANS_ABORT from AbortTransaction().
3065 : : */
3066 [ - + ]: 35291 : if (s->state != TRANS_ABORT)
7948 tgl@sss.pgh.pa.us 3067 [ # # ]:UBC 0 : elog(FATAL, "CleanupTransaction: unexpected state %s",
3068 : : TransStateAsString(s->state));
3069 : :
3070 : : /*
3071 : : * do abort cleanup processing
3072 : : */
8404 tgl@sss.pgh.pa.us 3073 :CBC 35291 : AtCleanup_Portals(); /* now safe to release portal memory */
3240 3074 : 35291 : AtEOXact_Snapshot(false, true); /* and release the transaction's snapshots */
3075 : :
7919 bruce@momjian.us 3076 : 35291 : CurrentResourceOwner = NULL; /* and resource owner */
7901 tgl@sss.pgh.pa.us 3077 [ + - ]: 35291 : if (TopTransactionResourceOwner)
3078 : 35291 : ResourceOwnerDelete(TopTransactionResourceOwner);
7962 3079 : 35291 : s->curTransactionOwner = NULL;
3080 : 35291 : CurTransactionResourceOwner = NULL;
3081 : 35291 : TopTransactionResourceOwner = NULL;
3082 : :
8404 3083 : 35291 : AtCleanup_Memory(); /* and transaction memory */
3084 : :
2595 tmunro@postgresql.or 3085 : 35291 : s->fullTransactionId = InvalidFullTransactionId;
7901 tgl@sss.pgh.pa.us 3086 : 35291 : s->subTransactionId = InvalidSubTransactionId;
7978 3087 : 35291 : s->nestingLevel = 0;
6819 3088 : 35291 : s->gucNestLevel = 0;
6623 3089 : 35291 : s->childXids = NULL;
3090 : 35291 : s->nChildXids = 0;
3091 : 35291 : s->maxChildXids = 0;
4023 rhaas@postgresql.org 3092 : 35291 : s->parallelModeLevel = 0;
768 tgl@sss.pgh.pa.us 3093 : 35291 : s->parallelChildXact = false;
3094 : :
2595 tmunro@postgresql.or 3095 : 35291 : XactTopFullTransactionId = InvalidFullTransactionId;
4023 rhaas@postgresql.org 3096 : 35291 : nParallelCurrentXids = 0;
3097 : :
3098 : : /*
3099 : : * done with abort processing, set current transaction state back to
3100 : : * default
3101 : : */
10467 bruce@momjian.us 3102 : 35291 : s->state = TRANS_DEFAULT;
3103 : 35291 : }
3104 : :
3105 : : /*
3106 : : * StartTransactionCommand
3107 : : */
3108 : : void
8392 tgl@sss.pgh.pa.us 3109 : 526616 : StartTransactionCommand(void)
3110 : : {
10467 bruce@momjian.us 3111 : 526616 : TransactionState s = CurrentTransactionState;
3112 : :
3113 [ + + + - : 526616 : switch (s->blockState)
- ]
3114 : : {
3115 : : /*
3116 : : * if we aren't in a transaction block, we just do our usual start
3117 : : * transaction.
3118 : : */
10466 3119 : 419800 : case TBLOCK_DEFAULT:
3120 : 419800 : StartTransaction();
8065 3121 : 419800 : s->blockState = TBLOCK_STARTED;
3122 : 419800 : break;
3123 : :
3124 : : /*
3125 : : * We are somewhere in a transaction block or subtransaction and
3126 : : * about to start a new command. For now we do nothing, but
3127 : : * someday we may do command-local resource initialization. (Note
3128 : : * that any needed CommandCounterIncrement was done by the
3129 : : * previous CommitTransactionCommand.)
3130 : : */
10466 3131 : 105631 : case TBLOCK_INPROGRESS:
3132 : : case TBLOCK_IMPLICIT_INPROGRESS:
3133 : : case TBLOCK_SUBINPROGRESS:
3134 : 105631 : break;
3135 : :
3136 : : /*
3137 : : * Here we are in a failed transaction block (one of the commands
3138 : : * caused an abort) so we do nothing but remain in the abort
3139 : : * state. Eventually we will get a ROLLBACK command which will
3140 : : * get us out of this state. (It is up to other code to ensure
3141 : : * that no commands other than ROLLBACK will be processed in these
3142 : : * states.)
3143 : : */
3144 : 1185 : case TBLOCK_ABORT:
3145 : : case TBLOCK_SUBABORT:
3146 : 1185 : break;
3147 : :
3148 : : /* These cases are invalid. */
7978 tgl@sss.pgh.pa.us 3149 :UBC 0 : case TBLOCK_STARTED:
3150 : : case TBLOCK_BEGIN:
3151 : : case TBLOCK_PARALLEL_INPROGRESS:
3152 : : case TBLOCK_SUBBEGIN:
3153 : : case TBLOCK_END:
3154 : : case TBLOCK_SUBRELEASE:
3155 : : case TBLOCK_SUBCOMMIT:
3156 : : case TBLOCK_ABORT_END:
3157 : : case TBLOCK_SUBABORT_END:
3158 : : case TBLOCK_ABORT_PENDING:
3159 : : case TBLOCK_SUBABORT_PENDING:
3160 : : case TBLOCK_SUBRESTART:
3161 : : case TBLOCK_SUBABORT_RESTART:
3162 : : case TBLOCK_PREPARE:
7901 3163 [ # # ]: 0 : elog(ERROR, "StartTransactionCommand: unexpected state %s",
3164 : : BlockStateAsString(s->blockState));
3165 : : break;
3166 : : }
3167 : :
3168 : : /*
3169 : : * We must switch to CurTransactionContext before returning. This is
3170 : : * already done if we called StartTransaction, otherwise not.
3171 : : */
7978 tgl@sss.pgh.pa.us 3172 [ - + ]:CBC 526616 : Assert(CurTransactionContext != NULL);
3173 : 526616 : MemoryContextSwitchTo(CurTransactionContext);
10467 bruce@momjian.us 3174 : 526616 : }
3175 : :
3176 : :
3177 : : /*
3178 : : * Simple system for saving and restoring transaction characteristics
3179 : : * (isolation level, read only, deferrable). We need this for transaction
3180 : : * chaining, so that we can set the characteristics of the new transaction to
3181 : : * be the same as the previous one. (We need something like this because the
3182 : : * GUC system resets the characteristics at transaction end, so for example
3183 : : * just skipping the reset in StartTransaction() won't work.)
3184 : : */
3185 : : void
1527 tgl@sss.pgh.pa.us 3186 : 493908 : SaveTransactionCharacteristics(SavedTransactionCharacteristics *s)
3187 : : {
3188 : 493908 : s->save_XactIsoLevel = XactIsoLevel;
3189 : 493908 : s->save_XactReadOnly = XactReadOnly;
3190 : 493908 : s->save_XactDeferrable = XactDeferrable;
2599 peter@eisentraut.org 3191 : 493908 : }
3192 : :
3193 : : void
1527 tgl@sss.pgh.pa.us 3194 : 44 : RestoreTransactionCharacteristics(const SavedTransactionCharacteristics *s)
3195 : : {
3196 : 44 : XactIsoLevel = s->save_XactIsoLevel;
3197 : 44 : XactReadOnly = s->save_XactReadOnly;
3198 : 44 : XactDeferrable = s->save_XactDeferrable;
2599 peter@eisentraut.org 3199 : 44 : }
3200 : :
3201 : : /*
3202 : : * CommitTransactionCommand -- a wrapper function handling the
3203 : : * loop over subtransactions to avoid a potentially dangerous recursion
3204 : : * in CommitTransactionCommandInternal().
3205 : : */
3206 : : void
8392 tgl@sss.pgh.pa.us 3207 : 493612 : CommitTransactionCommand(void)
3208 : : {
3209 : : /*
3210 : : * Repeatedly call CommitTransactionCommandInternal() until all the work
3211 : : * is done.
3212 : : */
747 akorotkov@postgresql 3213 [ + + ]: 493904 : while (!CommitTransactionCommandInternal())
3214 : : {
3215 : : }
788 3216 : 493279 : }
3217 : :
3218 : : /*
3219 : : * CommitTransactionCommandInternal - a function doing an iteration of work
3220 : : * regarding handling the commit transaction command. In the case of
3221 : : * subtransactions more than one iterations could be required. Returns
3222 : : * true when no more iterations required, false otherwise.
3223 : : */
3224 : : static bool
3225 : 493904 : CommitTransactionCommandInternal(void)
3226 : : {
10467 bruce@momjian.us 3227 : 493904 : TransactionState s = CurrentTransactionState;
3228 : : SavedTransactionCharacteristics savetc;
3229 : :
3230 : : /* Must save in case we need to restore below */
1527 tgl@sss.pgh.pa.us 3231 : 493904 : SaveTransactionCharacteristics(&savetc);
3232 : :
10467 bruce@momjian.us 3233 [ - + + + : 493904 : switch (s->blockState)
+ + + + +
+ + + + +
+ + - ]
3234 : : {
3235 : : /*
3236 : : * These shouldn't happen. TBLOCK_DEFAULT means the previous
3237 : : * StartTransactionCommand didn't set the STARTED state
3238 : : * appropriately, while TBLOCK_PARALLEL_INPROGRESS should be ended
3239 : : * by EndParallelWorkerTransaction(), not this function.
3240 : : */
8065 bruce@momjian.us 3241 :UBC 0 : case TBLOCK_DEFAULT:
3242 : : case TBLOCK_PARALLEL_INPROGRESS:
7952 tgl@sss.pgh.pa.us 3243 [ # # ]: 0 : elog(FATAL, "CommitTransactionCommand: unexpected state %s",
3244 : : BlockStateAsString(s->blockState));
3245 : : break;
3246 : :
3247 : : /*
3248 : : * If we aren't in a transaction block, just do our usual
3249 : : * transaction commit, and return to the idle state.
3250 : : */
8065 bruce@momjian.us 3251 :CBC 375258 : case TBLOCK_STARTED:
8392 tgl@sss.pgh.pa.us 3252 : 375258 : CommitTransaction();
8065 bruce@momjian.us 3253 : 375247 : s->blockState = TBLOCK_DEFAULT;
10466 3254 : 375247 : break;
3255 : :
3256 : : /*
3257 : : * We are completing a "BEGIN TRANSACTION" command, so we change
3258 : : * to the "transaction block in progress" state and return. (We
3259 : : * assume the BEGIN did nothing to the database, so we need no
3260 : : * CommandCounterIncrement.)
3261 : : */
3262 : 12617 : case TBLOCK_BEGIN:
3263 : 12617 : s->blockState = TBLOCK_INPROGRESS;
3264 : 12617 : break;
3265 : :
3266 : : /*
3267 : : * This is the case when we have finished executing a command
3268 : : * someplace within a transaction block. We increment the command
3269 : : * counter and return.
3270 : : */
3271 : 80576 : case TBLOCK_INPROGRESS:
3272 : : case TBLOCK_IMPLICIT_INPROGRESS:
3273 : : case TBLOCK_SUBINPROGRESS:
3274 : 80576 : CommandCounterIncrement();
3275 : 80576 : break;
3276 : :
3277 : : /*
3278 : : * We are completing a "COMMIT" command. Do it and return to the
3279 : : * idle state.
3280 : : */
3281 : 8852 : case TBLOCK_END:
3282 : 8852 : CommitTransaction();
9442 tgl@sss.pgh.pa.us 3283 : 8613 : s->blockState = TBLOCK_DEFAULT;
2599 peter@eisentraut.org 3284 [ + + ]: 8613 : if (s->chain)
3285 : : {
3286 : 8 : StartTransaction();
3287 : 8 : s->blockState = TBLOCK_INPROGRESS;
3288 : 8 : s->chain = false;
1527 tgl@sss.pgh.pa.us 3289 : 8 : RestoreTransactionCharacteristics(&savetc);
3290 : : }
10466 bruce@momjian.us 3291 : 8613 : break;
3292 : :
3293 : : /*
3294 : : * Here we are in the middle of a transaction block but one of the
3295 : : * commands caused an abort so we do nothing but remain in the
3296 : : * abort state. Eventually we will get a ROLLBACK command.
3297 : : */
3298 : 12 : case TBLOCK_ABORT:
3299 : : case TBLOCK_SUBABORT:
3300 : 12 : break;
3301 : :
3302 : : /*
3303 : : * Here we were in an aborted transaction block and we just got
3304 : : * the ROLLBACK command from the user, so clean up the
3305 : : * already-aborted transaction and return to the idle state.
3306 : : */
7901 tgl@sss.pgh.pa.us 3307 : 911 : case TBLOCK_ABORT_END:
9442 3308 : 911 : CleanupTransaction();
10466 bruce@momjian.us 3309 : 911 : s->blockState = TBLOCK_DEFAULT;
2599 peter@eisentraut.org 3310 [ + + ]: 911 : if (s->chain)
3311 : : {
3312 : 8 : StartTransaction();
3313 : 8 : s->blockState = TBLOCK_INPROGRESS;
3314 : 8 : s->chain = false;
1527 tgl@sss.pgh.pa.us 3315 : 8 : RestoreTransactionCharacteristics(&savetc);
3316 : : }
10466 bruce@momjian.us 3317 : 911 : break;
3318 : :
3319 : : /*
3320 : : * Here we were in a perfectly good transaction block but the user
3321 : : * told us to ROLLBACK anyway. We have to abort the transaction
3322 : : * and then clean up.
3323 : : */
7901 tgl@sss.pgh.pa.us 3324 : 1783 : case TBLOCK_ABORT_PENDING:
3325 : 1783 : AbortTransaction();
3326 : 1783 : CleanupTransaction();
3327 : 1783 : s->blockState = TBLOCK_DEFAULT;
2599 peter@eisentraut.org 3328 [ + + ]: 1783 : if (s->chain)
3329 : : {
3330 : 12 : StartTransaction();
3331 : 12 : s->blockState = TBLOCK_INPROGRESS;
3332 : 12 : s->chain = false;
1527 tgl@sss.pgh.pa.us 3333 : 12 : RestoreTransactionCharacteristics(&savetc);
3334 : : }
7952 3335 : 1783 : break;
3336 : :
3337 : : /*
3338 : : * We are completing a "PREPARE TRANSACTION" command. Do it and
3339 : : * return to the idle state.
3340 : : */
7627 3341 : 258 : case TBLOCK_PREPARE:
3342 : 258 : PrepareTransaction();
3343 : 194 : s->blockState = TBLOCK_DEFAULT;
3344 : 194 : break;
3345 : :
3346 : : /*
3347 : : * The user issued a SAVEPOINT inside a transaction block. Start a
3348 : : * subtransaction. (DefineSavepoint already did PushTransaction,
3349 : : * so as to have someplace to put the SUBBEGIN state.)
3350 : : */
7978 3351 : 12168 : case TBLOCK_SUBBEGIN:
3352 : 12168 : StartSubTransaction();
3353 : 12168 : s->blockState = TBLOCK_SUBINPROGRESS;
3354 : 12168 : break;
3355 : :
3356 : : /*
3357 : : * The user issued a RELEASE command, so we end the current
3358 : : * subtransaction and return to the parent transaction. The parent
3359 : : * might be ended too, so repeat till we find an INPROGRESS
3360 : : * transaction or subtransaction.
3361 : : */
5404 simon@2ndQuadrant.co 3362 : 264 : case TBLOCK_SUBRELEASE:
3363 : : do
3364 : : {
5354 3365 : 264 : CommitSubTransaction();
7919 bruce@momjian.us 3366 : 264 : s = CurrentTransactionState; /* changed by pop */
5404 simon@2ndQuadrant.co 3367 [ + + ]: 264 : } while (s->blockState == TBLOCK_SUBRELEASE);
3368 : :
3369 [ + + - + ]: 177 : Assert(s->blockState == TBLOCK_INPROGRESS ||
3370 : : s->blockState == TBLOCK_SUBINPROGRESS);
3371 : 177 : break;
3372 : :
3373 : : /*
3374 : : * The user issued a COMMIT, so we end the current subtransaction
3375 : : * hierarchy and perform final commit. We do this by rolling up
3376 : : * any subtransactions into their parent, which leads to O(N^2)
3377 : : * operations with respect to resource owners - this isn't that
3378 : : * bad until we approach a thousands of savepoints but is
3379 : : * necessary for correctness should after triggers create new
3380 : : * resource owners.
3381 : : */
3382 : 611 : case TBLOCK_SUBCOMMIT:
3383 : : do
3384 : : {
5354 3385 : 611 : CommitSubTransaction();
5404 3386 : 611 : s = CurrentTransactionState; /* changed by pop */
3387 [ + + ]: 611 : } while (s->blockState == TBLOCK_SUBCOMMIT);
3388 : : /* If we had a COMMIT command, finish off the main xact too */
7907 tgl@sss.pgh.pa.us 3389 [ + + ]: 522 : if (s->blockState == TBLOCK_END)
3390 : : {
3391 [ - + ]: 419 : Assert(s->parent == NULL);
3392 : 419 : CommitTransaction();
3393 : 402 : s->blockState = TBLOCK_DEFAULT;
1901 fujii@postgresql.org 3394 [ + + ]: 402 : if (s->chain)
3395 : : {
3396 : 12 : StartTransaction();
3397 : 12 : s->blockState = TBLOCK_INPROGRESS;
3398 : 12 : s->chain = false;
1527 tgl@sss.pgh.pa.us 3399 : 12 : RestoreTransactionCharacteristics(&savetc);
3400 : : }
3401 : : }
7627 3402 [ + - ]: 103 : else if (s->blockState == TBLOCK_PREPARE)
3403 : : {
3404 [ - + ]: 103 : Assert(s->parent == NULL);
3405 : 103 : PrepareTransaction();
3406 : 101 : s->blockState = TBLOCK_DEFAULT;
3407 : : }
3408 : : else
5404 simon@2ndQuadrant.co 3409 [ # # ]:UBC 0 : elog(ERROR, "CommitTransactionCommand: unexpected state %s",
3410 : : BlockStateAsString(s->blockState));
7978 tgl@sss.pgh.pa.us 3411 :CBC 503 : break;
3412 : :
3413 : : /*
3414 : : * The current already-failed subtransaction is ending due to a
3415 : : * ROLLBACK or ROLLBACK TO command, so pop it and recursively
3416 : : * examine the parent (which could be in any of several states).
3417 : : * As we need to examine the parent, return false to request the
3418 : : * caller to do the next iteration.
3419 : : */
747 akorotkov@postgresql 3420 : 55 : case TBLOCK_SUBABORT_END:
3421 : 55 : CleanupSubTransaction();
3422 : 55 : return false;
3423 : :
3424 : : /*
3425 : : * As above, but it's not dead yet, so abort first.
3426 : : */
3427 : 237 : case TBLOCK_SUBABORT_PENDING:
3428 : 237 : AbortSubTransaction();
3429 : 237 : CleanupSubTransaction();
3430 : 237 : return false;
3431 : :
3432 : : /*
3433 : : * The current subtransaction is the target of a ROLLBACK TO
3434 : : * command. Abort and pop it, then start a new subtransaction
3435 : : * with the same name.
3436 : : */
7901 tgl@sss.pgh.pa.us 3437 : 335 : case TBLOCK_SUBRESTART:
3438 : : {
3439 : : char *name;
3440 : : int savepointLevel;
3441 : :
3442 : : /* save name and keep Cleanup from freeing it */
3443 : 335 : name = s->name;
3444 : 335 : s->name = NULL;
3445 : 335 : savepointLevel = s->savepointLevel;
3446 : :
3447 : 335 : AbortSubTransaction();
3448 : 335 : CleanupSubTransaction();
3449 : :
3450 : 335 : DefineSavepoint(NULL);
3451 : 335 : s = CurrentTransactionState; /* changed by push */
3452 : 335 : s->name = name;
3453 : 335 : s->savepointLevel = savepointLevel;
3454 : :
3455 : : /* This is the same as TBLOCK_SUBBEGIN case */
1285 peter@eisentraut.org 3456 [ - + ]: 335 : Assert(s->blockState == TBLOCK_SUBBEGIN);
7952 tgl@sss.pgh.pa.us 3457 : 335 : StartSubTransaction();
3458 : 335 : s->blockState = TBLOCK_SUBINPROGRESS;
3459 : : }
7978 3460 : 335 : break;
3461 : :
3462 : : /*
3463 : : * Same as above, but the subtransaction had already failed, so we
3464 : : * don't need AbortSubTransaction.
3465 : : */
7901 3466 : 143 : case TBLOCK_SUBABORT_RESTART:
3467 : : {
3468 : : char *name;
3469 : : int savepointLevel;
3470 : :
3471 : : /* save name and keep Cleanup from freeing it */
3472 : 143 : name = s->name;
3473 : 143 : s->name = NULL;
3474 : 143 : savepointLevel = s->savepointLevel;
3475 : :
3476 : 143 : CleanupSubTransaction();
3477 : :
3478 : 143 : DefineSavepoint(NULL);
3479 : 143 : s = CurrentTransactionState; /* changed by push */
3480 : 143 : s->name = name;
3481 : 143 : s->savepointLevel = savepointLevel;
3482 : :
3483 : : /* This is the same as TBLOCK_SUBBEGIN case */
1285 peter@eisentraut.org 3484 [ - + ]: 143 : Assert(s->blockState == TBLOCK_SUBBEGIN);
7901 tgl@sss.pgh.pa.us 3485 : 143 : StartSubTransaction();
3486 : 143 : s->blockState = TBLOCK_SUBINPROGRESS;
3487 : : }
3488 : 143 : break;
3489 : : }
3490 : :
3491 : : /* Done, no more iterations required */
747 akorotkov@postgresql 3492 : 493279 : return true;
3493 : : }
3494 : :
3495 : : /*
3496 : : * AbortCurrentTransaction -- a wrapper function handling the
3497 : : * loop over subtransactions to avoid potentially dangerous recursion in
3498 : : * AbortCurrentTransactionInternal().
3499 : : */
3500 : : void
7978 tgl@sss.pgh.pa.us 3501 : 33994 : AbortCurrentTransaction(void)
3502 : : {
3503 : : /*
3504 : : * Repeatedly call AbortCurrentTransactionInternal() until all the work is
3505 : : * done.
3506 : : */
747 akorotkov@postgresql 3507 [ - + ]: 33994 : while (!AbortCurrentTransactionInternal())
3508 : : {
3509 : : }
788 3510 : 33994 : }
3511 : :
3512 : : /*
3513 : : * AbortCurrentTransactionInternal - a function doing an iteration of work
3514 : : * regarding handling the current transaction abort. In the case of
3515 : : * subtransactions more than one iterations could be required. Returns
3516 : : * true when no more iterations required, false otherwise.
3517 : : */
3518 : : static bool
3519 : 33994 : AbortCurrentTransactionInternal(void)
3520 : : {
7978 tgl@sss.pgh.pa.us 3521 : 33994 : TransactionState s = CurrentTransactionState;
3522 : :
3523 [ + + - + : 33994 : switch (s->blockState)
+ + - - +
+ - - - ]
3524 : : {
8065 bruce@momjian.us 3525 : 51 : case TBLOCK_DEFAULT:
7744 tgl@sss.pgh.pa.us 3526 [ - + ]: 51 : if (s->state == TRANS_DEFAULT)
3527 : : {
3528 : : /* we are idle, so nothing to do */
3529 : : }
3530 : : else
3531 : : {
3532 : : /*
3533 : : * We can get here after an error during transaction start
3534 : : * (state will be TRANS_START). Need to clean up the
3535 : : * incompletely started transaction. First, adjust the
3536 : : * low-level state to suppress warning message from
3537 : : * AbortTransaction.
3538 : : */
7744 tgl@sss.pgh.pa.us 3539 [ # # ]:UBC 0 : if (s->state == TRANS_START)
3540 : 0 : s->state = TRANS_INPROGRESS;
3541 : 0 : AbortTransaction();
3542 : 0 : CleanupTransaction();
3543 : : }
8065 bruce@momjian.us 3544 :CBC 51 : break;
3545 : :
3546 : : /*
3547 : : * If we aren't in a transaction block, we just do the basic abort
3548 : : * & cleanup transaction. For this purpose, we treat an implicit
3549 : : * transaction block as if it were a simple statement.
3550 : : */
3551 : 31453 : case TBLOCK_STARTED:
3552 : : case TBLOCK_IMPLICIT_INPROGRESS:
10466 3553 : 31453 : AbortTransaction();
8392 tgl@sss.pgh.pa.us 3554 : 31453 : CleanupTransaction();
8065 bruce@momjian.us 3555 : 31453 : s->blockState = TBLOCK_DEFAULT;
10466 3556 : 31453 : break;
3557 : :
3558 : : /*
3559 : : * If we are in TBLOCK_BEGIN it means something screwed up right
3560 : : * after reading "BEGIN TRANSACTION". We assume that the user
3561 : : * will interpret the error as meaning the BEGIN failed to get him
3562 : : * into a transaction block, so we should abort and return to idle
3563 : : * state.
3564 : : */
10466 bruce@momjian.us 3565 :UBC 0 : case TBLOCK_BEGIN:
3566 : 0 : AbortTransaction();
7901 tgl@sss.pgh.pa.us 3567 : 0 : CleanupTransaction();
3568 : 0 : s->blockState = TBLOCK_DEFAULT;
10466 bruce@momjian.us 3569 : 0 : break;
3570 : :
3571 : : /*
3572 : : * We are somewhere in a transaction block and we've gotten a
3573 : : * failure, so we abort the transaction and set up the persistent
3574 : : * ABORT state. We will stay in ABORT until we get a ROLLBACK.
3575 : : */
10466 bruce@momjian.us 3576 :CBC 925 : case TBLOCK_INPROGRESS:
3577 : : case TBLOCK_PARALLEL_INPROGRESS:
3578 : 925 : AbortTransaction();
8065 3579 : 925 : s->blockState = TBLOCK_ABORT;
3580 : : /* CleanupTransaction happens when we exit TBLOCK_ABORT_END */
10466 3581 : 925 : break;
3582 : :
3583 : : /*
3584 : : * Here, we failed while trying to COMMIT. Clean up the
3585 : : * transaction and return to idle state (we do not want to stay in
3586 : : * the transaction).
3587 : : */
3588 : 256 : case TBLOCK_END:
3589 : 256 : AbortTransaction();
9442 tgl@sss.pgh.pa.us 3590 : 256 : CleanupTransaction();
8065 bruce@momjian.us 3591 : 256 : s->blockState = TBLOCK_DEFAULT;
10466 3592 : 256 : break;
3593 : :
3594 : : /*
3595 : : * Here, we are already in an aborted transaction state and are
3596 : : * waiting for a ROLLBACK, but for some reason we failed again! So
3597 : : * we just remain in the abort state.
3598 : : */
3599 : 65 : case TBLOCK_ABORT:
3600 : : case TBLOCK_SUBABORT:
3601 : 65 : break;
3602 : :
3603 : : /*
3604 : : * We are in a failed transaction and we got the ROLLBACK command.
3605 : : * We have already aborted, we just need to cleanup and go to idle
3606 : : * state.
3607 : : */
7901 tgl@sss.pgh.pa.us 3608 :UBC 0 : case TBLOCK_ABORT_END:
9442 3609 : 0 : CleanupTransaction();
10466 bruce@momjian.us 3610 : 0 : s->blockState = TBLOCK_DEFAULT;
3611 : 0 : break;
3612 : :
3613 : : /*
3614 : : * We are in a live transaction and we got a ROLLBACK command.
3615 : : * Abort, cleanup, go to idle state.
3616 : : */
7901 tgl@sss.pgh.pa.us 3617 : 0 : case TBLOCK_ABORT_PENDING:
3618 : 0 : AbortTransaction();
3619 : 0 : CleanupTransaction();
3620 : 0 : s->blockState = TBLOCK_DEFAULT;
7978 3621 : 0 : break;
3622 : :
3623 : : /*
3624 : : * Here, we failed while trying to PREPARE. Clean up the
3625 : : * transaction and return to idle state (we do not want to stay in
3626 : : * the transaction).
3627 : : */
7627 tgl@sss.pgh.pa.us 3628 :CBC 64 : case TBLOCK_PREPARE:
3629 : 64 : AbortTransaction();
3630 : 64 : CleanupTransaction();
3631 : 64 : s->blockState = TBLOCK_DEFAULT;
3632 : 64 : break;
3633 : :
3634 : : /*
3635 : : * We got an error inside a subtransaction. Abort just the
3636 : : * subtransaction, and go to the persistent SUBABORT state until
3637 : : * we get ROLLBACK.
3638 : : */
7978 3639 : 1180 : case TBLOCK_SUBINPROGRESS:
3640 : 1180 : AbortSubTransaction();
3641 : 1180 : s->blockState = TBLOCK_SUBABORT;
3642 : 1180 : break;
3643 : :
3644 : : /*
3645 : : * If we failed while trying to create a subtransaction, clean up
3646 : : * the broken subtransaction and abort the parent. The same
3647 : : * applies if we get a failure while ending a subtransaction. As
3648 : : * we need to abort the parent, return false to request the caller
3649 : : * to do the next iteration.
3650 : : */
747 akorotkov@postgresql 3651 :UBC 0 : case TBLOCK_SUBBEGIN:
3652 : : case TBLOCK_SUBRELEASE:
3653 : : case TBLOCK_SUBCOMMIT:
3654 : : case TBLOCK_SUBABORT_PENDING:
3655 : : case TBLOCK_SUBRESTART:
3656 : 0 : AbortSubTransaction();
3657 : 0 : CleanupSubTransaction();
3658 : 0 : return false;
3659 : :
3660 : : /*
3661 : : * Same as above, except the Abort() was already done.
3662 : : */
3663 : 0 : case TBLOCK_SUBABORT_END:
3664 : : case TBLOCK_SUBABORT_RESTART:
3665 : 0 : CleanupSubTransaction();
3666 : 0 : return false;
3667 : : }
3668 : :
3669 : : /* Done, no more iterations required */
747 akorotkov@postgresql 3670 :CBC 33994 : return true;
3671 : : }
3672 : :
3673 : : /*
3674 : : * PreventInTransactionBlock
3675 : : *
3676 : : * This routine is to be called by statements that must not run inside
3677 : : * a transaction block, typically because they have non-rollback-able
3678 : : * side effects or do internal commits.
3679 : : *
3680 : : * If this routine completes successfully, then the calling statement is
3681 : : * guaranteed that if it completes without error, its results will be
3682 : : * committed immediately.
3683 : : *
3684 : : * If we have already started a transaction block, issue an error; also issue
3685 : : * an error if we appear to be running inside a user-defined function (which
3686 : : * could issue more commands and possibly cause a failure after the statement
3687 : : * completes). Subtransactions are verboten too.
3688 : : *
3689 : : * We must also set XACT_FLAGS_NEEDIMMEDIATECOMMIT in MyXactFlags, to ensure
3690 : : * that postgres.c follows through by committing after the statement is done.
3691 : : *
3692 : : * isTopLevel: passed down from ProcessUtility to determine whether we are
3693 : : * inside a function. (We will always fail if this is false, but it's
3694 : : * convenient to centralize the check here instead of making callers do it.)
3695 : : * stmtType: statement type name, for error messages.
3696 : : */
3697 : : void
3000 peter_e@gmx.net 3698 : 9055 : PreventInTransactionBlock(bool isTopLevel, const char *stmtType)
3699 : : {
3700 : : /*
3701 : : * xact block already started?
3702 : : */
8597 tgl@sss.pgh.pa.us 3703 [ + + ]: 9055 : if (IsTransactionBlock())
8324 3704 [ + - ]: 78 : ereport(ERROR,
3705 : : (errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
3706 : : /* translator: %s represents an SQL statement name */
3707 : : errmsg("%s cannot run inside a transaction block",
3708 : : stmtType)));
3709 : :
3710 : : /*
3711 : : * subtransaction?
3712 : : */
7978 3713 [ - + ]: 8977 : if (IsSubTransaction())
7978 tgl@sss.pgh.pa.us 3714 [ # # ]:UBC 0 : ereport(ERROR,
3715 : : (errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
3716 : : /* translator: %s represents an SQL statement name */
3717 : : errmsg("%s cannot run inside a subtransaction",
3718 : : stmtType)));
3719 : :
3720 : : /*
3721 : : * inside a function call?
3722 : : */
6993 tgl@sss.pgh.pa.us 3723 [ + + ]:CBC 8977 : if (!isTopLevel)
8324 3724 [ + - ]: 4 : ereport(ERROR,
3725 : : (errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
3726 : : /* translator: %s represents an SQL statement name */
3727 : : errmsg("%s cannot be executed from a function or procedure",
3728 : : stmtType)));
3729 : :
3730 : : /* If we got past IsTransactionBlock test, should be in default state */
8065 bruce@momjian.us 3731 [ + + ]: 8973 : if (CurrentTransactionState->blockState != TBLOCK_DEFAULT &&
8018 tgl@sss.pgh.pa.us 3732 [ - + ]: 7995 : CurrentTransactionState->blockState != TBLOCK_STARTED)
7978 tgl@sss.pgh.pa.us 3733 [ # # ]:UBC 0 : elog(FATAL, "cannot prevent transaction chain");
3734 : :
3735 : : /* All okay. Set the flag to make sure the right thing happens later. */
1379 tgl@sss.pgh.pa.us 3736 :CBC 8973 : MyXactFlags |= XACT_FLAGS_NEEDIMMEDIATECOMMIT;
8597 3737 : 8973 : }
3738 : :
3739 : : /*
3740 : : * WarnNoTransactionBlock
3741 : : * RequireTransactionBlock
3742 : : *
3743 : : * These two functions allow for warnings or errors if a command is executed
3744 : : * outside of a transaction block. This is useful for commands that have no
3745 : : * effects that persist past transaction end (and so calling them outside a
3746 : : * transaction block is presumably an error). DECLARE CURSOR is an example.
3747 : : * While top-level transaction control commands (BEGIN/COMMIT/ABORT) and SET
3748 : : * that have no effect issue warnings, all other no-effect commands generate
3749 : : * errors.
3750 : : *
3751 : : * If we appear to be running inside a user-defined function, we do not
3752 : : * issue anything, since the function could issue more commands that make
3753 : : * use of the current statement's results. Likewise subtransactions.
3754 : : * Thus these are inverses for PreventInTransactionBlock.
3755 : : *
3756 : : * isTopLevel: passed down from ProcessUtility to determine whether we are
3757 : : * inside a function.
3758 : : * stmtType: statement type name, for warning or error messages.
3759 : : */
3760 : : void
3000 peter_e@gmx.net 3761 : 1480 : WarnNoTransactionBlock(bool isTopLevel, const char *stmtType)
3762 : : {
3763 : 1480 : CheckTransactionBlock(isTopLevel, false, stmtType);
4544 bruce@momjian.us 3764 : 1480 : }
3765 : :
3766 : : void
3000 peter_e@gmx.net 3767 : 5066 : RequireTransactionBlock(bool isTopLevel, const char *stmtType)
3768 : : {
3769 : 5066 : CheckTransactionBlock(isTopLevel, true, stmtType);
4544 bruce@momjian.us 3770 : 5043 : }
3771 : :
3772 : : /*
3773 : : * This is the implementation of the above two.
3774 : : */
3775 : : static void
3000 peter_e@gmx.net 3776 : 6546 : CheckTransactionBlock(bool isTopLevel, bool throwError, const char *stmtType)
3777 : : {
3778 : : /*
3779 : : * xact block already started?
3780 : : */
8569 tgl@sss.pgh.pa.us 3781 [ + + ]: 6546 : if (IsTransactionBlock())
3782 : 6427 : return;
3783 : :
3784 : : /*
3785 : : * subtransaction?
3786 : : */
7978 3787 [ - + ]: 119 : if (IsSubTransaction())
7978 tgl@sss.pgh.pa.us 3788 :UBC 0 : return;
3789 : :
3790 : : /*
3791 : : * inside a function call?
3792 : : */
6993 tgl@sss.pgh.pa.us 3793 [ + + ]:CBC 119 : if (!isTopLevel)
8569 3794 : 82 : return;
3795 : :
4544 bruce@momjian.us 3796 [ + + + - ]: 37 : ereport(throwError ? ERROR : WARNING,
3797 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
3798 : : /* translator: %s represents an SQL statement name */
3799 : : errmsg("%s can only be used in transaction blocks",
3800 : : stmtType)));
3801 : : }
3802 : :
3803 : : /*
3804 : : * IsInTransactionBlock
3805 : : *
3806 : : * This routine is for statements that need to behave differently inside
3807 : : * a transaction block than when running as single commands. ANALYZE is
3808 : : * currently the only example.
3809 : : *
3810 : : * If this routine returns "false", then the calling statement is allowed
3811 : : * to perform internal transaction-commit-and-start cycles; there is not a
3812 : : * risk of messing up any transaction already in progress. (Note that this
3813 : : * is not the identical guarantee provided by PreventInTransactionBlock,
3814 : : * since we will not force a post-statement commit.)
3815 : : *
3816 : : * isTopLevel: passed down from ProcessUtility to determine whether we are
3817 : : * inside a function.
3818 : : */
3819 : : bool
3000 peter_e@gmx.net 3820 : 3204 : IsInTransactionBlock(bool isTopLevel)
3821 : : {
3822 : : /*
3823 : : * Return true on same conditions that would make
3824 : : * PreventInTransactionBlock error out
3825 : : */
8018 tgl@sss.pgh.pa.us 3826 [ + + ]: 3204 : if (IsTransactionBlock())
3827 : 98 : return true;
3828 : :
7978 3829 [ - + ]: 3106 : if (IsSubTransaction())
7978 tgl@sss.pgh.pa.us 3830 :UBC 0 : return true;
3831 : :
6993 tgl@sss.pgh.pa.us 3832 [ + + ]:CBC 3106 : if (!isTopLevel)
8018 3833 : 74 : return true;
3834 : :
3835 [ + - ]: 3032 : if (CurrentTransactionState->blockState != TBLOCK_DEFAULT &&
3836 [ - + ]: 3032 : CurrentTransactionState->blockState != TBLOCK_STARTED)
8018 tgl@sss.pgh.pa.us 3837 :UBC 0 : return true;
3838 : :
8018 tgl@sss.pgh.pa.us 3839 :CBC 3032 : return false;
3840 : : }
3841 : :
3842 : :
3843 : : /*
3844 : : * Register or deregister callback functions for start- and end-of-xact
3845 : : * operations.
3846 : : *
3847 : : * These functions are intended for use by dynamically loaded modules.
3848 : : * For built-in modules we generally just hardwire the appropriate calls
3849 : : * (mainly because it's easier to control the order that way, where needed).
3850 : : *
3851 : : * At transaction end, the callback occurs post-commit or post-abort, so the
3852 : : * callback functions can only do noncritical cleanup.
3853 : : */
3854 : : void
7947 3855 : 2652 : RegisterXactCallback(XactCallback callback, void *arg)
3856 : : {
3857 : : XactCallbackItem *item;
3858 : :
3859 : : item = (XactCallbackItem *)
3860 : 2652 : MemoryContextAlloc(TopMemoryContext, sizeof(XactCallbackItem));
8255 3861 : 2652 : item->callback = callback;
3862 : 2652 : item->arg = arg;
7947 3863 : 2652 : item->next = Xact_callbacks;
3864 : 2652 : Xact_callbacks = item;
8255 3865 : 2652 : }
3866 : :
3867 : : void
7947 tgl@sss.pgh.pa.us 3868 :UBC 0 : UnregisterXactCallback(XactCallback callback, void *arg)
3869 : : {
3870 : : XactCallbackItem *item;
3871 : : XactCallbackItem *prev;
3872 : :
8255 3873 : 0 : prev = NULL;
7947 3874 [ # # ]: 0 : for (item = Xact_callbacks; item; prev = item, item = item->next)
3875 : : {
8255 3876 [ # # # # ]: 0 : if (item->callback == callback && item->arg == arg)
3877 : : {
3878 [ # # ]: 0 : if (prev)
3879 : 0 : prev->next = item->next;
3880 : : else
7947 3881 : 0 : Xact_callbacks = item->next;
8255 3882 : 0 : pfree(item);
3883 : 0 : break;
3884 : : }
3885 : : }
3886 : 0 : }
3887 : :
3888 : : static void
7901 tgl@sss.pgh.pa.us 3889 :CBC 808630 : CallXactCallbacks(XactEvent event)
3890 : : {
3891 : : XactCallbackItem *item;
3892 : : XactCallbackItem *next;
3893 : :
1315 3894 [ + + ]: 1091758 : for (item = Xact_callbacks; item; item = next)
3895 : : {
3896 : : /* allow callbacks to unregister themselves when called */
3897 : 283129 : next = item->next;
3162 peter_e@gmx.net 3898 : 283129 : item->callback(event, item->arg);
3899 : : }
7901 tgl@sss.pgh.pa.us 3900 : 808629 : }
3901 : :
3902 : :
3903 : : /*
3904 : : * Register or deregister callback functions for start- and end-of-subxact
3905 : : * operations.
3906 : : *
3907 : : * Pretty much same as above, but for subtransaction events.
3908 : : *
3909 : : * At subtransaction end, the callback occurs post-subcommit or post-subabort,
3910 : : * so the callback functions can only do noncritical cleanup. At
3911 : : * subtransaction start, the callback is called when the subtransaction has
3912 : : * finished initializing.
3913 : : */
3914 : : void
3915 : 2652 : RegisterSubXactCallback(SubXactCallback callback, void *arg)
3916 : : {
3917 : : SubXactCallbackItem *item;
3918 : :
3919 : : item = (SubXactCallbackItem *)
3920 : 2652 : MemoryContextAlloc(TopMemoryContext, sizeof(SubXactCallbackItem));
3921 : 2652 : item->callback = callback;
3922 : 2652 : item->arg = arg;
3923 : 2652 : item->next = SubXact_callbacks;
3924 : 2652 : SubXact_callbacks = item;
3925 : 2652 : }
3926 : :
3927 : : void
7901 tgl@sss.pgh.pa.us 3928 :UBC 0 : UnregisterSubXactCallback(SubXactCallback callback, void *arg)
3929 : : {
3930 : : SubXactCallbackItem *item;
3931 : : SubXactCallbackItem *prev;
3932 : :
3933 : 0 : prev = NULL;
3934 [ # # ]: 0 : for (item = SubXact_callbacks; item; prev = item, item = item->next)
3935 : : {
3936 [ # # # # ]: 0 : if (item->callback == callback && item->arg == arg)
3937 : : {
3938 [ # # ]: 0 : if (prev)
3939 : 0 : prev->next = item->next;
3940 : : else
3941 : 0 : SubXact_callbacks = item->next;
3942 : 0 : pfree(item);
3943 : 0 : break;
3944 : : }
3945 : : }
3946 : 0 : }
3947 : :
3948 : : static void
7901 tgl@sss.pgh.pa.us 3949 :CBC 32558 : CallSubXactCallbacks(SubXactEvent event,
3950 : : SubTransactionId mySubid,
3951 : : SubTransactionId parentSubid)
3952 : : {
3953 : : SubXactCallbackItem *item;
3954 : : SubXactCallbackItem *next;
3955 : :
1315 3956 [ + + ]: 59500 : for (item = SubXact_callbacks; item; item = next)
3957 : : {
3958 : : /* allow callbacks to unregister themselves when called */
3959 : 26942 : next = item->next;
3162 peter_e@gmx.net 3960 : 26942 : item->callback(event, mySubid, parentSubid, item->arg);
3961 : : }
8255 tgl@sss.pgh.pa.us 3962 : 32558 : }
3963 : :
3964 : :
3965 : : /* ----------------------------------------------------------------
3966 : : * transaction block support
3967 : : * ----------------------------------------------------------------
3968 : : */
3969 : :
3970 : : /*
3971 : : * BeginTransactionBlock
3972 : : * This executes a BEGIN command.
3973 : : */
3974 : : void
10467 bruce@momjian.us 3975 : 12617 : BeginTransactionBlock(void)
3976 : : {
3977 : 12617 : TransactionState s = CurrentTransactionState;
3978 : :
7952 tgl@sss.pgh.pa.us 3979 [ + + - - : 12617 : switch (s->blockState)
- ]
3980 : : {
3981 : : /*
3982 : : * We are not inside a transaction block, so allow one to begin.
3983 : : */
8065 bruce@momjian.us 3984 : 12116 : case TBLOCK_STARTED:
3985 : 12116 : s->blockState = TBLOCK_BEGIN;
3986 : 12116 : break;
3987 : :
3988 : : /*
3989 : : * BEGIN converts an implicit transaction block to a regular one.
3990 : : * (Note that we allow this even if we've already done some
3991 : : * commands, which is a bit odd but matches historical practice.)
3992 : : */
3162 tgl@sss.pgh.pa.us 3993 : 501 : case TBLOCK_IMPLICIT_INPROGRESS:
3994 : 501 : s->blockState = TBLOCK_BEGIN;
3995 : 501 : break;
3996 : :
3997 : : /*
3998 : : * Already a transaction block in progress.
3999 : : */
8065 bruce@momjian.us 4000 :UBC 0 : case TBLOCK_INPROGRESS:
4001 : : case TBLOCK_PARALLEL_INPROGRESS:
4002 : : case TBLOCK_SUBINPROGRESS:
4003 : : case TBLOCK_ABORT:
4004 : : case TBLOCK_SUBABORT:
7952 tgl@sss.pgh.pa.us 4005 [ # # ]: 0 : ereport(WARNING,
4006 : : (errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
4007 : : errmsg("there is already a transaction in progress")));
8065 bruce@momjian.us 4008 : 0 : break;
4009 : :
4010 : : /* These cases are invalid. */
4011 : 0 : case TBLOCK_DEFAULT:
4012 : : case TBLOCK_BEGIN:
4013 : : case TBLOCK_SUBBEGIN:
4014 : : case TBLOCK_END:
4015 : : case TBLOCK_SUBRELEASE:
4016 : : case TBLOCK_SUBCOMMIT:
4017 : : case TBLOCK_ABORT_END:
4018 : : case TBLOCK_SUBABORT_END:
4019 : : case TBLOCK_ABORT_PENDING:
4020 : : case TBLOCK_SUBABORT_PENDING:
4021 : : case TBLOCK_SUBRESTART:
4022 : : case TBLOCK_SUBABORT_RESTART:
4023 : : case TBLOCK_PREPARE:
7978 tgl@sss.pgh.pa.us 4024 [ # # ]: 0 : elog(FATAL, "BeginTransactionBlock: unexpected state %s",
4025 : : BlockStateAsString(s->blockState));
4026 : : break;
4027 : : }
10892 scrappy@hub.org 4028 :CBC 12617 : }
4029 : :
4030 : : /*
4031 : : * PrepareTransactionBlock
4032 : : * This executes a PREPARE command.
4033 : : *
4034 : : * Since PREPARE may actually do a ROLLBACK, the result indicates what
4035 : : * happened: true for PREPARE, false for ROLLBACK.
4036 : : *
4037 : : * Note that we don't actually do anything here except change blockState.
4038 : : * The real work will be done in the upcoming PrepareTransaction().
4039 : : * We do it this way because it's not convenient to change memory context,
4040 : : * resource owner, etc while executing inside a Portal.
4041 : : */
4042 : : bool
3108 peter_e@gmx.net 4043 : 363 : PrepareTransactionBlock(const char *gid)
4044 : : {
4045 : : TransactionState s;
4046 : : bool result;
4047 : :
4048 : : /* Set up to commit the current transaction */
2599 peter@eisentraut.org 4049 : 363 : result = EndTransactionBlock(false);
4050 : :
4051 : : /* If successful, change outer tblock state to PREPARE */
7627 tgl@sss.pgh.pa.us 4052 [ + + ]: 363 : if (result)
4053 : : {
4054 : 361 : s = CurrentTransactionState;
4055 : :
4056 [ + + ]: 474 : while (s->parent != NULL)
4057 : 113 : s = s->parent;
4058 : :
4059 [ + - ]: 361 : if (s->blockState == TBLOCK_END)
4060 : : {
4061 : : /* Save GID where PrepareTransaction can find it again */
4062 : 361 : prepareGID = MemoryContextStrdup(TopTransactionContext, gid);
4063 : :
4064 : 361 : s->blockState = TBLOCK_PREPARE;
4065 : : }
4066 : : else
4067 : : {
4068 : : /*
4069 : : * ignore case where we are not in a transaction;
4070 : : * EndTransactionBlock already issued a warning.
4071 : : */
3162 tgl@sss.pgh.pa.us 4072 [ # # # # ]:UBC 0 : Assert(s->blockState == TBLOCK_STARTED ||
4073 : : s->blockState == TBLOCK_IMPLICIT_INPROGRESS);
4074 : : /* Don't send back a PREPARE result tag... */
7627 4075 : 0 : result = false;
4076 : : }
4077 : : }
4078 : :
7627 tgl@sss.pgh.pa.us 4079 :CBC 363 : return result;
4080 : : }
4081 : :
4082 : : /*
4083 : : * EndTransactionBlock
4084 : : * This executes a COMMIT command.
4085 : : *
4086 : : * Since COMMIT may actually do a ROLLBACK, the result indicates what
4087 : : * happened: true for COMMIT, false for ROLLBACK.
4088 : : *
4089 : : * Note that we don't actually do anything here except change blockState.
4090 : : * The real work will be done in the upcoming CommitTransactionCommand().
4091 : : * We do it this way because it's not convenient to change memory context,
4092 : : * resource owner, etc while executing inside a Portal.
4093 : : */
4094 : : bool
2599 peter@eisentraut.org 4095 : 10176 : EndTransactionBlock(bool chain)
4096 : : {
10467 bruce@momjian.us 4097 : 10176 : TransactionState s = CurrentTransactionState;
7952 tgl@sss.pgh.pa.us 4098 : 10176 : bool result = false;
4099 : :
4100 [ + + + + : 10176 : switch (s->blockState)
+ + - -
- ]
4101 : : {
4102 : : /*
4103 : : * We are in a transaction block, so tell CommitTransactionCommand
4104 : : * to COMMIT.
4105 : : */
8065 bruce@momjian.us 4106 : 9094 : case TBLOCK_INPROGRESS:
7952 tgl@sss.pgh.pa.us 4107 : 9094 : s->blockState = TBLOCK_END;
4108 : 9094 : result = true;
7978 4109 : 9094 : break;
4110 : :
4111 : : /*
4112 : : * We are in an implicit transaction block. If AND CHAIN was
4113 : : * specified, error. Otherwise commit, but issue a warning
4114 : : * because there was no explicit BEGIN before this.
4115 : : */
3162 4116 : 32 : case TBLOCK_IMPLICIT_INPROGRESS:
2431 peter@eisentraut.org 4117 [ + + ]: 32 : if (chain)
4118 [ + - ]: 16 : ereport(ERROR,
4119 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4120 : : /* translator: %s represents an SQL statement name */
4121 : : errmsg("%s can only be used in transaction blocks",
4122 : : "COMMIT AND CHAIN")));
4123 : : else
4124 [ + - ]: 16 : ereport(WARNING,
4125 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4126 : : errmsg("there is no transaction in progress")));
3162 tgl@sss.pgh.pa.us 4127 : 16 : s->blockState = TBLOCK_END;
4128 : 16 : result = true;
4129 : 16 : break;
4130 : :
4131 : : /*
4132 : : * We are in a failed transaction block. Tell
4133 : : * CommitTransactionCommand it's time to exit the block.
4134 : : */
8065 bruce@momjian.us 4135 : 474 : case TBLOCK_ABORT:
7901 tgl@sss.pgh.pa.us 4136 : 474 : s->blockState = TBLOCK_ABORT_END;
8065 bruce@momjian.us 4137 : 474 : break;
4138 : :
4139 : : /*
4140 : : * We are in a live subtransaction block. Set up to subcommit all
4141 : : * open subtransactions and then commit the main transaction.
4142 : : */
7907 tgl@sss.pgh.pa.us 4143 : 522 : case TBLOCK_SUBINPROGRESS:
4144 [ + + ]: 1133 : while (s->parent != NULL)
4145 : : {
7901 4146 [ + - ]: 611 : if (s->blockState == TBLOCK_SUBINPROGRESS)
5404 simon@2ndQuadrant.co 4147 : 611 : s->blockState = TBLOCK_SUBCOMMIT;
4148 : : else
7901 tgl@sss.pgh.pa.us 4149 [ # # ]:UBC 0 : elog(FATAL, "EndTransactionBlock: unexpected state %s",
4150 : : BlockStateAsString(s->blockState));
7907 tgl@sss.pgh.pa.us 4151 :CBC 611 : s = s->parent;
4152 : : }
7901 4153 [ + - ]: 522 : if (s->blockState == TBLOCK_INPROGRESS)
4154 : 522 : s->blockState = TBLOCK_END;
4155 : : else
7901 tgl@sss.pgh.pa.us 4156 [ # # ]:UBC 0 : elog(FATAL, "EndTransactionBlock: unexpected state %s",
4157 : : BlockStateAsString(s->blockState));
7907 tgl@sss.pgh.pa.us 4158 :CBC 522 : result = true;
4159 : 522 : break;
4160 : :
4161 : : /*
4162 : : * Here we are inside an aborted subtransaction. Treat the COMMIT
4163 : : * as ROLLBACK: set up to abort everything and exit the main
4164 : : * transaction.
4165 : : */
7978 4166 : 38 : case TBLOCK_SUBABORT:
7901 4167 [ + + ]: 76 : while (s->parent != NULL)
4168 : : {
4169 [ - + ]: 38 : if (s->blockState == TBLOCK_SUBINPROGRESS)
7901 tgl@sss.pgh.pa.us 4170 :UBC 0 : s->blockState = TBLOCK_SUBABORT_PENDING;
7901 tgl@sss.pgh.pa.us 4171 [ + - ]:CBC 38 : else if (s->blockState == TBLOCK_SUBABORT)
4172 : 38 : s->blockState = TBLOCK_SUBABORT_END;
4173 : : else
7901 tgl@sss.pgh.pa.us 4174 [ # # ]:UBC 0 : elog(FATAL, "EndTransactionBlock: unexpected state %s",
4175 : : BlockStateAsString(s->blockState));
7901 tgl@sss.pgh.pa.us 4176 :CBC 38 : s = s->parent;
4177 : : }
4178 [ + - ]: 38 : if (s->blockState == TBLOCK_INPROGRESS)
4179 : 38 : s->blockState = TBLOCK_ABORT_PENDING;
7901 tgl@sss.pgh.pa.us 4180 [ # # ]:UBC 0 : else if (s->blockState == TBLOCK_ABORT)
4181 : 0 : s->blockState = TBLOCK_ABORT_END;
4182 : : else
4183 [ # # ]: 0 : elog(FATAL, "EndTransactionBlock: unexpected state %s",
4184 : : BlockStateAsString(s->blockState));
7978 tgl@sss.pgh.pa.us 4185 :CBC 38 : break;
4186 : :
4187 : : /*
4188 : : * The user issued COMMIT when not inside a transaction. For
4189 : : * COMMIT without CHAIN, issue a WARNING, staying in
4190 : : * TBLOCK_STARTED state. The upcoming call to
4191 : : * CommitTransactionCommand() will then close the transaction and
4192 : : * put us back into the default state. For COMMIT AND CHAIN,
4193 : : * error.
4194 : : */
7901 4195 : 16 : case TBLOCK_STARTED:
2431 peter@eisentraut.org 4196 [ + + ]: 16 : if (chain)
4197 [ + - ]: 4 : ereport(ERROR,
4198 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4199 : : /* translator: %s represents an SQL statement name */
4200 : : errmsg("%s can only be used in transaction blocks",
4201 : : "COMMIT AND CHAIN")));
4202 : : else
4203 [ + - ]: 12 : ereport(WARNING,
4204 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4205 : : errmsg("there is no transaction in progress")));
7857 tgl@sss.pgh.pa.us 4206 : 12 : result = true;
8065 bruce@momjian.us 4207 : 12 : break;
4208 : :
4209 : : /*
4210 : : * The user issued a COMMIT that somehow ran inside a parallel
4211 : : * worker. We can't cope with that.
4212 : : */
4023 rhaas@postgresql.org 4213 :UBC 0 : case TBLOCK_PARALLEL_INPROGRESS:
4214 [ # # ]: 0 : ereport(FATAL,
4215 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
4216 : : errmsg("cannot commit during a parallel operation")));
4217 : : break;
4218 : :
4219 : : /* These cases are invalid. */
8065 bruce@momjian.us 4220 : 0 : case TBLOCK_DEFAULT:
4221 : : case TBLOCK_BEGIN:
4222 : : case TBLOCK_SUBBEGIN:
4223 : : case TBLOCK_END:
4224 : : case TBLOCK_SUBRELEASE:
4225 : : case TBLOCK_SUBCOMMIT:
4226 : : case TBLOCK_ABORT_END:
4227 : : case TBLOCK_SUBABORT_END:
4228 : : case TBLOCK_ABORT_PENDING:
4229 : : case TBLOCK_SUBABORT_PENDING:
4230 : : case TBLOCK_SUBRESTART:
4231 : : case TBLOCK_SUBABORT_RESTART:
4232 : : case TBLOCK_PREPARE:
7978 tgl@sss.pgh.pa.us 4233 [ # # ]: 0 : elog(FATAL, "EndTransactionBlock: unexpected state %s",
4234 : : BlockStateAsString(s->blockState));
4235 : : break;
4236 : : }
4237 : :
2599 peter@eisentraut.org 4238 [ + + + + :CBC 10156 : Assert(s->blockState == TBLOCK_STARTED ||
+ + - + ]
4239 : : s->blockState == TBLOCK_END ||
4240 : : s->blockState == TBLOCK_ABORT_END ||
4241 : : s->blockState == TBLOCK_ABORT_PENDING);
4242 : :
4243 : 10156 : s->chain = chain;
4244 : :
7952 tgl@sss.pgh.pa.us 4245 : 10156 : return result;
4246 : : }
4247 : :
4248 : : /*
4249 : : * UserAbortTransactionBlock
4250 : : * This executes a ROLLBACK command.
4251 : : *
4252 : : * As above, we don't actually do anything here except change blockState.
4253 : : */
4254 : : void
2599 peter@eisentraut.org 4255 : 2202 : UserAbortTransactionBlock(bool chain)
4256 : : {
10467 bruce@momjian.us 4257 : 2202 : TransactionState s = CurrentTransactionState;
4258 : :
7952 tgl@sss.pgh.pa.us 4259 [ + + + + : 2202 : switch (s->blockState)
- - - ]
4260 : : {
4261 : : /*
4262 : : * We are inside a transaction block and we got a ROLLBACK command
4263 : : * from the user, so tell CommitTransactionCommand to abort and
4264 : : * exit the transaction block.
4265 : : */
7901 4266 : 1638 : case TBLOCK_INPROGRESS:
4267 : 1638 : s->blockState = TBLOCK_ABORT_PENDING;
7978 4268 : 1638 : break;
4269 : :
4270 : : /*
4271 : : * We are inside a failed transaction block and we got a ROLLBACK
4272 : : * command from the user. Abort processing is already done, so
4273 : : * CommitTransactionCommand just has to cleanup and go back to
4274 : : * idle state.
4275 : : */
7901 4276 : 437 : case TBLOCK_ABORT:
4277 : 437 : s->blockState = TBLOCK_ABORT_END;
7978 4278 : 437 : break;
4279 : :
4280 : : /*
4281 : : * We are inside a subtransaction. Mark everything up to top
4282 : : * level as exitable.
4283 : : */
4284 : 76 : case TBLOCK_SUBINPROGRESS:
4285 : : case TBLOCK_SUBABORT:
7901 4286 [ + + ]: 292 : while (s->parent != NULL)
4287 : : {
4288 [ + + ]: 216 : if (s->blockState == TBLOCK_SUBINPROGRESS)
4289 : 199 : s->blockState = TBLOCK_SUBABORT_PENDING;
4290 [ + - ]: 17 : else if (s->blockState == TBLOCK_SUBABORT)
4291 : 17 : s->blockState = TBLOCK_SUBABORT_END;
4292 : : else
7901 tgl@sss.pgh.pa.us 4293 [ # # ]:UBC 0 : elog(FATAL, "UserAbortTransactionBlock: unexpected state %s",
4294 : : BlockStateAsString(s->blockState));
7901 tgl@sss.pgh.pa.us 4295 :CBC 216 : s = s->parent;
4296 : : }
4297 [ + - ]: 76 : if (s->blockState == TBLOCK_INPROGRESS)
4298 : 76 : s->blockState = TBLOCK_ABORT_PENDING;
7901 tgl@sss.pgh.pa.us 4299 [ # # ]:UBC 0 : else if (s->blockState == TBLOCK_ABORT)
4300 : 0 : s->blockState = TBLOCK_ABORT_END;
4301 : : else
4302 [ # # ]: 0 : elog(FATAL, "UserAbortTransactionBlock: unexpected state %s",
4303 : : BlockStateAsString(s->blockState));
7978 tgl@sss.pgh.pa.us 4304 :CBC 76 : break;
4305 : :
4306 : : /*
4307 : : * The user issued ABORT when not inside a transaction. For
4308 : : * ROLLBACK without CHAIN, issue a WARNING and go to abort state.
4309 : : * The upcoming call to CommitTransactionCommand() will then put
4310 : : * us back into the default state. For ROLLBACK AND CHAIN, error.
4311 : : *
4312 : : * We do the same thing with ABORT inside an implicit transaction,
4313 : : * although in this case we might be rolling back actual database
4314 : : * state changes. (It's debatable whether we should issue a
4315 : : * WARNING in this case, but we have done so historically.)
4316 : : */
4317 : 51 : case TBLOCK_STARTED:
4318 : : case TBLOCK_IMPLICIT_INPROGRESS:
2431 peter@eisentraut.org 4319 [ + + ]: 51 : if (chain)
4320 [ + - ]: 20 : ereport(ERROR,
4321 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4322 : : /* translator: %s represents an SQL statement name */
4323 : : errmsg("%s can only be used in transaction blocks",
4324 : : "ROLLBACK AND CHAIN")));
4325 : : else
4326 [ + - ]: 31 : ereport(WARNING,
4327 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4328 : : errmsg("there is no transaction in progress")));
7901 tgl@sss.pgh.pa.us 4329 : 31 : s->blockState = TBLOCK_ABORT_PENDING;
7978 4330 : 31 : break;
4331 : :
4332 : : /*
4333 : : * The user issued an ABORT that somehow ran inside a parallel
4334 : : * worker. We can't cope with that.
4335 : : */
4023 rhaas@postgresql.org 4336 :UBC 0 : case TBLOCK_PARALLEL_INPROGRESS:
4337 [ # # ]: 0 : ereport(FATAL,
4338 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
4339 : : errmsg("cannot abort during a parallel operation")));
4340 : : break;
4341 : :
4342 : : /* These cases are invalid. */
7978 tgl@sss.pgh.pa.us 4343 : 0 : case TBLOCK_DEFAULT:
4344 : : case TBLOCK_BEGIN:
4345 : : case TBLOCK_SUBBEGIN:
4346 : : case TBLOCK_END:
4347 : : case TBLOCK_SUBRELEASE:
4348 : : case TBLOCK_SUBCOMMIT:
4349 : : case TBLOCK_ABORT_END:
4350 : : case TBLOCK_SUBABORT_END:
4351 : : case TBLOCK_ABORT_PENDING:
4352 : : case TBLOCK_SUBABORT_PENDING:
4353 : : case TBLOCK_SUBRESTART:
4354 : : case TBLOCK_SUBABORT_RESTART:
4355 : : case TBLOCK_PREPARE:
4356 [ # # ]: 0 : elog(FATAL, "UserAbortTransactionBlock: unexpected state %s",
4357 : : BlockStateAsString(s->blockState));
4358 : : break;
4359 : : }
4360 : :
2599 peter@eisentraut.org 4361 [ + + - + ]:CBC 2182 : Assert(s->blockState == TBLOCK_ABORT_END ||
4362 : : s->blockState == TBLOCK_ABORT_PENDING);
4363 : :
4364 : 2182 : s->chain = chain;
7952 tgl@sss.pgh.pa.us 4365 : 2182 : }
4366 : :
4367 : : /*
4368 : : * BeginImplicitTransactionBlock
4369 : : * Start an implicit transaction block if we're not already in one.
4370 : : *
4371 : : * Unlike BeginTransactionBlock, this is called directly from the main loop
4372 : : * in postgres.c, not within a Portal. So we can just change blockState
4373 : : * without a lot of ceremony. We do not expect caller to do
4374 : : * CommitTransactionCommand/StartTransactionCommand.
4375 : : */
4376 : : void
3162 4377 : 46465 : BeginImplicitTransactionBlock(void)
4378 : : {
4379 : 46465 : TransactionState s = CurrentTransactionState;
4380 : :
4381 : : /*
4382 : : * If we are in STARTED state (that is, no transaction block is open),
4383 : : * switch to IMPLICIT_INPROGRESS state, creating an implicit transaction
4384 : : * block.
4385 : : *
4386 : : * For caller convenience, we consider all other transaction states as
4387 : : * legal here; otherwise the caller would need its own state check, which
4388 : : * seems rather pointless.
4389 : : */
4390 [ + + ]: 46465 : if (s->blockState == TBLOCK_STARTED)
4391 : 5996 : s->blockState = TBLOCK_IMPLICIT_INPROGRESS;
4392 : 46465 : }
4393 : :
4394 : : /*
4395 : : * EndImplicitTransactionBlock
4396 : : * End an implicit transaction block, if we're in one.
4397 : : *
4398 : : * Like EndTransactionBlock, we just make any needed blockState change here.
4399 : : * The real work will be done in the upcoming CommitTransactionCommand().
4400 : : */
4401 : : void
4402 : 17428 : EndImplicitTransactionBlock(void)
4403 : : {
4404 : 17428 : TransactionState s = CurrentTransactionState;
4405 : :
4406 : : /*
4407 : : * If we are in IMPLICIT_INPROGRESS state, switch back to STARTED state,
4408 : : * allowing CommitTransactionCommand to commit whatever happened during
4409 : : * the implicit transaction block as though it were a single statement.
4410 : : *
4411 : : * For caller convenience, we consider all other transaction states as
4412 : : * legal here; otherwise the caller would need its own state check, which
4413 : : * seems rather pointless.
4414 : : */
4415 [ + + ]: 17428 : if (s->blockState == TBLOCK_IMPLICIT_INPROGRESS)
4416 : 5383 : s->blockState = TBLOCK_STARTED;
4417 : 17428 : }
4418 : :
4419 : : /*
4420 : : * DefineSavepoint
4421 : : * This executes a SAVEPOINT command.
4422 : : */
4423 : : void
3108 peter_e@gmx.net 4424 : 1653 : DefineSavepoint(const char *name)
4425 : : {
7919 bruce@momjian.us 4426 : 1653 : TransactionState s = CurrentTransactionState;
4427 : :
4428 : : /*
4429 : : * Workers synchronize transaction state at the beginning of each parallel
4430 : : * operation, so we can't account for new subtransactions after that
4431 : : * point. (Note that this check will certainly error out if s->blockState
4432 : : * is TBLOCK_PARALLEL_INPROGRESS, so we can treat that as an invalid case
4433 : : * below.)
4434 : : */
768 tgl@sss.pgh.pa.us 4435 [ + - - + ]: 1653 : if (IsInParallelMode() || IsParallelWorker())
4023 rhaas@postgresql.org 4436 [ # # ]:UBC 0 : ereport(ERROR,
4437 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
4438 : : errmsg("cannot define savepoints during a parallel operation")));
4439 : :
7952 tgl@sss.pgh.pa.us 4440 [ + + - - ]:CBC 1653 : switch (s->blockState)
4441 : : {
4442 : 1645 : case TBLOCK_INPROGRESS:
4443 : : case TBLOCK_SUBINPROGRESS:
4444 : : /* Normal subtransaction start */
4445 : 1645 : PushTransaction();
3240 4446 : 1645 : s = CurrentTransactionState; /* changed by push */
4447 : :
4448 : : /*
4449 : : * Savepoint names, like the TransactionState block itself, live
4450 : : * in TopTransactionContext.
4451 : : */
7901 4452 [ + + ]: 1645 : if (name)
4453 : 1167 : s->name = MemoryContextStrdup(TopTransactionContext, name);
7952 4454 : 1645 : break;
4455 : :
4456 : : /*
4457 : : * We disallow savepoint commands in implicit transaction blocks.
4458 : : * There would be no great difficulty in allowing them so far as
4459 : : * this module is concerned, but a savepoint seems inconsistent
4460 : : * with exec_simple_query's behavior of abandoning the whole query
4461 : : * string upon error. Also, the point of an implicit transaction
4462 : : * block (as opposed to a regular one) is to automatically close
4463 : : * after an error, so it's hard to see how a savepoint would fit
4464 : : * into that.
4465 : : *
4466 : : * The error messages for this are phrased as if there were no
4467 : : * active transaction block at all, which is historical but
4468 : : * perhaps could be improved.
4469 : : */
3162 4470 : 8 : case TBLOCK_IMPLICIT_INPROGRESS:
4471 [ + - ]: 8 : ereport(ERROR,
4472 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4473 : : /* translator: %s represents an SQL statement name */
4474 : : errmsg("%s can only be used in transaction blocks",
4475 : : "SAVEPOINT")));
4476 : : break;
4477 : :
4478 : : /* These cases are invalid. */
7952 tgl@sss.pgh.pa.us 4479 :UBC 0 : case TBLOCK_DEFAULT:
4480 : : case TBLOCK_STARTED:
4481 : : case TBLOCK_BEGIN:
4482 : : case TBLOCK_PARALLEL_INPROGRESS:
4483 : : case TBLOCK_SUBBEGIN:
4484 : : case TBLOCK_END:
4485 : : case TBLOCK_SUBRELEASE:
4486 : : case TBLOCK_SUBCOMMIT:
4487 : : case TBLOCK_ABORT:
4488 : : case TBLOCK_SUBABORT:
4489 : : case TBLOCK_ABORT_END:
4490 : : case TBLOCK_SUBABORT_END:
4491 : : case TBLOCK_ABORT_PENDING:
4492 : : case TBLOCK_SUBABORT_PENDING:
4493 : : case TBLOCK_SUBRESTART:
4494 : : case TBLOCK_SUBABORT_RESTART:
4495 : : case TBLOCK_PREPARE:
7948 4496 [ # # ]: 0 : elog(FATAL, "DefineSavepoint: unexpected state %s",
4497 : : BlockStateAsString(s->blockState));
4498 : : break;
4499 : : }
7952 tgl@sss.pgh.pa.us 4500 :CBC 1645 : }
4501 : :
4502 : : /*
4503 : : * ReleaseSavepoint
4504 : : * This executes a RELEASE command.
4505 : : *
4506 : : * As above, we don't actually do anything here except change blockState.
4507 : : */
4508 : : void
3000 peter_e@gmx.net 4509 : 181 : ReleaseSavepoint(const char *name)
4510 : : {
7919 bruce@momjian.us 4511 : 181 : TransactionState s = CurrentTransactionState;
4512 : : TransactionState target,
4513 : : xact;
4514 : :
4515 : : /*
4516 : : * Workers synchronize transaction state at the beginning of each parallel
4517 : : * operation, so we can't account for transaction state change after that
4518 : : * point. (Note that this check will certainly error out if s->blockState
4519 : : * is TBLOCK_PARALLEL_INPROGRESS, so we can treat that as an invalid case
4520 : : * below.)
4521 : : */
768 tgl@sss.pgh.pa.us 4522 [ + - - + ]: 181 : if (IsInParallelMode() || IsParallelWorker())
4023 rhaas@postgresql.org 4523 [ # # ]:UBC 0 : ereport(ERROR,
4524 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
4525 : : errmsg("cannot release savepoints during a parallel operation")));
4526 : :
7952 tgl@sss.pgh.pa.us 4527 [ - + + - :CBC 181 : switch (s->blockState)
- ]
4528 : : {
4529 : : /*
4530 : : * We can't release a savepoint if there is no savepoint defined.
4531 : : */
7952 tgl@sss.pgh.pa.us 4532 :UBC 0 : case TBLOCK_INPROGRESS:
4533 [ # # ]: 0 : ereport(ERROR,
4534 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4535 : : errmsg("savepoint \"%s\" does not exist", name)));
4536 : : break;
4537 : :
3162 tgl@sss.pgh.pa.us 4538 :CBC 4 : case TBLOCK_IMPLICIT_INPROGRESS:
4539 : : /* See comment about implicit transactions in DefineSavepoint */
4540 [ + - ]: 4 : ereport(ERROR,
4541 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4542 : : /* translator: %s represents an SQL statement name */
4543 : : errmsg("%s can only be used in transaction blocks",
4544 : : "RELEASE SAVEPOINT")));
4545 : : break;
4546 : :
4547 : : /*
4548 : : * We are in a non-aborted subtransaction. This is the only valid
4549 : : * case.
4550 : : */
7952 4551 : 177 : case TBLOCK_SUBINPROGRESS:
4552 : 177 : break;
4553 : :
4554 : : /* These cases are invalid. */
7952 tgl@sss.pgh.pa.us 4555 :UBC 0 : case TBLOCK_DEFAULT:
4556 : : case TBLOCK_STARTED:
4557 : : case TBLOCK_BEGIN:
4558 : : case TBLOCK_PARALLEL_INPROGRESS:
4559 : : case TBLOCK_SUBBEGIN:
4560 : : case TBLOCK_END:
4561 : : case TBLOCK_SUBRELEASE:
4562 : : case TBLOCK_SUBCOMMIT:
4563 : : case TBLOCK_ABORT:
4564 : : case TBLOCK_SUBABORT:
4565 : : case TBLOCK_ABORT_END:
4566 : : case TBLOCK_SUBABORT_END:
4567 : : case TBLOCK_ABORT_PENDING:
4568 : : case TBLOCK_SUBABORT_PENDING:
4569 : : case TBLOCK_SUBRESTART:
4570 : : case TBLOCK_SUBABORT_RESTART:
4571 : : case TBLOCK_PREPARE:
4572 [ # # ]: 0 : elog(FATAL, "ReleaseSavepoint: unexpected state %s",
4573 : : BlockStateAsString(s->blockState));
4574 : : break;
4575 : : }
4576 : :
223 peter@eisentraut.org 4577 [ + - ]:GNC 264 : for (target = s; target; target = target->parent)
4578 : : {
4579 [ + - + + ]: 264 : if (target->name && strcmp(target->name, name) == 0)
7952 tgl@sss.pgh.pa.us 4580 :CBC 177 : break;
4581 : : }
4582 : :
223 peter@eisentraut.org 4583 [ - + ]:GNC 177 : if (!target)
7952 tgl@sss.pgh.pa.us 4584 [ # # ]:UBC 0 : ereport(ERROR,
4585 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4586 : : errmsg("savepoint \"%s\" does not exist", name)));
4587 : :
4588 : : /* disallow crossing savepoint level boundaries */
7923 tgl@sss.pgh.pa.us 4589 [ - + ]:CBC 177 : if (target->savepointLevel != s->savepointLevel)
7923 tgl@sss.pgh.pa.us 4590 [ # # ]:UBC 0 : ereport(ERROR,
4591 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4592 : : errmsg("savepoint \"%s\" does not exist within current savepoint level", name)));
4593 : :
4594 : : /*
4595 : : * Mark "commit pending" all subtransactions up to the target
4596 : : * subtransaction. The actual commits will happen when control gets to
4597 : : * CommitTransactionCommand.
4598 : : */
7923 tgl@sss.pgh.pa.us 4599 :CBC 177 : xact = CurrentTransactionState;
4600 : : for (;;)
4601 : : {
4602 [ - + ]: 264 : Assert(xact->blockState == TBLOCK_SUBINPROGRESS);
5404 simon@2ndQuadrant.co 4603 : 264 : xact->blockState = TBLOCK_SUBRELEASE;
7923 tgl@sss.pgh.pa.us 4604 [ + + ]: 264 : if (xact == target)
4605 : 177 : break;
4606 : 87 : xact = xact->parent;
223 peter@eisentraut.org 4607 [ - + ]:GNC 87 : Assert(xact);
4608 : : }
7952 tgl@sss.pgh.pa.us 4609 :CBC 177 : }
4610 : :
4611 : : /*
4612 : : * RollbackToSavepoint
4613 : : * This executes a ROLLBACK TO <savepoint> command.
4614 : : *
4615 : : * As above, we don't actually do anything here except change blockState.
4616 : : */
4617 : : void
3000 peter_e@gmx.net 4618 : 486 : RollbackToSavepoint(const char *name)
4619 : : {
7952 tgl@sss.pgh.pa.us 4620 : 486 : TransactionState s = CurrentTransactionState;
4621 : : TransactionState target,
4622 : : xact;
4623 : :
4624 : : /*
4625 : : * Workers synchronize transaction state at the beginning of each parallel
4626 : : * operation, so we can't account for transaction state change after that
4627 : : * point. (Note that this check will certainly error out if s->blockState
4628 : : * is TBLOCK_PARALLEL_INPROGRESS, so we can treat that as an invalid case
4629 : : * below.)
4630 : : */
768 4631 [ + - - + ]: 486 : if (IsInParallelMode() || IsParallelWorker())
4023 rhaas@postgresql.org 4632 [ # # ]:UBC 0 : ereport(ERROR,
4633 : : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
4634 : : errmsg("cannot rollback to savepoints during a parallel operation")));
4635 : :
7952 tgl@sss.pgh.pa.us 4636 [ + + + - :CBC 486 : switch (s->blockState)
- ]
4637 : : {
4638 : : /*
4639 : : * We can't rollback to a savepoint if there is no savepoint
4640 : : * defined.
4641 : : */
4642 : 4 : case TBLOCK_INPROGRESS:
4643 : : case TBLOCK_ABORT:
4644 [ + - ]: 4 : ereport(ERROR,
4645 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4646 : : errmsg("savepoint \"%s\" does not exist", name)));
4647 : : break;
4648 : :
3162 4649 : 4 : case TBLOCK_IMPLICIT_INPROGRESS:
4650 : : /* See comment about implicit transactions in DefineSavepoint */
4651 [ + - ]: 4 : ereport(ERROR,
4652 : : (errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
4653 : : /* translator: %s represents an SQL statement name */
4654 : : errmsg("%s can only be used in transaction blocks",
4655 : : "ROLLBACK TO SAVEPOINT")));
4656 : : break;
4657 : :
4658 : : /*
4659 : : * There is at least one savepoint, so proceed.
4660 : : */
7952 4661 : 478 : case TBLOCK_SUBINPROGRESS:
4662 : : case TBLOCK_SUBABORT:
4663 : 478 : break;
4664 : :
4665 : : /* These cases are invalid. */
7952 tgl@sss.pgh.pa.us 4666 :UBC 0 : case TBLOCK_DEFAULT:
4667 : : case TBLOCK_STARTED:
4668 : : case TBLOCK_BEGIN:
4669 : : case TBLOCK_PARALLEL_INPROGRESS:
4670 : : case TBLOCK_SUBBEGIN:
4671 : : case TBLOCK_END:
4672 : : case TBLOCK_SUBRELEASE:
4673 : : case TBLOCK_SUBCOMMIT:
4674 : : case TBLOCK_ABORT_END:
4675 : : case TBLOCK_SUBABORT_END:
4676 : : case TBLOCK_ABORT_PENDING:
4677 : : case TBLOCK_SUBABORT_PENDING:
4678 : : case TBLOCK_SUBRESTART:
4679 : : case TBLOCK_SUBABORT_RESTART:
4680 : : case TBLOCK_PREPARE:
4681 [ # # ]: 0 : elog(FATAL, "RollbackToSavepoint: unexpected state %s",
4682 : : BlockStateAsString(s->blockState));
4683 : : break;
4684 : : }
4685 : :
223 peter@eisentraut.org 4686 [ + - ]:GNC 516 : for (target = s; target; target = target->parent)
4687 : : {
4688 [ + - + + ]: 516 : if (target->name && strcmp(target->name, name) == 0)
7952 tgl@sss.pgh.pa.us 4689 :CBC 478 : break;
4690 : : }
4691 : :
223 peter@eisentraut.org 4692 [ - + ]:GNC 478 : if (!target)
7952 tgl@sss.pgh.pa.us 4693 [ # # ]:UBC 0 : ereport(ERROR,
4694 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4695 : : errmsg("savepoint \"%s\" does not exist", name)));
4696 : :
4697 : : /* disallow crossing savepoint level boundaries */
7945 tgl@sss.pgh.pa.us 4698 [ - + ]:CBC 478 : if (target->savepointLevel != s->savepointLevel)
7945 tgl@sss.pgh.pa.us 4699 [ # # ]:UBC 0 : ereport(ERROR,
4700 : : (errcode(ERRCODE_S_E_INVALID_SPECIFICATION),
4701 : : errmsg("savepoint \"%s\" does not exist within current savepoint level", name)));
4702 : :
4703 : : /*
4704 : : * Mark "abort pending" all subtransactions up to the target
4705 : : * subtransaction. The actual aborts will happen when control gets to
4706 : : * CommitTransactionCommand.
4707 : : */
7952 tgl@sss.pgh.pa.us 4708 :CBC 478 : xact = CurrentTransactionState;
4709 : : for (;;)
4710 : : {
7901 4711 [ + + ]: 516 : if (xact == target)
4712 : 478 : break;
4713 [ + - ]: 38 : if (xact->blockState == TBLOCK_SUBINPROGRESS)
4714 : 38 : xact->blockState = TBLOCK_SUBABORT_PENDING;
7901 tgl@sss.pgh.pa.us 4715 [ # # ]:UBC 0 : else if (xact->blockState == TBLOCK_SUBABORT)
4716 : 0 : xact->blockState = TBLOCK_SUBABORT_END;
4717 : : else
4718 [ # # ]: 0 : elog(FATAL, "RollbackToSavepoint: unexpected state %s",
4719 : : BlockStateAsString(xact->blockState));
7952 tgl@sss.pgh.pa.us 4720 :CBC 38 : xact = xact->parent;
223 peter@eisentraut.org 4721 [ - + ]:GNC 38 : Assert(xact);
4722 : : }
4723 : :
4724 : : /* And mark the target as "restart pending" */
7901 tgl@sss.pgh.pa.us 4725 [ + + ]:CBC 478 : if (xact->blockState == TBLOCK_SUBINPROGRESS)
4726 : 335 : xact->blockState = TBLOCK_SUBRESTART;
4727 [ + - ]: 143 : else if (xact->blockState == TBLOCK_SUBABORT)
4728 : 143 : xact->blockState = TBLOCK_SUBABORT_RESTART;
4729 : : else
7901 tgl@sss.pgh.pa.us 4730 [ # # ]:UBC 0 : elog(FATAL, "RollbackToSavepoint: unexpected state %s",
4731 : : BlockStateAsString(xact->blockState));
7952 tgl@sss.pgh.pa.us 4732 :CBC 478 : }
4733 : :
4734 : : /*
4735 : : * BeginInternalSubTransaction
4736 : : * This is the same as DefineSavepoint except it allows TBLOCK_STARTED,
4737 : : * TBLOCK_IMPLICIT_INPROGRESS, TBLOCK_PARALLEL_INPROGRESS, TBLOCK_END,
4738 : : * and TBLOCK_PREPARE states, and therefore it can safely be used in
4739 : : * functions that might be called when not inside a BEGIN block or when
4740 : : * running deferred triggers at COMMIT/PREPARE time. Also, it
4741 : : * automatically does CommitTransactionCommand/StartTransactionCommand
4742 : : * instead of expecting the caller to do it.
4743 : : */
4744 : : void
3108 peter_e@gmx.net 4745 : 11001 : BeginInternalSubTransaction(const char *name)
4746 : : {
7919 bruce@momjian.us 4747 : 11001 : TransactionState s = CurrentTransactionState;
768 tgl@sss.pgh.pa.us 4748 : 11001 : bool save_ExitOnAnyError = ExitOnAnyError;
4749 : :
4750 : : /*
4751 : : * Errors within this function are improbable, but if one does happen we
4752 : : * force a FATAL exit. Callers generally aren't prepared to handle losing
4753 : : * control, and moreover our transaction state is probably corrupted if we
4754 : : * fail partway through; so an ordinary ERROR longjmp isn't okay.
4755 : : */
4756 : 11001 : ExitOnAnyError = true;
4757 : :
4758 : : /*
4759 : : * We do not check for parallel mode here. It's permissible to start and
4760 : : * end "internal" subtransactions while in parallel mode, so long as no
4761 : : * new XIDs or command IDs are assigned. Enforcement of that occurs in
4762 : : * AssignTransactionId() and CommandCounterIncrement().
4763 : : */
4764 : :
7948 4765 [ + - - ]: 11001 : switch (s->blockState)
4766 : : {
4767 : 11001 : case TBLOCK_STARTED:
4768 : : case TBLOCK_INPROGRESS:
4769 : : case TBLOCK_IMPLICIT_INPROGRESS:
4770 : : case TBLOCK_PARALLEL_INPROGRESS:
4771 : : case TBLOCK_END:
4772 : : case TBLOCK_PREPARE:
4773 : : case TBLOCK_SUBINPROGRESS:
4774 : : /* Normal subtransaction start */
4775 : 11001 : PushTransaction();
3240 4776 : 11001 : s = CurrentTransactionState; /* changed by push */
4777 : :
4778 : : /*
4779 : : * Savepoint names, like the TransactionState block itself, live
4780 : : * in TopTransactionContext.
4781 : : */
7948 4782 [ + + ]: 11001 : if (name)
7901 4783 : 982 : s->name = MemoryContextStrdup(TopTransactionContext, name);
7948 4784 : 11001 : break;
4785 : :
4786 : : /* These cases are invalid. */
7948 tgl@sss.pgh.pa.us 4787 :UBC 0 : case TBLOCK_DEFAULT:
4788 : : case TBLOCK_BEGIN:
4789 : : case TBLOCK_SUBBEGIN:
4790 : : case TBLOCK_SUBRELEASE:
4791 : : case TBLOCK_SUBCOMMIT:
4792 : : case TBLOCK_ABORT:
4793 : : case TBLOCK_SUBABORT:
4794 : : case TBLOCK_ABORT_END:
4795 : : case TBLOCK_SUBABORT_END:
4796 : : case TBLOCK_ABORT_PENDING:
4797 : : case TBLOCK_SUBABORT_PENDING:
4798 : : case TBLOCK_SUBRESTART:
4799 : : case TBLOCK_SUBABORT_RESTART:
4800 [ # # ]: 0 : elog(FATAL, "BeginInternalSubTransaction: unexpected state %s",
4801 : : BlockStateAsString(s->blockState));
4802 : : break;
4803 : : }
4804 : :
7948 tgl@sss.pgh.pa.us 4805 :CBC 11001 : CommitTransactionCommand();
4806 : 11001 : StartTransactionCommand();
4807 : :
768 4808 : 11001 : ExitOnAnyError = save_ExitOnAnyError;
7948 4809 : 11001 : }
4810 : :
4811 : : /*
4812 : : * ReleaseCurrentSubTransaction
4813 : : *
4814 : : * RELEASE (ie, commit) the innermost subtransaction, regardless of its
4815 : : * savepoint name (if any).
4816 : : * NB: do NOT use CommitTransactionCommand/StartTransactionCommand with this.
4817 : : */
4818 : : void
4819 : 6391 : ReleaseCurrentSubTransaction(void)
4820 : : {
4821 : 6391 : TransactionState s = CurrentTransactionState;
4822 : :
4823 : : /*
4824 : : * We do not check for parallel mode here. It's permissible to start and
4825 : : * end "internal" subtransactions while in parallel mode, so long as no
4826 : : * new XIDs or command IDs are assigned.
4827 : : */
4828 : :
4829 [ - + ]: 6391 : if (s->blockState != TBLOCK_SUBINPROGRESS)
7948 tgl@sss.pgh.pa.us 4830 [ # # ]:UBC 0 : elog(ERROR, "ReleaseCurrentSubTransaction: unexpected state %s",
4831 : : BlockStateAsString(s->blockState));
7907 tgl@sss.pgh.pa.us 4832 [ - + ]:CBC 6391 : Assert(s->state == TRANS_INPROGRESS);
7948 4833 : 6391 : MemoryContextSwitchTo(CurTransactionContext);
5354 simon@2ndQuadrant.co 4834 : 6391 : CommitSubTransaction();
7507 bruce@momjian.us 4835 : 6391 : s = CurrentTransactionState; /* changed by pop */
7907 tgl@sss.pgh.pa.us 4836 [ - + ]: 6391 : Assert(s->state == TRANS_INPROGRESS);
7948 4837 : 6391 : }
4838 : :
4839 : : /*
4840 : : * RollbackAndReleaseCurrentSubTransaction
4841 : : *
4842 : : * ROLLBACK and RELEASE (ie, abort) the innermost subtransaction, regardless
4843 : : * of its savepoint name (if any).
4844 : : * NB: do NOT use CommitTransactionCommand/StartTransactionCommand with this.
4845 : : */
4846 : : void
4847 : 4610 : RollbackAndReleaseCurrentSubTransaction(void)
4848 : : {
4849 : 4610 : TransactionState s = CurrentTransactionState;
4850 : :
4851 : : /*
4852 : : * We do not check for parallel mode here. It's permissible to start and
4853 : : * end "internal" subtransactions while in parallel mode, so long as no
4854 : : * new XIDs or command IDs are assigned.
4855 : : */
4856 : :
4857 [ + - - ]: 4610 : switch (s->blockState)
4858 : : {
4859 : : /* Must be in a subtransaction */
4860 : 4610 : case TBLOCK_SUBINPROGRESS:
4861 : : case TBLOCK_SUBABORT:
4862 : 4610 : break;
4863 : :
4864 : : /* These cases are invalid. */
7948 tgl@sss.pgh.pa.us 4865 :UBC 0 : case TBLOCK_DEFAULT:
4866 : : case TBLOCK_STARTED:
4867 : : case TBLOCK_BEGIN:
4868 : : case TBLOCK_IMPLICIT_INPROGRESS:
4869 : : case TBLOCK_PARALLEL_INPROGRESS:
4870 : : case TBLOCK_SUBBEGIN:
4871 : : case TBLOCK_INPROGRESS:
4872 : : case TBLOCK_END:
4873 : : case TBLOCK_SUBRELEASE:
4874 : : case TBLOCK_SUBCOMMIT:
4875 : : case TBLOCK_ABORT:
4876 : : case TBLOCK_ABORT_END:
4877 : : case TBLOCK_SUBABORT_END:
4878 : : case TBLOCK_ABORT_PENDING:
4879 : : case TBLOCK_SUBABORT_PENDING:
4880 : : case TBLOCK_SUBRESTART:
4881 : : case TBLOCK_SUBABORT_RESTART:
4882 : : case TBLOCK_PREPARE:
4883 [ # # ]: 0 : elog(FATAL, "RollbackAndReleaseCurrentSubTransaction: unexpected state %s",
4884 : : BlockStateAsString(s->blockState));
4885 : : break;
4886 : : }
4887 : :
4888 : : /*
4889 : : * Abort the current subtransaction, if needed.
4890 : : */
7948 tgl@sss.pgh.pa.us 4891 [ + + ]:CBC 4610 : if (s->blockState == TBLOCK_SUBINPROGRESS)
4892 : 3628 : AbortSubTransaction();
4893 : :
4894 : : /* And clean it up, too */
7901 4895 : 4610 : CleanupSubTransaction();
4896 : :
4897 : 4610 : s = CurrentTransactionState; /* changed by pop */
1285 peter@eisentraut.org 4898 [ + + + + : 4610 : Assert(s->blockState == TBLOCK_SUBINPROGRESS ||
+ - + + -
+ ]
4899 : : s->blockState == TBLOCK_INPROGRESS ||
4900 : : s->blockState == TBLOCK_IMPLICIT_INPROGRESS ||
4901 : : s->blockState == TBLOCK_PARALLEL_INPROGRESS ||
4902 : : s->blockState == TBLOCK_STARTED);
10892 scrappy@hub.org 4903 : 4610 : }
4904 : :
4905 : : /*
4906 : : * AbortOutOfAnyTransaction
4907 : : *
4908 : : * This routine is provided for error recovery purposes. It aborts any
4909 : : * active transaction or transaction block, leaving the system in a known
4910 : : * idle state.
4911 : : */
4912 : : void
9324 tgl@sss.pgh.pa.us 4913 : 18991 : AbortOutOfAnyTransaction(void)
4914 : : {
10073 4915 : 18991 : TransactionState s = CurrentTransactionState;
4916 : :
4917 : : /* Ensure we're not running in a doomed memory context */
3186 4918 : 18991 : AtAbort_Memory();
4919 : :
4920 : : /*
4921 : : * Get out of any transaction or nested transaction
4922 : : */
4923 : : do
4924 : : {
7978 4925 [ + + + - : 18991 : switch (s->blockState)
- - ]
4926 : : {
4927 : 18167 : case TBLOCK_DEFAULT:
5090 4928 [ - + ]: 18167 : if (s->state == TRANS_DEFAULT)
4929 : : {
4930 : : /* Not in a transaction, do nothing */
4931 : : }
4932 : : else
4933 : : {
4934 : : /*
4935 : : * We can get here after an error during transaction start
4936 : : * (state will be TRANS_START). Need to clean up the
4937 : : * incompletely started transaction. First, adjust the
4938 : : * low-level state to suppress warning message from
4939 : : * AbortTransaction.
4940 : : */
5090 tgl@sss.pgh.pa.us 4941 [ # # ]:UBC 0 : if (s->state == TRANS_START)
4942 : 0 : s->state = TRANS_INPROGRESS;
4943 : 0 : AbortTransaction();
4944 : 0 : CleanupTransaction();
4945 : : }
7978 tgl@sss.pgh.pa.us 4946 :CBC 18167 : break;
4947 : 810 : case TBLOCK_STARTED:
4948 : : case TBLOCK_BEGIN:
4949 : : case TBLOCK_INPROGRESS:
4950 : : case TBLOCK_IMPLICIT_INPROGRESS:
4951 : : case TBLOCK_PARALLEL_INPROGRESS:
4952 : : case TBLOCK_END:
4953 : : case TBLOCK_ABORT_PENDING:
4954 : : case TBLOCK_PREPARE:
4955 : : /* In a transaction, so clean up */
4956 : 810 : AbortTransaction();
4957 : 810 : CleanupTransaction();
4958 : 810 : s->blockState = TBLOCK_DEFAULT;
4959 : 810 : break;
4960 : 14 : case TBLOCK_ABORT:
4961 : : case TBLOCK_ABORT_END:
4962 : :
4963 : : /*
4964 : : * AbortTransaction is already done, still need Cleanup.
4965 : : * However, if we failed partway through running ROLLBACK,
4966 : : * there will be an active portal running that command, which
4967 : : * we need to shut down before doing CleanupTransaction.
4968 : : */
3186 4969 : 14 : AtAbort_Portals();
7978 4970 : 14 : CleanupTransaction();
4971 : 14 : s->blockState = TBLOCK_DEFAULT;
4972 : 14 : break;
4973 : :
4974 : : /*
4975 : : * In a subtransaction, so clean it up and abort parent too
4976 : : */
7901 tgl@sss.pgh.pa.us 4977 :UBC 0 : case TBLOCK_SUBBEGIN:
4978 : : case TBLOCK_SUBINPROGRESS:
4979 : : case TBLOCK_SUBRELEASE:
4980 : : case TBLOCK_SUBCOMMIT:
4981 : : case TBLOCK_SUBABORT_PENDING:
4982 : : case TBLOCK_SUBRESTART:
7978 4983 : 0 : AbortSubTransaction();
4984 : 0 : CleanupSubTransaction();
7919 bruce@momjian.us 4985 : 0 : s = CurrentTransactionState; /* changed by pop */
7978 tgl@sss.pgh.pa.us 4986 : 0 : break;
4987 : :
4988 : 0 : case TBLOCK_SUBABORT:
4989 : : case TBLOCK_SUBABORT_END:
4990 : : case TBLOCK_SUBABORT_RESTART:
4991 : : /* As above, but AbortSubTransaction already done */
3186 4992 [ # # ]: 0 : if (s->curTransactionOwner)
4993 : : {
4994 : : /* As in TBLOCK_ABORT, might have a live portal to zap */
4995 : 0 : AtSubAbort_Portals(s->subTransactionId,
4996 : 0 : s->parent->subTransactionId,
4997 : : s->curTransactionOwner,
4998 : 0 : s->parent->curTransactionOwner);
4999 : : }
7978 5000 : 0 : CleanupSubTransaction();
7919 bruce@momjian.us 5001 : 0 : s = CurrentTransactionState; /* changed by pop */
7978 tgl@sss.pgh.pa.us 5002 : 0 : break;
5003 : : }
7978 tgl@sss.pgh.pa.us 5004 [ - + ]:CBC 18991 : } while (s->blockState != TBLOCK_DEFAULT);
5005 : :
5006 : : /* Should be out of all subxacts now */
5007 [ - + ]: 18991 : Assert(s->parent == NULL);
5008 : :
5009 : : /*
5010 : : * Revert to TopMemoryContext, to ensure we exit in a well-defined state
5011 : : * whether there were any transactions to close or not. (Callers that
5012 : : * don't intend to exit soon should switch to some other context to avoid
5013 : : * long-term memory leaks.)
5014 : : */
673 5015 : 18991 : MemoryContextSwitchTo(TopMemoryContext);
10073 5016 : 18991 : }
5017 : :
5018 : : /*
5019 : : * IsTransactionBlock --- are we within a transaction block?
5020 : : */
5021 : : bool
9324 5022 : 243121 : IsTransactionBlock(void)
5023 : : {
10467 bruce@momjian.us 5024 : 243121 : TransactionState s = CurrentTransactionState;
5025 : :
8065 5026 [ + + + + ]: 243121 : if (s->blockState == TBLOCK_DEFAULT || s->blockState == TBLOCK_STARTED)
8410 tgl@sss.pgh.pa.us 5027 : 175028 : return false;
5028 : :
5029 : 68093 : return true;
5030 : : }
5031 : :
5032 : : /*
5033 : : * IsTransactionOrTransactionBlock --- are we within either a transaction
5034 : : * or a transaction block? (The backend is only really "idle" when this
5035 : : * returns false.)
5036 : : *
5037 : : * This should match up with IsTransactionBlock and IsTransactionState.
5038 : : */
5039 : : bool
8237 5040 : 849167 : IsTransactionOrTransactionBlock(void)
5041 : : {
5042 : 849167 : TransactionState s = CurrentTransactionState;
5043 : :
8065 bruce@momjian.us 5044 [ + + ]: 849167 : if (s->blockState == TBLOCK_DEFAULT)
8237 tgl@sss.pgh.pa.us 5045 : 752677 : return false;
5046 : :
5047 : 96490 : return true;
5048 : : }
5049 : :
5050 : : /*
5051 : : * TransactionBlockStatusCode - return status code to send in ReadyForQuery
5052 : : */
5053 : : char
8410 5054 : 419608 : TransactionBlockStatusCode(void)
5055 : : {
5056 : 419608 : TransactionState s = CurrentTransactionState;
5057 : :
5058 [ + + + - ]: 419608 : switch (s->blockState)
5059 : : {
5060 : 323795 : case TBLOCK_DEFAULT:
5061 : : case TBLOCK_STARTED:
5062 : 323795 : return 'I'; /* idle --- not in transaction */
5063 : 94614 : case TBLOCK_BEGIN:
5064 : : case TBLOCK_SUBBEGIN:
5065 : : case TBLOCK_INPROGRESS:
5066 : : case TBLOCK_IMPLICIT_INPROGRESS:
5067 : : case TBLOCK_PARALLEL_INPROGRESS:
5068 : : case TBLOCK_SUBINPROGRESS:
5069 : : case TBLOCK_END:
5070 : : case TBLOCK_SUBRELEASE:
5071 : : case TBLOCK_SUBCOMMIT:
5072 : : case TBLOCK_PREPARE:
5073 : 94614 : return 'T'; /* in transaction */
5074 : 1199 : case TBLOCK_ABORT:
5075 : : case TBLOCK_SUBABORT:
5076 : : case TBLOCK_ABORT_END:
5077 : : case TBLOCK_SUBABORT_END:
5078 : : case TBLOCK_ABORT_PENDING:
5079 : : case TBLOCK_SUBABORT_PENDING:
5080 : : case TBLOCK_SUBRESTART:
5081 : : case TBLOCK_SUBABORT_RESTART:
5082 : 1199 : return 'E'; /* in failed transaction */
5083 : : }
5084 : :
5085 : : /* should never get here */
7978 tgl@sss.pgh.pa.us 5086 [ # # ]:UBC 0 : elog(FATAL, "invalid transaction block state: %s",
5087 : : BlockStateAsString(s->blockState));
5088 : : return 0; /* keep compiler quiet */
5089 : : }
5090 : :
5091 : : /*
5092 : : * IsSubTransaction
5093 : : */
5094 : : bool
7978 tgl@sss.pgh.pa.us 5095 :CBC 632526 : IsSubTransaction(void)
5096 : : {
5097 : 632526 : TransactionState s = CurrentTransactionState;
5098 : :
7947 5099 [ + + ]: 632526 : if (s->nestingLevel >= 2)
5100 : 473 : return true;
5101 : :
5102 : 632053 : return false;
5103 : : }
5104 : :
5105 : : /*
5106 : : * StartSubTransaction
5107 : : *
5108 : : * If you're wondering why this is separate from PushTransaction: it's because
5109 : : * we can't conveniently do this stuff right inside DefineSavepoint. The
5110 : : * SAVEPOINT utility command will be executed inside a Portal, and if we
5111 : : * muck with CurrentMemoryContext or CurrentResourceOwner then exit from
5112 : : * the Portal will undo those settings. So we make DefineSavepoint just
5113 : : * push a dummy transaction block, and when control returns to the main
5114 : : * idle loop, CommitTransactionCommand will be called, and we'll come here
5115 : : * to finish starting the subtransaction.
5116 : : */
5117 : : static void
7978 5118 : 12646 : StartSubTransaction(void)
5119 : : {
5120 : 12646 : TransactionState s = CurrentTransactionState;
5121 : :
5122 [ - + ]: 12646 : if (s->state != TRANS_DEFAULT)
7951 tgl@sss.pgh.pa.us 5123 [ # # ]:UBC 0 : elog(WARNING, "StartSubTransaction while in %s state",
5124 : : TransStateAsString(s->state));
5125 : :
7978 tgl@sss.pgh.pa.us 5126 :CBC 12646 : s->state = TRANS_START;
5127 : :
5128 : : /*
5129 : : * Initialize subsystems for new subtransaction
5130 : : *
5131 : : * must initialize resource-management stuff first
5132 : : */
7962 5133 : 12646 : AtSubStart_Memory();
5134 : 12646 : AtSubStart_ResourceOwner();
7907 5135 : 12646 : AfterTriggerBeginSubXact();
5136 : :
7978 5137 : 12646 : s->state = TRANS_INPROGRESS;
5138 : :
5139 : : /*
5140 : : * Call start-of-subxact callbacks
5141 : : */
7901 5142 : 12646 : CallSubXactCallbacks(SUBXACT_EVENT_START_SUB, s->subTransactionId,
5143 : 12646 : s->parent->subTransactionId);
5144 : :
7978 5145 : 12646 : ShowTransactionState("StartSubTransaction");
5146 : 12646 : }
5147 : :
5148 : : /*
5149 : : * CommitSubTransaction
5150 : : *
5151 : : * The caller has to make sure to always reassign CurrentTransactionState
5152 : : * if it has a local pointer to it after calling this function.
5153 : : */
5154 : : static void
5354 simon@2ndQuadrant.co 5155 : 7266 : CommitSubTransaction(void)
5156 : : {
7978 tgl@sss.pgh.pa.us 5157 : 7266 : TransactionState s = CurrentTransactionState;
5158 : :
5159 : 7266 : ShowTransactionState("CommitSubTransaction");
5160 : :
5161 [ - + ]: 7266 : if (s->state != TRANS_INPROGRESS)
7951 tgl@sss.pgh.pa.us 5162 [ # # ]:UBC 0 : elog(WARNING, "CommitSubTransaction while in %s state",
5163 : : TransStateAsString(s->state));
5164 : :
5165 : : /* Pre-commit processing goes here */
5166 : :
4828 tgl@sss.pgh.pa.us 5167 :CBC 7266 : CallSubXactCallbacks(SUBXACT_EVENT_PRE_COMMIT_SUB, s->subTransactionId,
5168 : 7266 : s->parent->subTransactionId);
5169 : :
5170 : : /*
5171 : : * If this subxact has started any unfinished parallel operation, clean up
5172 : : * its workers and exit parallel mode. Warn about leaked resources.
5173 : : */
768 5174 : 7266 : AtEOSubXact_Parallel(true, s->subTransactionId);
5175 [ - + ]: 7266 : if (s->parallelModeLevel != 0)
5176 : : {
768 tgl@sss.pgh.pa.us 5177 [ # # ]:UBC 0 : elog(WARNING, "parallelModeLevel is %d not 0 at end of subtransaction",
5178 : : s->parallelModeLevel);
4023 rhaas@postgresql.org 5179 : 0 : s->parallelModeLevel = 0;
5180 : : }
5181 : :
5182 : : /* Do the actual "commit", such as it is */
7978 tgl@sss.pgh.pa.us 5183 :CBC 7266 : s->state = TRANS_COMMIT;
5184 : :
5185 : : /* Must CCI to ensure commands of subtransaction are seen as done */
5186 : 7266 : CommandCounterIncrement();
5187 : :
5188 : : /*
5189 : : * Prior to 8.4 we marked subcommit in clog at this point. We now only
5190 : : * perform that step, if required, as part of the atomic update of the
5191 : : * whole transaction tree at top level commit or abort.
5192 : : */
5193 : :
5194 : : /* Post-commit cleanup */
2595 tmunro@postgresql.or 5195 [ + + ]: 7266 : if (FullTransactionIdIsValid(s->fullTransactionId))
6817 tgl@sss.pgh.pa.us 5196 : 5360 : AtSubCommit_childXids();
7907 5197 : 7266 : AfterTriggerEndSubXact(true);
7901 5198 : 7266 : AtSubCommit_Portals(s->subTransactionId,
5199 : 7266 : s->parent->subTransactionId,
1677 5200 : 7266 : s->parent->nestingLevel,
7947 5201 : 7266 : s->parent->curTransactionOwner);
7901 5202 : 7266 : AtEOSubXact_LargeObject(true, s->subTransactionId,
5203 : 7266 : s->parent->subTransactionId);
7947 5204 : 7266 : AtSubCommit_Notify();
5205 : :
7901 5206 : 7266 : CallSubXactCallbacks(SUBXACT_EVENT_COMMIT_SUB, s->subTransactionId,
5207 : 7266 : s->parent->subTransactionId);
5208 : :
7962 5209 : 7266 : ResourceOwnerRelease(s->curTransactionOwner,
5210 : : RESOURCE_RELEASE_BEFORE_LOCKS,
5211 : : true, false);
7901 5212 : 7266 : AtEOSubXact_RelationCache(true, s->subTransactionId,
5213 : 7266 : s->parent->subTransactionId);
558 akorotkov@postgresql 5214 : 7266 : AtEOSubXact_TypeCache();
7947 tgl@sss.pgh.pa.us 5215 : 7266 : AtEOSubXact_Inval(true);
7911 5216 : 7266 : AtSubCommit_smgr();
5217 : :
5218 : : /*
5219 : : * The only lock we actually release here is the subtransaction XID lock.
5220 : : */
7901 5221 : 7266 : CurrentResourceOwner = s->curTransactionOwner;
2595 tmunro@postgresql.or 5222 [ + + ]: 7266 : if (FullTransactionIdIsValid(s->fullTransactionId))
5223 : 5360 : XactLockTableDelete(XidFromFullTransactionId(s->fullTransactionId));
5224 : :
5225 : : /*
5226 : : * Other locks should get transferred to their parent resource owner.
5227 : : */
7923 tgl@sss.pgh.pa.us 5228 : 7266 : ResourceOwnerRelease(s->curTransactionOwner,
5229 : : RESOURCE_RELEASE_LOCKS,
5230 : : true, false);
7962 5231 : 7266 : ResourceOwnerRelease(s->curTransactionOwner,
5232 : : RESOURCE_RELEASE_AFTER_LOCKS,
5233 : : true, false);
5234 : :
6819 5235 : 7266 : AtEOXact_GUC(true, s->gucNestLevel);
7901 5236 : 7266 : AtEOSubXact_SPI(true, s->subTransactionId);
5237 : 7266 : AtEOSubXact_on_commit_actions(true, s->subTransactionId,
5238 : 7266 : s->parent->subTransactionId);
5239 : 7266 : AtEOSubXact_Namespace(true, s->subTransactionId,
5240 : 7266 : s->parent->subTransactionId);
5241 : 7266 : AtEOSubXact_Files(true, s->subTransactionId,
5242 : 7266 : s->parent->subTransactionId);
6949 5243 : 7266 : AtEOSubXact_HashTables(true, s->nestingLevel);
6918 5244 : 7266 : AtEOSubXact_PgStat(true, s->nestingLevel);
6567 alvherre@alvh.no-ip. 5245 : 7266 : AtSubCommit_Snapshot(s->nestingLevel);
5246 : :
5247 : : /*
5248 : : * We need to restore the upper transaction's read-only state, in case the
5249 : : * upper is read-write while the child is read-only; GUC will incorrectly
5250 : : * think it should leave the child state in place.
5251 : : */
7951 tgl@sss.pgh.pa.us 5252 : 7266 : XactReadOnly = s->prevXactReadOnly;
5253 : :
7962 5254 : 7266 : CurrentResourceOwner = s->parent->curTransactionOwner;
5255 : 7266 : CurTransactionResourceOwner = s->parent->curTransactionOwner;
7923 5256 : 7266 : ResourceOwnerDelete(s->curTransactionOwner);
7962 5257 : 7266 : s->curTransactionOwner = NULL;
5258 : :
7978 5259 : 7266 : AtSubCommit_Memory();
5260 : :
5261 : 7266 : s->state = TRANS_DEFAULT;
5262 : :
7901 5263 : 7266 : PopTransaction();
7978 5264 : 7266 : }
5265 : :
5266 : : /*
5267 : : * AbortSubTransaction
5268 : : */
5269 : : static void
5270 : 5380 : AbortSubTransaction(void)
5271 : : {
5272 : 5380 : TransactionState s = CurrentTransactionState;
5273 : :
5274 : : /* Prevent cancel/die interrupt while cleaning up */
5275 : 5380 : HOLD_INTERRUPTS();
5276 : :
5277 : : /* Make sure we have a valid memory context and resource owner */
7103 5278 : 5380 : AtSubAbort_Memory();
5279 : 5380 : AtSubAbort_ResourceOwner();
5280 : :
5281 : : /*
5282 : : * Release any LW locks we might be holding as quickly as possible.
5283 : : * (Regular locks, however, must be held till we finish aborting.)
5284 : : * Releasing LW locks is critical since we might try to grab them again
5285 : : * while cleaning up!
5286 : : *
5287 : : * FIXME This may be incorrect --- Are there some locks we should keep?
5288 : : * Buffer locks, for example? I don't think so but I'm not sure.
5289 : : */
7978 5290 : 5380 : LWLockReleaseAll();
5291 : :
3708 rhaas@postgresql.org 5292 : 5380 : pgstat_report_wait_end();
5293 : 5380 : pgstat_progress_end_command();
5294 : :
414 andres@anarazel.de 5295 : 5380 : pgaio_error_cleanup();
5296 : :
7978 tgl@sss.pgh.pa.us 5297 : 5380 : UnlockBuffers();
5298 : :
5299 : : /* Reset WAL record construction state */
4184 heikki.linnakangas@i 5300 : 5380 : XLogResetInsertion();
5301 : :
5302 : : /* Cancel condition variable sleep */
3057 rhaas@postgresql.org 5303 : 5380 : ConditionVariableCancelSleep();
5304 : :
5305 : : /*
5306 : : * Also clean up any open wait for lock, since the lock manager will choke
5307 : : * if we try to wait for another lock before doing this.
5308 : : */
5130 5309 : 5380 : LockErrorCleanup();
5310 : :
5311 : : /*
5312 : : * If any timeout events are still active, make sure the timeout interrupt
5313 : : * is scheduled. This covers possible loss of a timeout interrupt due to
5314 : : * longjmp'ing out of the SIGINT handler (see notes in handle_sig_alarm).
5315 : : * We delay this till after LockErrorCleanup so that we don't uselessly
5316 : : * reschedule lock or deadlock check timeouts.
5317 : : */
4540 tgl@sss.pgh.pa.us 5318 : 5380 : reschedule_timeouts();
5319 : :
5320 : : /*
5321 : : * Re-enable signals, in case we got here by longjmp'ing out of a signal
5322 : : * handler. We do this fairly early in the sequence so that the timeout
5323 : : * infrastructure will be functional if needed while aborting.
5324 : : */
1187 tmunro@postgresql.or 5325 : 5380 : sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
5326 : :
5327 : : /*
5328 : : * check the current transaction state
5329 : : */
7103 tgl@sss.pgh.pa.us 5330 : 5380 : ShowTransactionState("AbortSubTransaction");
5331 : :
5332 [ - + ]: 5380 : if (s->state != TRANS_INPROGRESS)
7103 tgl@sss.pgh.pa.us 5333 [ # # ]:UBC 0 : elog(WARNING, "AbortSubTransaction while in %s state",
5334 : : TransStateAsString(s->state));
5335 : :
7103 tgl@sss.pgh.pa.us 5336 :CBC 5380 : s->state = TRANS_ABORT;
5337 : :
5338 : : /*
5339 : : * Reset user ID which might have been changed transiently. (See notes in
5340 : : * AbortTransaction.)
5341 : : */
5991 5342 : 5380 : SetUserIdAndSecContext(s->prevUser, s->prevSecContext);
5343 : :
5344 : : /* Forget about any active REINDEX. */
2205 5345 : 5380 : ResetReindexState(s->nestingLevel);
5346 : :
5347 : : /* Reset logical streaming state. */
2096 akapila@postgresql.o 5348 : 5380 : ResetLogicalStreamingState();
5349 : :
5350 : : /*
5351 : : * No need for SnapBuildResetExportedSnapshotState() here, snapshot
5352 : : * exports are not supported in subtransactions.
5353 : : */
5354 : :
5355 : : /*
5356 : : * If this subxact has started any unfinished parallel operation, clean up
5357 : : * its workers and exit parallel mode. Don't warn about leaked resources.
5358 : : */
768 tgl@sss.pgh.pa.us 5359 : 5380 : AtEOSubXact_Parallel(false, s->subTransactionId);
5360 : 5380 : s->parallelModeLevel = 0;
5361 : :
5362 : : /*
5363 : : * We can skip all this stuff if the subxact failed before creating a
5364 : : * ResourceOwner...
5365 : : */
7901 5366 [ + - ]: 5380 : if (s->curTransactionOwner)
5367 : : {
5368 : 5380 : AfterTriggerEndSubXact(false);
5369 : 5380 : AtSubAbort_Portals(s->subTransactionId,
5370 : 5380 : s->parent->subTransactionId,
5371 : : s->curTransactionOwner,
5372 : 5380 : s->parent->curTransactionOwner);
5373 : 5380 : AtEOSubXact_LargeObject(false, s->subTransactionId,
5374 : 5380 : s->parent->subTransactionId);
5375 : 5380 : AtSubAbort_Notify();
5376 : :
5377 : : /* Advertise the fact that we aborted in pg_xact. */
6814 5378 : 5380 : (void) RecordTransactionAbort(true);
5379 : :
5380 : : /* Post-abort cleanup */
2595 tmunro@postgresql.or 5381 [ + + ]: 5380 : if (FullTransactionIdIsValid(s->fullTransactionId))
7901 tgl@sss.pgh.pa.us 5382 : 855 : AtSubAbort_childXids();
5383 : :
5384 : 5380 : CallSubXactCallbacks(SUBXACT_EVENT_ABORT_SUB, s->subTransactionId,
5385 : 5380 : s->parent->subTransactionId);
5386 : :
5387 : 5380 : ResourceOwnerRelease(s->curTransactionOwner,
5388 : : RESOURCE_RELEASE_BEFORE_LOCKS,
5389 : : false, false);
5390 : :
414 andres@anarazel.de 5391 : 5380 : AtEOXact_Aio(false);
7901 tgl@sss.pgh.pa.us 5392 : 5380 : AtEOSubXact_RelationCache(false, s->subTransactionId,
5393 : 5380 : s->parent->subTransactionId);
558 akorotkov@postgresql 5394 : 5380 : AtEOSubXact_TypeCache();
7901 tgl@sss.pgh.pa.us 5395 : 5380 : AtEOSubXact_Inval(false);
5396 : 5380 : ResourceOwnerRelease(s->curTransactionOwner,
5397 : : RESOURCE_RELEASE_LOCKS,
5398 : : false, false);
5399 : 5380 : ResourceOwnerRelease(s->curTransactionOwner,
5400 : : RESOURCE_RELEASE_AFTER_LOCKS,
5401 : : false, false);
5073 rhaas@postgresql.org 5402 : 5380 : AtSubAbort_smgr();
5403 : :
6819 tgl@sss.pgh.pa.us 5404 : 5380 : AtEOXact_GUC(false, s->gucNestLevel);
7901 5405 : 5380 : AtEOSubXact_SPI(false, s->subTransactionId);
5406 : 5380 : AtEOSubXact_on_commit_actions(false, s->subTransactionId,
5407 : 5380 : s->parent->subTransactionId);
5408 : 5380 : AtEOSubXact_Namespace(false, s->subTransactionId,
5409 : 5380 : s->parent->subTransactionId);
5410 : 5380 : AtEOSubXact_Files(false, s->subTransactionId,
5411 : 5380 : s->parent->subTransactionId);
6949 5412 : 5380 : AtEOSubXact_HashTables(false, s->nestingLevel);
6918 5413 : 5380 : AtEOSubXact_PgStat(false, s->nestingLevel);
6567 alvherre@alvh.no-ip. 5414 : 5380 : AtSubAbort_Snapshot(s->nestingLevel);
5415 : : }
5416 : :
5417 : : /*
5418 : : * Restore the upper transaction's read-only state, too. This should be
5419 : : * redundant with GUC's cleanup but we may as well do it for consistency
5420 : : * with the commit case.
5421 : : */
7951 tgl@sss.pgh.pa.us 5422 : 5380 : XactReadOnly = s->prevXactReadOnly;
5423 : :
7978 5424 [ - + ]: 5380 : RESUME_INTERRUPTS();
5425 : 5380 : }
5426 : :
5427 : : /*
5428 : : * CleanupSubTransaction
5429 : : *
5430 : : * The caller has to make sure to always reassign CurrentTransactionState
5431 : : * if it has a local pointer to it after calling this function.
5432 : : */
5433 : : static void
5434 : 5380 : CleanupSubTransaction(void)
5435 : : {
5436 : 5380 : TransactionState s = CurrentTransactionState;
5437 : :
5438 : 5380 : ShowTransactionState("CleanupSubTransaction");
5439 : :
5440 [ - + ]: 5380 : if (s->state != TRANS_ABORT)
7951 tgl@sss.pgh.pa.us 5441 [ # # ]:UBC 0 : elog(WARNING, "CleanupSubTransaction while in %s state",
5442 : : TransStateAsString(s->state));
5443 : :
7901 tgl@sss.pgh.pa.us 5444 :CBC 5380 : AtSubCleanup_Portals(s->subTransactionId);
5445 : :
7962 5446 : 5380 : CurrentResourceOwner = s->parent->curTransactionOwner;
5447 : 5380 : CurTransactionResourceOwner = s->parent->curTransactionOwner;
7901 5448 [ + - ]: 5380 : if (s->curTransactionOwner)
5449 : 5380 : ResourceOwnerDelete(s->curTransactionOwner);
7962 5450 : 5380 : s->curTransactionOwner = NULL;
5451 : :
7978 5452 : 5380 : AtSubCleanup_Memory();
5453 : :
5454 : 5380 : s->state = TRANS_DEFAULT;
5455 : :
7901 5456 : 5380 : PopTransaction();
7978 5457 : 5380 : }
5458 : :
5459 : : /*
5460 : : * PushTransaction
5461 : : * Create transaction state stack entry for a subtransaction
5462 : : *
5463 : : * The caller has to make sure to always reassign CurrentTransactionState
5464 : : * if it has a local pointer to it after calling this function.
5465 : : */
5466 : : static void
5467 : 12646 : PushTransaction(void)
5468 : : {
7919 bruce@momjian.us 5469 : 12646 : TransactionState p = CurrentTransactionState;
5470 : : TransactionState s;
5471 : :
5472 : : /*
5473 : : * We keep subtransaction state nodes in TopTransactionContext.
5474 : : */
5475 : : s = (TransactionState)
7978 tgl@sss.pgh.pa.us 5476 : 12646 : MemoryContextAllocZero(TopTransactionContext,
5477 : : sizeof(TransactionStateData));
5478 : :
5479 : : /*
5480 : : * Assign a subtransaction ID, watching out for counter wraparound.
5481 : : */
7901 5482 : 12646 : currentSubTransactionId += 1;
5483 [ - + ]: 12646 : if (currentSubTransactionId == InvalidSubTransactionId)
5484 : : {
7901 tgl@sss.pgh.pa.us 5485 :UBC 0 : currentSubTransactionId -= 1;
5486 : 0 : pfree(s);
5487 [ # # ]: 0 : ereport(ERROR,
5488 : : (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5489 : : errmsg("cannot have more than 2^32-1 subtransactions in a transaction")));
5490 : : }
5491 : :
5492 : : /*
5493 : : * We can now stack a minimally valid subtransaction without fear of
5494 : : * failure.
5495 : : */
2595 tmunro@postgresql.or 5496 :CBC 12646 : s->fullTransactionId = InvalidFullTransactionId; /* until assigned */
7901 tgl@sss.pgh.pa.us 5497 : 12646 : s->subTransactionId = currentSubTransactionId;
7978 5498 : 12646 : s->parent = p;
5499 : 12646 : s->nestingLevel = p->nestingLevel + 1;
6819 5500 : 12646 : s->gucNestLevel = NewGUCNestLevel();
7952 5501 : 12646 : s->savepointLevel = p->savepointLevel;
7978 5502 : 12646 : s->state = TRANS_DEFAULT;
5503 : 12646 : s->blockState = TBLOCK_SUBBEGIN;
5991 5504 : 12646 : GetUserIdAndSecContext(&s->prevUser, &s->prevSecContext);
7901 5505 : 12646 : s->prevXactReadOnly = XactReadOnly;
875 michael@paquier.xyz 5506 : 12646 : s->startedInRecovery = p->startedInRecovery;
4023 rhaas@postgresql.org 5507 : 12646 : s->parallelModeLevel = 0;
768 tgl@sss.pgh.pa.us 5508 [ + + - + ]: 12646 : s->parallelChildXact = (p->parallelModeLevel != 0 || p->parallelChildXact);
1645 akapila@postgresql.o 5509 : 12646 : s->topXidLogged = false;
5510 : :
7901 tgl@sss.pgh.pa.us 5511 : 12646 : CurrentTransactionState = s;
5512 : :
5513 : : /*
5514 : : * AbortSubTransaction and CleanupSubTransaction have to be able to cope
5515 : : * with the subtransaction from here on out; in particular they should not
5516 : : * assume that it necessarily has a transaction context, resource owner,
5517 : : * or XID.
5518 : : */
7978 5519 : 12646 : }
5520 : :
5521 : : /*
5522 : : * PopTransaction
5523 : : * Pop back to parent transaction state
5524 : : *
5525 : : * The caller has to make sure to always reassign CurrentTransactionState
5526 : : * if it has a local pointer to it after calling this function.
5527 : : */
5528 : : static void
5529 : 12646 : PopTransaction(void)
5530 : : {
5531 : 12646 : TransactionState s = CurrentTransactionState;
5532 : :
5533 [ - + ]: 12646 : if (s->state != TRANS_DEFAULT)
7951 tgl@sss.pgh.pa.us 5534 [ # # ]:UBC 0 : elog(WARNING, "PopTransaction while in %s state",
5535 : : TransStateAsString(s->state));
5536 : :
7978 tgl@sss.pgh.pa.us 5537 [ - + ]:CBC 12646 : if (s->parent == NULL)
7978 tgl@sss.pgh.pa.us 5538 [ # # ]:UBC 0 : elog(FATAL, "PopTransaction with no parent");
5539 : :
7978 tgl@sss.pgh.pa.us 5540 :CBC 12646 : CurrentTransactionState = s->parent;
5541 : :
5542 : : /* Let's just make sure CurTransactionContext is good */
5543 : 12646 : CurTransactionContext = s->parent->curTransactionContext;
5544 : 12646 : MemoryContextSwitchTo(CurTransactionContext);
5545 : :
5546 : : /* Ditto for ResourceOwner links */
7962 5547 : 12646 : CurTransactionResourceOwner = s->parent->curTransactionOwner;
5548 : 12646 : CurrentResourceOwner = s->parent->curTransactionOwner;
5549 : :
5550 : : /* Free the old child structure */
7952 5551 [ + + ]: 12646 : if (s->name)
5552 : 2149 : pfree(s->name);
7978 5553 : 12646 : pfree(s);
5554 : 12646 : }
5555 : :
5556 : : /*
5557 : : * EstimateTransactionStateSpace
5558 : : * Estimate the amount of space that will be needed by
5559 : : * SerializeTransactionState. It would be OK to overestimate slightly,
5560 : : * but it's simple for us to work out the precise value, so we do.
5561 : : */
5562 : : Size
4023 rhaas@postgresql.org 5563 : 680 : EstimateTransactionStateSpace(void)
5564 : : {
5565 : : TransactionState s;
2595 tmunro@postgresql.or 5566 : 680 : Size nxids = 0;
5567 : 680 : Size size = SerializedTransactionStateHeaderSize;
5568 : :
4023 rhaas@postgresql.org 5569 [ + + ]: 3052 : for (s = CurrentTransactionState; s != NULL; s = s->parent)
5570 : : {
2595 tmunro@postgresql.or 5571 [ + + ]: 2372 : if (FullTransactionIdIsValid(s->fullTransactionId))
4023 rhaas@postgresql.org 5572 : 1359 : nxids = add_size(nxids, 1);
5573 : 2372 : nxids = add_size(nxids, s->nChildXids);
5574 : : }
5575 : :
2580 tmunro@postgresql.or 5576 : 680 : return add_size(size, mul_size(sizeof(TransactionId), nxids));
5577 : : }
5578 : :
5579 : : /*
5580 : : * SerializeTransactionState
5581 : : * Write out relevant details of our transaction state that will be
5582 : : * needed by a parallel worker.
5583 : : *
5584 : : * We need to save and restore XactDeferrable, XactIsoLevel, and the XIDs
5585 : : * associated with this transaction. These are serialized into a
5586 : : * caller-supplied buffer big enough to hold the number of bytes reported by
5587 : : * EstimateTransactionStateSpace(). We emit the XIDs in sorted order for the
5588 : : * convenience of the receiving process.
5589 : : */
5590 : : void
4023 rhaas@postgresql.org 5591 : 680 : SerializeTransactionState(Size maxsize, char *start_address)
5592 : : {
5593 : : TransactionState s;
4000 bruce@momjian.us 5594 : 680 : Size nxids = 0;
5595 : 680 : Size i = 0;
5596 : : TransactionId *workspace;
5597 : : SerializedTransactionState *result;
5598 : :
2595 tmunro@postgresql.or 5599 : 680 : result = (SerializedTransactionState *) start_address;
5600 : :
5601 : 680 : result->xactIsoLevel = XactIsoLevel;
5602 : 680 : result->xactDeferrable = XactDeferrable;
5603 : 680 : result->topFullTransactionId = XactTopFullTransactionId;
5604 : 680 : result->currentFullTransactionId =
5605 : 680 : CurrentTransactionState->fullTransactionId;
5606 : 680 : result->currentCommandId = currentCommandId;
5607 : :
5608 : : /*
5609 : : * If we're running in a parallel worker and launching a parallel worker
5610 : : * of our own, we can just pass along the information that was passed to
5611 : : * us.
5612 : : */
4023 rhaas@postgresql.org 5613 [ - + ]: 680 : if (nParallelCurrentXids > 0)
5614 : : {
2595 tmunro@postgresql.or 5615 :UBC 0 : result->nParallelCurrentXids = nParallelCurrentXids;
5616 : 0 : memcpy(&result->parallelCurrentXids[0], ParallelCurrentXids,
5617 : : nParallelCurrentXids * sizeof(TransactionId));
4023 rhaas@postgresql.org 5618 : 0 : return;
5619 : : }
5620 : :
5621 : : /*
5622 : : * OK, we need to generate a sorted list of XIDs that our workers should
5623 : : * view as current. First, figure out how many there are.
5624 : : */
4023 rhaas@postgresql.org 5625 [ + + ]:CBC 3052 : for (s = CurrentTransactionState; s != NULL; s = s->parent)
5626 : : {
2595 tmunro@postgresql.or 5627 [ + + ]: 2372 : if (FullTransactionIdIsValid(s->fullTransactionId))
4023 rhaas@postgresql.org 5628 : 1359 : nxids = add_size(nxids, 1);
5629 : 2372 : nxids = add_size(nxids, s->nChildXids);
5630 : : }
2595 tmunro@postgresql.or 5631 [ - + ]: 680 : Assert(SerializedTransactionStateHeaderSize + nxids * sizeof(TransactionId)
5632 : : <= maxsize);
5633 : :
5634 : : /* Copy them to our scratch space. */
4023 rhaas@postgresql.org 5635 : 680 : workspace = palloc(nxids * sizeof(TransactionId));
5636 [ + + ]: 3052 : for (s = CurrentTransactionState; s != NULL; s = s->parent)
5637 : : {
2595 tmunro@postgresql.or 5638 [ + + ]: 2372 : if (FullTransactionIdIsValid(s->fullTransactionId))
5639 : 1359 : workspace[i++] = XidFromFullTransactionId(s->fullTransactionId);
1524 tgl@sss.pgh.pa.us 5640 [ - + ]: 2372 : if (s->nChildXids > 0)
1524 tgl@sss.pgh.pa.us 5641 :UBC 0 : memcpy(&workspace[i], s->childXids,
5642 : 0 : s->nChildXids * sizeof(TransactionId));
4023 rhaas@postgresql.org 5643 :CBC 2372 : i += s->nChildXids;
5644 : : }
5645 [ - + ]: 680 : Assert(i == nxids);
5646 : :
5647 : : /* Sort them. */
5648 : 680 : qsort(workspace, nxids, sizeof(TransactionId), xidComparator);
5649 : :
5650 : : /* Copy data into output area. */
2595 tmunro@postgresql.or 5651 : 680 : result->nParallelCurrentXids = nxids;
5652 : 680 : memcpy(&result->parallelCurrentXids[0], workspace,
5653 : : nxids * sizeof(TransactionId));
5654 : : }
5655 : :
5656 : : /*
5657 : : * StartParallelWorkerTransaction
5658 : : * Start a parallel worker transaction, restoring the relevant
5659 : : * transaction state serialized by SerializeTransactionState.
5660 : : */
5661 : : void
4023 rhaas@postgresql.org 5662 : 2008 : StartParallelWorkerTransaction(char *tstatespace)
5663 : : {
5664 : : SerializedTransactionState *tstate;
5665 : :
5666 [ - + ]: 2008 : Assert(CurrentTransactionState->blockState == TBLOCK_DEFAULT);
5667 : 2008 : StartTransaction();
5668 : :
2595 tmunro@postgresql.or 5669 : 2008 : tstate = (SerializedTransactionState *) tstatespace;
5670 : 2008 : XactIsoLevel = tstate->xactIsoLevel;
5671 : 2008 : XactDeferrable = tstate->xactDeferrable;
5672 : 2008 : XactTopFullTransactionId = tstate->topFullTransactionId;
5673 : 2008 : CurrentTransactionState->fullTransactionId =
5674 : : tstate->currentFullTransactionId;
5675 : 2008 : currentCommandId = tstate->currentCommandId;
5676 : 2008 : nParallelCurrentXids = tstate->nParallelCurrentXids;
5677 : 2008 : ParallelCurrentXids = &tstate->parallelCurrentXids[0];
5678 : :
4023 rhaas@postgresql.org 5679 : 2008 : CurrentTransactionState->blockState = TBLOCK_PARALLEL_INPROGRESS;
5680 : 2008 : }
5681 : :
5682 : : /*
5683 : : * EndParallelWorkerTransaction
5684 : : * End a parallel worker transaction.
5685 : : */
5686 : : void
5687 : 2000 : EndParallelWorkerTransaction(void)
5688 : : {
5689 [ - + ]: 2000 : Assert(CurrentTransactionState->blockState == TBLOCK_PARALLEL_INPROGRESS);
5690 : 2000 : CommitTransaction();
5691 : 2000 : CurrentTransactionState->blockState = TBLOCK_DEFAULT;
5692 : 2000 : }
5693 : :
5694 : : /*
5695 : : * ShowTransactionState
5696 : : * Debug support
5697 : : */
5698 : : static void
7978 tgl@sss.pgh.pa.us 5699 : 839410 : ShowTransactionState(const char *str)
5700 : : {
5701 : : /* skip work if message will definitely not be printed */
1989 5702 [ - + ]: 839410 : if (message_level_is_interesting(DEBUG5))
3456 rhaas@postgresql.org 5703 :UBC 0 : ShowTransactionStateRec(str, CurrentTransactionState);
7978 tgl@sss.pgh.pa.us 5704 :CBC 839410 : }
5705 : :
5706 : : /*
5707 : : * ShowTransactionStateRec
5708 : : * Recursive subroutine for ShowTransactionState
5709 : : */
5710 : : static void
3456 rhaas@postgresql.org 5711 :UBC 0 : ShowTransactionStateRec(const char *str, TransactionState s)
5712 : : {
5713 : : StringInfoData buf;
5714 : :
788 akorotkov@postgresql 5715 [ # # ]: 0 : if (s->parent)
5716 : : {
5717 : : /*
5718 : : * Since this function recurses, it could be driven to stack overflow.
5719 : : * This is just a debugging aid, so we can leave out some details
5720 : : * instead of erroring out with check_stack_depth().
5721 : : */
5722 [ # # ]: 0 : if (stack_is_too_deep())
5723 [ # # ]: 0 : ereport(DEBUG5,
5724 : : (errmsg_internal("%s(%d): parent omitted to avoid stack overflow",
5725 : : str, s->nestingLevel)));
5726 : : else
5727 : 0 : ShowTransactionStateRec(str, s->parent);
5728 : : }
5729 : :
5730 : 0 : initStringInfo(&buf);
6623 tgl@sss.pgh.pa.us 5731 [ # # ]: 0 : if (s->nChildXids > 0)
5732 : : {
5733 : : int i;
5734 : :
3456 rhaas@postgresql.org 5735 : 0 : appendStringInfo(&buf, ", children: %u", s->childXids[0]);
6623 tgl@sss.pgh.pa.us 5736 [ # # ]: 0 : for (i = 1; i < s->nChildXids; i++)
5737 : 0 : appendStringInfo(&buf, " %u", s->childXids[i]);
5738 : : }
3456 rhaas@postgresql.org 5739 [ # # # # : 0 : ereport(DEBUG5,
# # ]
5740 : : (errmsg_internal("%s(%d) name: %s; blockState: %s; state: %s, xid/subid/cid: %u/%u/%u%s%s",
5741 : : str, s->nestingLevel,
5742 : : s->name ? s->name : "unnamed",
5743 : : BlockStateAsString(s->blockState),
5744 : : TransStateAsString(s->state),
5745 : : XidFromFullTransactionId(s->fullTransactionId),
5746 : : s->subTransactionId,
5747 : : currentCommandId,
5748 : : currentCommandIdUsed ? " (used)" : "",
5749 : : buf.data)));
6623 tgl@sss.pgh.pa.us 5750 : 0 : pfree(buf.data);
7978 5751 : 0 : }
5752 : :
5753 : : /*
5754 : : * BlockStateAsString
5755 : : * Debug support
5756 : : */
5757 : : static const char *
5758 : 0 : BlockStateAsString(TBlockState blockState)
5759 : : {
7952 5760 [ # # # # : 0 : switch (blockState)
# # # # #
# # # # #
# # # # #
# # ]
5761 : : {
7978 5762 : 0 : case TBLOCK_DEFAULT:
5763 : 0 : return "DEFAULT";
5764 : 0 : case TBLOCK_STARTED:
5765 : 0 : return "STARTED";
5766 : 0 : case TBLOCK_BEGIN:
5767 : 0 : return "BEGIN";
5768 : 0 : case TBLOCK_INPROGRESS:
5769 : 0 : return "INPROGRESS";
3162 5770 : 0 : case TBLOCK_IMPLICIT_INPROGRESS:
5771 : 0 : return "IMPLICIT_INPROGRESS";
4023 rhaas@postgresql.org 5772 : 0 : case TBLOCK_PARALLEL_INPROGRESS:
5773 : 0 : return "PARALLEL_INPROGRESS";
7978 tgl@sss.pgh.pa.us 5774 : 0 : case TBLOCK_END:
5775 : 0 : return "END";
5776 : 0 : case TBLOCK_ABORT:
5777 : 0 : return "ABORT";
7901 5778 : 0 : case TBLOCK_ABORT_END:
2999 peter_e@gmx.net 5779 : 0 : return "ABORT_END";
7901 tgl@sss.pgh.pa.us 5780 : 0 : case TBLOCK_ABORT_PENDING:
2999 peter_e@gmx.net 5781 : 0 : return "ABORT_PENDING";
7627 tgl@sss.pgh.pa.us 5782 : 0 : case TBLOCK_PREPARE:
5783 : 0 : return "PREPARE";
7978 5784 : 0 : case TBLOCK_SUBBEGIN:
2999 peter_e@gmx.net 5785 : 0 : return "SUBBEGIN";
7978 tgl@sss.pgh.pa.us 5786 : 0 : case TBLOCK_SUBINPROGRESS:
2999 peter_e@gmx.net 5787 : 0 : return "SUBINPROGRESS";
5404 simon@2ndQuadrant.co 5788 : 0 : case TBLOCK_SUBRELEASE:
2999 peter_e@gmx.net 5789 : 0 : return "SUBRELEASE";
5404 simon@2ndQuadrant.co 5790 : 0 : case TBLOCK_SUBCOMMIT:
2999 peter_e@gmx.net 5791 : 0 : return "SUBCOMMIT";
7978 tgl@sss.pgh.pa.us 5792 : 0 : case TBLOCK_SUBABORT:
2999 peter_e@gmx.net 5793 : 0 : return "SUBABORT";
7901 tgl@sss.pgh.pa.us 5794 : 0 : case TBLOCK_SUBABORT_END:
2999 peter_e@gmx.net 5795 : 0 : return "SUBABORT_END";
7952 tgl@sss.pgh.pa.us 5796 : 0 : case TBLOCK_SUBABORT_PENDING:
2999 peter_e@gmx.net 5797 : 0 : return "SUBABORT_PENDING";
7901 tgl@sss.pgh.pa.us 5798 : 0 : case TBLOCK_SUBRESTART:
2999 peter_e@gmx.net 5799 : 0 : return "SUBRESTART";
7901 tgl@sss.pgh.pa.us 5800 : 0 : case TBLOCK_SUBABORT_RESTART:
2999 peter_e@gmx.net 5801 : 0 : return "SUBABORT_RESTART";
5802 : : }
7978 tgl@sss.pgh.pa.us 5803 : 0 : return "UNRECOGNIZED";
5804 : : }
5805 : :
5806 : : /*
5807 : : * TransStateAsString
5808 : : * Debug support
5809 : : */
5810 : : static const char *
5811 : 0 : TransStateAsString(TransState state)
5812 : : {
7952 5813 [ # # # # : 0 : switch (state)
# # # ]
5814 : : {
7978 5815 : 0 : case TRANS_DEFAULT:
5816 : 0 : return "DEFAULT";
5817 : 0 : case TRANS_START:
5818 : 0 : return "START";
7627 5819 : 0 : case TRANS_INPROGRESS:
2999 peter_e@gmx.net 5820 : 0 : return "INPROGRESS";
7978 tgl@sss.pgh.pa.us 5821 : 0 : case TRANS_COMMIT:
5822 : 0 : return "COMMIT";
5823 : 0 : case TRANS_ABORT:
5824 : 0 : return "ABORT";
7627 5825 : 0 : case TRANS_PREPARE:
5826 : 0 : return "PREPARE";
5827 : : }
7978 5828 : 0 : return "UNRECOGNIZED";
5829 : : }
5830 : :
5831 : : /*
5832 : : * xactGetCommittedChildren
5833 : : *
5834 : : * Gets the list of committed children of the current transaction. The return
5835 : : * value is the number of child transactions. *ptr is set to point to an
5836 : : * array of TransactionIds. The array is allocated in TopTransactionContext;
5837 : : * the caller should *not* pfree() it (this is a change from pre-8.4 code!).
5838 : : * If there are no subxacts, *ptr is set to NULL.
5839 : : */
5840 : : int
7962 tgl@sss.pgh.pa.us 5841 :CBC 393868 : xactGetCommittedChildren(TransactionId **ptr)
5842 : : {
7919 bruce@momjian.us 5843 : 393868 : TransactionState s = CurrentTransactionState;
5844 : :
6623 tgl@sss.pgh.pa.us 5845 [ + + ]: 393868 : if (s->nChildXids == 0)
7978 5846 : 393225 : *ptr = NULL;
5847 : : else
6623 5848 : 643 : *ptr = s->childXids;
5849 : :
5850 : 393868 : return s->nChildXids;
5851 : : }
5852 : :
5853 : : /*
5854 : : * XLOG support routines
5855 : : */
5856 : :
5857 : :
5858 : : /*
5859 : : * Log the commit record for a plain or twophase transaction commit.
5860 : : *
5861 : : * A 2pc commit will be emitted when twophase_xid is valid, a plain one
5862 : : * otherwise.
5863 : : */
5864 : : XLogRecPtr
4069 andres@anarazel.de 5865 : 156830 : XactLogCommitRecord(TimestampTz commit_time,
5866 : : int nsubxacts, TransactionId *subxacts,
5867 : : int nrels, RelFileLocator *rels,
5868 : : int ndroppedstats, xl_xact_stats_item *droppedstats,
5869 : : int nmsgs, SharedInvalidationMessage *msgs,
5870 : : bool relcacheInval,
5871 : : int xactflags, TransactionId twophase_xid,
5872 : : const char *twophase_gid)
5873 : : {
5874 : : xl_xact_commit xlrec;
5875 : : xl_xact_xinfo xl_xinfo;
5876 : : xl_xact_dbinfo xl_dbinfo;
5877 : : xl_xact_subxacts xl_subxacts;
5878 : : xl_xact_relfilelocators xl_relfilelocators;
5879 : : xl_xact_stats_items xl_dropped_stats;
5880 : : xl_xact_invals xl_invals;
5881 : : xl_xact_twophase xl_twophase;
5882 : : xl_xact_origin xl_origin;
5883 : : uint8 info;
5884 : :
5885 [ - + ]: 156830 : Assert(CritSectionCount > 0);
5886 : :
5887 : 156830 : xl_xinfo.xinfo = 0;
5888 : :
5889 : : /* decide between a plain and 2pc commit */
5890 [ + + ]: 156830 : if (!TransactionIdIsValid(twophase_xid))
5891 : 156575 : info = XLOG_XACT_COMMIT;
5892 : : else
5893 : 255 : info = XLOG_XACT_COMMIT_PREPARED;
5894 : :
5895 : : /* First figure out and collect all the information needed */
5896 : :
5897 : 156830 : xlrec.xact_time = commit_time;
5898 : :
5899 [ + + ]: 156830 : if (relcacheInval)
5900 : 4755 : xl_xinfo.xinfo |= XACT_COMPLETION_UPDATE_RELCACHE_FILE;
5901 [ + + ]: 156830 : if (forceSyncCommit)
5902 : 567 : xl_xinfo.xinfo |= XACT_COMPLETION_FORCE_SYNC_COMMIT;
3331 simon@2ndQuadrant.co 5903 [ + + ]: 156830 : if ((xactflags & XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK))
5904 : 64669 : xl_xinfo.xinfo |= XACT_XINFO_HAS_AE_LOCKS;
5905 : :
5906 : : /*
5907 : : * Check if the caller would like to ask standbys for immediate feedback
5908 : : * once this commit is applied.
5909 : : */
3689 rhaas@postgresql.org 5910 [ + + ]: 156830 : if (synchronous_commit >= SYNCHRONOUS_COMMIT_REMOTE_APPLY)
5911 : 2 : xl_xinfo.xinfo |= XACT_COMPLETION_APPLY_FEEDBACK;
5912 : :
5913 : : /*
5914 : : * Relcache invalidations requires information about the current database
5915 : : * and so does logical decoding.
5916 : : */
4069 andres@anarazel.de 5917 [ + + + + : 156830 : if (nmsgs > 0 || XLogLogicalInfoActive())
+ + ]
5918 : : {
5919 : 112769 : xl_xinfo.xinfo |= XACT_XINFO_HAS_DBINFO;
5920 : 112769 : xl_dbinfo.dbId = MyDatabaseId;
5921 : 112769 : xl_dbinfo.tsId = MyDatabaseTableSpace;
5922 : : }
5923 : :
5924 [ + + ]: 156830 : if (nsubxacts > 0)
5925 : : {
5926 : 539 : xl_xinfo.xinfo |= XACT_XINFO_HAS_SUBXACTS;
5927 : 539 : xl_subxacts.nsubxacts = nsubxacts;
5928 : : }
5929 : :
5930 [ + + ]: 156830 : if (nrels > 0)
5931 : : {
1399 rhaas@postgresql.org 5932 : 12514 : xl_xinfo.xinfo |= XACT_XINFO_HAS_RELFILELOCATORS;
5933 : 12514 : xl_relfilelocators.nrels = nrels;
2087 heikki.linnakangas@i 5934 : 12514 : info |= XLR_SPECIAL_REL_UPDATE;
5935 : : }
5936 : :
1490 andres@anarazel.de 5937 [ + + ]: 156830 : if (ndroppedstats > 0)
5938 : : {
5939 : 14861 : xl_xinfo.xinfo |= XACT_XINFO_HAS_DROPPED_STATS;
5940 : 14861 : xl_dropped_stats.nitems = ndroppedstats;
5941 : : }
5942 : :
4069 5943 [ + + ]: 156830 : if (nmsgs > 0)
5944 : : {
5945 : 111834 : xl_xinfo.xinfo |= XACT_XINFO_HAS_INVALS;
5946 : 111834 : xl_invals.nmsgs = nmsgs;
5947 : : }
5948 : :
5949 [ + + ]: 156830 : if (TransactionIdIsValid(twophase_xid))
5950 : : {
5951 : 255 : xl_xinfo.xinfo |= XACT_XINFO_HAS_TWOPHASE;
5952 : 255 : xl_twophase.xid = twophase_xid;
2960 simon@2ndQuadrant.co 5953 [ - + ]: 255 : Assert(twophase_gid != NULL);
5954 : :
5955 [ + + - + ]: 255 : if (XLogLogicalInfoActive())
5956 : 41 : xl_xinfo.xinfo |= XACT_XINFO_HAS_GID;
5957 : : }
5958 : :
5959 : : /* dump transaction origin information */
97 msawada@postgresql.o 5960 [ + + ]:GNC 156830 : if (replorigin_xact_state.origin != InvalidReplOriginId)
5961 : : {
4024 andres@anarazel.de 5962 :CBC 1093 : xl_xinfo.xinfo |= XACT_XINFO_HAS_ORIGIN;
5963 : :
97 msawada@postgresql.o 5964 :GNC 1093 : xl_origin.origin_lsn = replorigin_xact_state.origin_lsn;
5965 : 1093 : xl_origin.origin_timestamp = replorigin_xact_state.origin_timestamp;
5966 : : }
5967 : :
4069 andres@anarazel.de 5968 [ + + ]:CBC 156830 : if (xl_xinfo.xinfo != 0)
5969 : 115825 : info |= XLOG_XACT_HAS_INFO;
5970 : :
5971 : : /* Then include all the collected data into the commit record. */
5972 : :
5973 : 156830 : XLogBeginInsert();
5974 : :
448 peter@eisentraut.org 5975 : 156830 : XLogRegisterData(&xlrec, sizeof(xl_xact_commit));
5976 : :
4069 andres@anarazel.de 5977 [ + + ]: 156830 : if (xl_xinfo.xinfo != 0)
448 peter@eisentraut.org 5978 : 115825 : XLogRegisterData(&xl_xinfo.xinfo, sizeof(xl_xinfo.xinfo));
5979 : :
4069 andres@anarazel.de 5980 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_DBINFO)
448 peter@eisentraut.org 5981 : 112769 : XLogRegisterData(&xl_dbinfo, sizeof(xl_dbinfo));
5982 : :
4069 andres@anarazel.de 5983 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_SUBXACTS)
5984 : : {
448 peter@eisentraut.org 5985 : 539 : XLogRegisterData(&xl_subxacts,
5986 : : MinSizeOfXactSubxacts);
5987 : 539 : XLogRegisterData(subxacts,
5988 : : nsubxacts * sizeof(TransactionId));
5989 : : }
5990 : :
1399 rhaas@postgresql.org 5991 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_RELFILELOCATORS)
5992 : : {
448 peter@eisentraut.org 5993 : 12514 : XLogRegisterData(&xl_relfilelocators,
5994 : : MinSizeOfXactRelfileLocators);
5995 : 12514 : XLogRegisterData(rels,
5996 : : nrels * sizeof(RelFileLocator));
5997 : : }
5998 : :
1490 andres@anarazel.de 5999 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_DROPPED_STATS)
6000 : : {
448 peter@eisentraut.org 6001 : 14861 : XLogRegisterData(&xl_dropped_stats,
6002 : : MinSizeOfXactStatsItems);
6003 : 14861 : XLogRegisterData(droppedstats,
6004 : : ndroppedstats * sizeof(xl_xact_stats_item));
6005 : : }
6006 : :
4069 andres@anarazel.de 6007 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_INVALS)
6008 : : {
448 peter@eisentraut.org 6009 : 111834 : XLogRegisterData(&xl_invals, MinSizeOfXactInvals);
6010 : 111834 : XLogRegisterData(msgs,
6011 : : nmsgs * sizeof(SharedInvalidationMessage));
6012 : : }
6013 : :
4069 andres@anarazel.de 6014 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_TWOPHASE)
6015 : : {
448 peter@eisentraut.org 6016 : 255 : XLogRegisterData(&xl_twophase, sizeof(xl_xact_twophase));
2960 simon@2ndQuadrant.co 6017 [ + + ]: 255 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_GID)
609 peter@eisentraut.org 6018 : 41 : XLogRegisterData(twophase_gid, strlen(twophase_gid) + 1);
6019 : : }
6020 : :
4024 andres@anarazel.de 6021 [ + + ]: 156830 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_ORIGIN)
448 peter@eisentraut.org 6022 : 1093 : XLogRegisterData(&xl_origin, sizeof(xl_xact_origin));
6023 : :
6024 : : /* we allow filtering by xacts */
3421 andres@anarazel.de 6025 : 156830 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
6026 : :
4069 6027 : 156830 : return XLogInsert(RM_XACT_ID, info);
6028 : : }
6029 : :
6030 : : /*
6031 : : * Log the commit record for a plain or twophase transaction abort.
6032 : : *
6033 : : * A 2pc abort will be emitted when twophase_xid is valid, a plain one
6034 : : * otherwise.
6035 : : */
6036 : : XLogRecPtr
6037 : 9347 : XactLogAbortRecord(TimestampTz abort_time,
6038 : : int nsubxacts, TransactionId *subxacts,
6039 : : int nrels, RelFileLocator *rels,
6040 : : int ndroppedstats, xl_xact_stats_item *droppedstats,
6041 : : int xactflags, TransactionId twophase_xid,
6042 : : const char *twophase_gid)
6043 : : {
6044 : : xl_xact_abort xlrec;
6045 : : xl_xact_xinfo xl_xinfo;
6046 : : xl_xact_subxacts xl_subxacts;
6047 : : xl_xact_relfilelocators xl_relfilelocators;
6048 : : xl_xact_stats_items xl_dropped_stats;
6049 : : xl_xact_twophase xl_twophase;
6050 : : xl_xact_dbinfo xl_dbinfo;
6051 : : xl_xact_origin xl_origin;
6052 : :
6053 : : uint8 info;
6054 : :
6055 [ - + ]: 9347 : Assert(CritSectionCount > 0);
6056 : :
6057 : 9347 : xl_xinfo.xinfo = 0;
6058 : :
6059 : : /* decide between a plain and 2pc abort */
6060 [ + + ]: 9347 : if (!TransactionIdIsValid(twophase_xid))
6061 : 9299 : info = XLOG_XACT_ABORT;
6062 : : else
6063 : 48 : info = XLOG_XACT_ABORT_PREPARED;
6064 : :
6065 : :
6066 : : /* First figure out and collect all the information needed */
6067 : :
6068 : 9347 : xlrec.xact_time = abort_time;
6069 : :
3331 simon@2ndQuadrant.co 6070 [ + + ]: 9347 : if ((xactflags & XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK))
6071 : 5224 : xl_xinfo.xinfo |= XACT_XINFO_HAS_AE_LOCKS;
6072 : :
4069 andres@anarazel.de 6073 [ + + ]: 9347 : if (nsubxacts > 0)
6074 : : {
6075 : 108 : xl_xinfo.xinfo |= XACT_XINFO_HAS_SUBXACTS;
6076 : 108 : xl_subxacts.nsubxacts = nsubxacts;
6077 : : }
6078 : :
6079 [ + + ]: 9347 : if (nrels > 0)
6080 : : {
1399 rhaas@postgresql.org 6081 : 1371 : xl_xinfo.xinfo |= XACT_XINFO_HAS_RELFILELOCATORS;
6082 : 1371 : xl_relfilelocators.nrels = nrels;
2087 heikki.linnakangas@i 6083 : 1371 : info |= XLR_SPECIAL_REL_UPDATE;
6084 : : }
6085 : :
1490 andres@anarazel.de 6086 [ + + ]: 9347 : if (ndroppedstats > 0)
6087 : : {
6088 : 1948 : xl_xinfo.xinfo |= XACT_XINFO_HAS_DROPPED_STATS;
6089 : 1948 : xl_dropped_stats.nitems = ndroppedstats;
6090 : : }
6091 : :
4069 6092 [ + + ]: 9347 : if (TransactionIdIsValid(twophase_xid))
6093 : : {
6094 : 48 : xl_xinfo.xinfo |= XACT_XINFO_HAS_TWOPHASE;
6095 : 48 : xl_twophase.xid = twophase_xid;
2960 simon@2ndQuadrant.co 6096 [ - + ]: 48 : Assert(twophase_gid != NULL);
6097 : :
6098 [ + + - + ]: 48 : if (XLogLogicalInfoActive())
6099 : 13 : xl_xinfo.xinfo |= XACT_XINFO_HAS_GID;
6100 : : }
6101 : :
6102 [ + + + + : 9347 : if (TransactionIdIsValid(twophase_xid) && XLogLogicalInfoActive())
- + ]
6103 : : {
6104 : 13 : xl_xinfo.xinfo |= XACT_XINFO_HAS_DBINFO;
6105 : 13 : xl_dbinfo.dbId = MyDatabaseId;
6106 : 13 : xl_dbinfo.tsId = MyDatabaseTableSpace;
6107 : : }
6108 : :
6109 : : /*
6110 : : * Dump transaction origin information. We need this during recovery to
6111 : : * update the replication origin progress.
6112 : : */
97 msawada@postgresql.o 6113 [ + + ]:GNC 9347 : if (replorigin_xact_state.origin != InvalidReplOriginId)
6114 : : {
2960 simon@2ndQuadrant.co 6115 :CBC 28 : xl_xinfo.xinfo |= XACT_XINFO_HAS_ORIGIN;
6116 : :
97 msawada@postgresql.o 6117 :GNC 28 : xl_origin.origin_lsn = replorigin_xact_state.origin_lsn;
6118 : 28 : xl_origin.origin_timestamp = replorigin_xact_state.origin_timestamp;
6119 : : }
6120 : :
4069 andres@anarazel.de 6121 [ + + ]:CBC 9347 : if (xl_xinfo.xinfo != 0)
6122 : 5481 : info |= XLOG_XACT_HAS_INFO;
6123 : :
6124 : : /* Then include all the collected data into the abort record. */
6125 : :
6126 : 9347 : XLogBeginInsert();
6127 : :
448 peter@eisentraut.org 6128 : 9347 : XLogRegisterData(&xlrec, MinSizeOfXactAbort);
6129 : :
4069 andres@anarazel.de 6130 [ + + ]: 9347 : if (xl_xinfo.xinfo != 0)
448 peter@eisentraut.org 6131 : 5481 : XLogRegisterData(&xl_xinfo, sizeof(xl_xinfo));
6132 : :
2960 simon@2ndQuadrant.co 6133 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_DBINFO)
448 peter@eisentraut.org 6134 : 13 : XLogRegisterData(&xl_dbinfo, sizeof(xl_dbinfo));
6135 : :
4069 andres@anarazel.de 6136 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_SUBXACTS)
6137 : : {
448 peter@eisentraut.org 6138 : 108 : XLogRegisterData(&xl_subxacts,
6139 : : MinSizeOfXactSubxacts);
6140 : 108 : XLogRegisterData(subxacts,
6141 : : nsubxacts * sizeof(TransactionId));
6142 : : }
6143 : :
1399 rhaas@postgresql.org 6144 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_RELFILELOCATORS)
6145 : : {
448 peter@eisentraut.org 6146 : 1371 : XLogRegisterData(&xl_relfilelocators,
6147 : : MinSizeOfXactRelfileLocators);
6148 : 1371 : XLogRegisterData(rels,
6149 : : nrels * sizeof(RelFileLocator));
6150 : : }
6151 : :
1490 andres@anarazel.de 6152 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_DROPPED_STATS)
6153 : : {
448 peter@eisentraut.org 6154 : 1948 : XLogRegisterData(&xl_dropped_stats,
6155 : : MinSizeOfXactStatsItems);
6156 : 1948 : XLogRegisterData(droppedstats,
6157 : : ndroppedstats * sizeof(xl_xact_stats_item));
6158 : : }
6159 : :
4069 andres@anarazel.de 6160 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_TWOPHASE)
6161 : : {
448 peter@eisentraut.org 6162 : 48 : XLogRegisterData(&xl_twophase, sizeof(xl_xact_twophase));
2960 simon@2ndQuadrant.co 6163 [ + + ]: 48 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_GID)
609 peter@eisentraut.org 6164 : 13 : XLogRegisterData(twophase_gid, strlen(twophase_gid) + 1);
6165 : : }
6166 : :
2960 simon@2ndQuadrant.co 6167 [ + + ]: 9347 : if (xl_xinfo.xinfo & XACT_XINFO_HAS_ORIGIN)
448 peter@eisentraut.org 6168 : 28 : XLogRegisterData(&xl_origin, sizeof(xl_xact_origin));
6169 : :
6170 : : /* Include the replication origin */
1212 akapila@postgresql.o 6171 : 9347 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
6172 : :
4069 andres@anarazel.de 6173 : 9347 : return XLogInsert(RM_XACT_ID, info);
6174 : : }
6175 : :
6176 : : /*
6177 : : * Before 9.0 this was a fairly short function, but now it performs many
6178 : : * actions for which the order of execution is critical.
6179 : : */
6180 : : static void
6181 : 23874 : xact_redo_commit(xl_xact_parsed_commit *parsed,
6182 : : TransactionId xid,
6183 : : XLogRecPtr lsn,
6184 : : ReplOriginId origin_id)
6185 : : {
6186 : : TransactionId max_xid;
6187 : : TimestampTz commit_time;
6188 : :
3247 alvherre@alvh.no-ip. 6189 [ - + ]: 23874 : Assert(TransactionIdIsValid(xid));
6190 : :
4069 andres@anarazel.de 6191 : 23874 : max_xid = TransactionIdLatest(xid, parsed->nsubxacts, parsed->subxacts);
6192 : :
6193 : : /* Make sure nextXid is beyond any XID mentioned in the record. */
2595 tmunro@postgresql.or 6194 : 23874 : AdvanceNextFullTransactionIdPastXid(max_xid);
6195 : :
3691 andres@anarazel.de 6196 [ - + ]: 23874 : Assert(((parsed->xinfo & XACT_XINFO_HAS_ORIGIN) == 0) ==
6197 : : (origin_id == InvalidReplOriginId));
6198 : :
4024 6199 [ + + ]: 23874 : if (parsed->xinfo & XACT_XINFO_HAS_ORIGIN)
6200 : 20 : commit_time = parsed->origin_timestamp;
6201 : : else
6202 : 23854 : commit_time = parsed->xact_time;
6203 : :
6204 : : /* Set the transaction commit timestamp and metadata */
4069 6205 : 23874 : TransactionTreeSetCommitTsData(xid, parsed->nsubxacts, parsed->subxacts,
6206 : : commit_time, origin_id);
6207 : :
5836 simon@2ndQuadrant.co 6208 [ + + ]: 23874 : if (standbyState == STANDBY_DISABLED)
6209 : : {
6210 : : /*
6211 : : * Mark the transaction committed in pg_xact.
6212 : : */
4069 andres@anarazel.de 6213 : 2227 : TransactionIdCommitTree(xid, parsed->nsubxacts, parsed->subxacts);
6214 : : }
6215 : : else
6216 : : {
6217 : : /*
6218 : : * If a transaction completion record arrives that has as-yet
6219 : : * unobserved subtransactions then this will not have been fully
6220 : : * handled by the call to RecordKnownAssignedTransactionIds() in the
6221 : : * main recovery loop in xlog.c. So we need to do bookkeeping again to
6222 : : * cover that case. This is confusing and it is easy to think this
6223 : : * call is irrelevant, which has happened three times in development
6224 : : * already. Leave it in.
6225 : : */
5981 simon@2ndQuadrant.co 6226 : 21647 : RecordKnownAssignedTransactionIds(max_xid);
6227 : :
6228 : : /*
6229 : : * Mark the transaction committed in pg_xact. We use async commit
6230 : : * protocol during recovery to provide information on database
6231 : : * consistency for when users try to set hint bits. It is important
6232 : : * that we do not set hint bits until the minRecoveryPoint is past
6233 : : * this commit record. This ensures that if we crash we don't see hint
6234 : : * bits set on changes made by transactions that haven't yet
6235 : : * recovered. It's unlikely but it's good to be safe.
6236 : : */
2287 alvherre@alvh.no-ip. 6237 : 21647 : TransactionIdAsyncCommitTree(xid, parsed->nsubxacts, parsed->subxacts, lsn);
6238 : :
6239 : : /*
6240 : : * We must mark clog before we update the ProcArray.
6241 : : */
6242 : 21647 : ExpireTreeKnownAssignedTransactionIds(xid, parsed->nsubxacts, parsed->subxacts, max_xid);
6243 : :
6244 : : /*
6245 : : * Send any cache invalidations attached to the commit. We must
6246 : : * maintain the same order of invalidation then release locks as
6247 : : * occurs in CommitTransaction().
6248 : : */
6249 : 21647 : ProcessCommittedInvalidationMessages(parsed->msgs, parsed->nmsgs,
3240 tgl@sss.pgh.pa.us 6250 : 21647 : XactCompletionRelcacheInitFileInval(parsed->xinfo),
6251 : : parsed->dbId, parsed->tsId);
6252 : :
6253 : : /*
6254 : : * Release locks, if any. We do this for both two phase and normal one
6255 : : * phase transactions. In effect we are ignoring the prepare phase and
6256 : : * just going straight to lock release.
6257 : : */
3331 simon@2ndQuadrant.co 6258 [ + + ]: 21647 : if (parsed->xinfo & XACT_XINFO_HAS_AE_LOCKS)
2880 6259 : 10583 : StandbyReleaseLockTree(xid, parsed->nsubxacts, parsed->subxacts);
6260 : : }
6261 : :
4024 andres@anarazel.de 6262 [ + + ]: 23874 : if (parsed->xinfo & XACT_XINFO_HAS_ORIGIN)
6263 : : {
6264 : : /* recover apply progress */
6265 : 20 : replorigin_advance(origin_id, parsed->origin_lsn, lsn,
6266 : : false /* backward */ , false /* WAL */ );
6267 : : }
6268 : :
6269 : : /* Make sure files supposed to be dropped are dropped */
4069 6270 [ + + ]: 23874 : if (parsed->nrels > 0)
6271 : : {
6272 : : /*
6273 : : * First update minimum recovery point to cover this WAL record. Once
6274 : : * a relation is deleted, there's no going back. The buffer manager
6275 : : * enforces the WAL-first rule for normal updates to relation files,
6276 : : * so that the minimum recovery point is always updated before the
6277 : : * corresponding change in the data file is flushed to disk, but we
6278 : : * have to do the same here since we're bypassing the buffer manager.
6279 : : *
6280 : : * Doing this before deleting the files means that if a deletion fails
6281 : : * for some reason, you cannot start up the system even after restart,
6282 : : * until you fix the underlying situation so that the deletion will
6283 : : * succeed. Alternatively, we could update the minimum recovery point
6284 : : * after deletion, but that would leave a small window where the
6285 : : * WAL-first rule would be violated.
6286 : : */
4894 heikki.linnakangas@i 6287 : 2283 : XLogFlush(lsn);
6288 : :
6289 : : /* Make sure files supposed to be dropped are dropped */
1399 rhaas@postgresql.org 6290 : 2283 : DropRelationFiles(parsed->xlocators, parsed->nrels, true);
6291 : : }
6292 : :
1490 andres@anarazel.de 6293 [ + + ]: 23874 : if (parsed->nstats > 0)
6294 : : {
6295 : : /* see equivalent call for relations above */
6296 : 2959 : XLogFlush(lsn);
6297 : :
6298 : 2959 : pgstat_execute_transactional_drops(parsed->nstats, parsed->stats, true);
6299 : : }
6300 : :
6301 : : /*
6302 : : * We issue an XLogFlush() for the same reason we emit ForceSyncCommit()
6303 : : * in normal operation. For example, in CREATE DATABASE, we copy all files
6304 : : * from the template database, and then commit the transaction. If we
6305 : : * crash after all the files have been copied but before the commit, you
6306 : : * have files in the data directory without an entry in pg_database. To
6307 : : * minimize the window for that, we use ForceSyncCommit() to rush the
6308 : : * commit record to disk as quick as possible. We have the same window
6309 : : * during recovery, and forcing an XLogFlush() (which updates
6310 : : * minRecoveryPoint during recovery) helps to reduce that problem window,
6311 : : * for any user that requested ForceSyncCommit().
6312 : : */
4069 6313 [ + + ]: 23874 : if (XactCompletionForceSyncCommit(parsed->xinfo))
5981 simon@2ndQuadrant.co 6314 : 49 : XLogFlush(lsn);
6315 : :
6316 : : /*
6317 : : * If asked by the primary (because someone is waiting for a synchronous
6318 : : * commit = remote_apply), we will need to ask walreceiver to send a reply
6319 : : * immediately.
6320 : : */
3689 rhaas@postgresql.org 6321 [ + + ]: 23874 : if (XactCompletionApplyFeedback(parsed->xinfo))
6322 : 2 : XLogRequestWalReceiverReply();
5425 simon@2ndQuadrant.co 6323 : 23874 : }
6324 : :
6325 : : /*
6326 : : * Be careful with the order of execution, as with xact_redo_commit().
6327 : : * The two functions are similar but differ in key places.
6328 : : *
6329 : : * Note also that an abort can be for a subtransaction and its children,
6330 : : * not just for a top level abort. That means we have to consider
6331 : : * topxid != xid, whereas in commit we would find topxid == xid always
6332 : : * because subtransaction commit is never WAL logged.
6333 : : */
6334 : : static void
1884 akapila@postgresql.o 6335 : 2003 : xact_redo_abort(xl_xact_parsed_abort *parsed, TransactionId xid,
6336 : : XLogRecPtr lsn, ReplOriginId origin_id)
6337 : : {
6338 : : TransactionId max_xid;
6339 : :
3247 alvherre@alvh.no-ip. 6340 [ - + ]: 2003 : Assert(TransactionIdIsValid(xid));
6341 : :
6342 : : /* Make sure nextXid is beyond any XID mentioned in the record. */
4069 andres@anarazel.de 6343 : 2003 : max_xid = TransactionIdLatest(xid,
6344 : : parsed->nsubxacts,
6345 : 2003 : parsed->subxacts);
2595 tmunro@postgresql.or 6346 : 2003 : AdvanceNextFullTransactionIdPastXid(max_xid);
6347 : :
5836 simon@2ndQuadrant.co 6348 [ + + ]: 2003 : if (standbyState == STANDBY_DISABLED)
6349 : : {
6350 : : /* Mark the transaction aborted in pg_xact, no need for async stuff */
4069 andres@anarazel.de 6351 : 20 : TransactionIdAbortTree(xid, parsed->nsubxacts, parsed->subxacts);
6352 : : }
6353 : : else
6354 : : {
6355 : : /*
6356 : : * If a transaction completion record arrives that has as-yet
6357 : : * unobserved subtransactions then this will not have been fully
6358 : : * handled by the call to RecordKnownAssignedTransactionIds() in the
6359 : : * main recovery loop in xlog.c. So we need to do bookkeeping again to
6360 : : * cover that case. This is confusing and it is easy to think this
6361 : : * call is irrelevant, which has happened three times in development
6362 : : * already. Leave it in.
6363 : : */
5981 simon@2ndQuadrant.co 6364 : 1983 : RecordKnownAssignedTransactionIds(max_xid);
6365 : :
6366 : : /* Mark the transaction aborted in pg_xact, no need for async stuff */
4069 andres@anarazel.de 6367 : 1983 : TransactionIdAbortTree(xid, parsed->nsubxacts, parsed->subxacts);
6368 : :
6369 : : /*
6370 : : * We must update the ProcArray after we have marked clog.
6371 : : */
2287 alvherre@alvh.no-ip. 6372 : 1983 : ExpireTreeKnownAssignedTransactionIds(xid, parsed->nsubxacts, parsed->subxacts, max_xid);
6373 : :
6374 : : /*
6375 : : * There are no invalidation messages to send or undo.
6376 : : */
6377 : :
6378 : : /*
6379 : : * Release locks, if any. There are no invalidations to send.
6380 : : */
3331 simon@2ndQuadrant.co 6381 [ + + ]: 1983 : if (parsed->xinfo & XACT_XINFO_HAS_AE_LOCKS)
6382 : 1259 : StandbyReleaseLockTree(xid, parsed->nsubxacts, parsed->subxacts);
6383 : : }
6384 : :
1884 akapila@postgresql.o 6385 [ + + ]: 2003 : if (parsed->xinfo & XACT_XINFO_HAS_ORIGIN)
6386 : : {
6387 : : /* recover apply progress */
6388 : 5 : replorigin_advance(origin_id, parsed->origin_lsn, lsn,
6389 : : false /* backward */ , false /* WAL */ );
6390 : : }
6391 : :
6392 : : /* Make sure files supposed to be dropped are dropped */
1741 fujii@postgresql.org 6393 [ + + ]: 2003 : if (parsed->nrels > 0)
6394 : : {
6395 : : /*
6396 : : * See comments about update of minimum recovery point on truncation,
6397 : : * in xact_redo_commit().
6398 : : */
6399 : 334 : XLogFlush(lsn);
6400 : :
1399 rhaas@postgresql.org 6401 : 334 : DropRelationFiles(parsed->xlocators, parsed->nrels, true);
6402 : : }
6403 : :
1490 andres@anarazel.de 6404 [ + + ]: 2003 : if (parsed->nstats > 0)
6405 : : {
6406 : : /* see equivalent call for relations above */
6407 : 460 : XLogFlush(lsn);
6408 : :
6409 : 460 : pgstat_execute_transactional_drops(parsed->nstats, parsed->stats, true);
6410 : : }
7627 tgl@sss.pgh.pa.us 6411 : 2003 : }
6412 : :
6413 : : void
4184 heikki.linnakangas@i 6414 : 26232 : xact_redo(XLogReaderState *record)
6415 : : {
4069 andres@anarazel.de 6416 : 26232 : uint8 info = XLogRecGetInfo(record) & XLOG_XACT_OPMASK;
6417 : :
6418 : : /* Backup blocks are not used in xact records */
4184 heikki.linnakangas@i 6419 [ - + ]: 26232 : Assert(!XLogRecHasAnyBlockRefs(record));
6420 : :
3247 alvherre@alvh.no-ip. 6421 [ + + ]: 26232 : if (info == XLOG_XACT_COMMIT)
6422 : : {
8119 tgl@sss.pgh.pa.us 6423 : 23828 : xl_xact_commit *xlrec = (xl_xact_commit *) XLogRecGetData(record);
6424 : : xl_xact_parsed_commit parsed;
6425 : :
3247 alvherre@alvh.no-ip. 6426 : 23828 : ParseCommitRecord(XLogRecGetInfo(record), xlrec, &parsed);
6427 : 23828 : xact_redo_commit(&parsed, XLogRecGetXid(record),
6428 : 23828 : record->EndRecPtr, XLogRecGetOrigin(record));
6429 : : }
6430 [ + + ]: 2404 : else if (info == XLOG_XACT_COMMIT_PREPARED)
6431 : : {
6432 : 46 : xl_xact_commit *xlrec = (xl_xact_commit *) XLogRecGetData(record);
6433 : : xl_xact_parsed_commit parsed;
6434 : :
6435 : 46 : ParseCommitRecord(XLogRecGetInfo(record), xlrec, &parsed);
6436 : 46 : xact_redo_commit(&parsed, parsed.twophase_xid,
6437 : 46 : record->EndRecPtr, XLogRecGetOrigin(record));
6438 : :
6439 : : /* Delete TwoPhaseState gxact entry and/or 2PC file. */
6440 : 46 : LWLockAcquire(TwoPhaseStateLock, LW_EXCLUSIVE);
6441 : 46 : PrepareRedoRemove(parsed.twophase_xid, false);
6442 : 46 : LWLockRelease(TwoPhaseStateLock);
6443 : : }
6444 [ + + ]: 2358 : else if (info == XLOG_XACT_ABORT)
6445 : : {
7627 tgl@sss.pgh.pa.us 6446 : 1978 : xl_xact_abort *xlrec = (xl_xact_abort *) XLogRecGetData(record);
6447 : : xl_xact_parsed_abort parsed;
6448 : :
3247 alvherre@alvh.no-ip. 6449 : 1978 : ParseAbortRecord(XLogRecGetInfo(record), xlrec, &parsed);
1884 akapila@postgresql.o 6450 : 1978 : xact_redo_abort(&parsed, XLogRecGetXid(record),
6451 : 1978 : record->EndRecPtr, XLogRecGetOrigin(record));
6452 : : }
3247 alvherre@alvh.no-ip. 6453 [ + + ]: 380 : else if (info == XLOG_XACT_ABORT_PREPARED)
6454 : : {
6455 : 25 : xl_xact_abort *xlrec = (xl_xact_abort *) XLogRecGetData(record);
6456 : : xl_xact_parsed_abort parsed;
6457 : :
6458 : 25 : ParseAbortRecord(XLogRecGetInfo(record), xlrec, &parsed);
1884 akapila@postgresql.o 6459 : 25 : xact_redo_abort(&parsed, parsed.twophase_xid,
6460 : 25 : record->EndRecPtr, XLogRecGetOrigin(record));
6461 : :
6462 : : /* Delete TwoPhaseState gxact entry and/or 2PC file. */
3247 alvherre@alvh.no-ip. 6463 : 25 : LWLockAcquire(TwoPhaseStateLock, LW_EXCLUSIVE);
6464 : 25 : PrepareRedoRemove(parsed.twophase_xid, false);
6465 : 25 : LWLockRelease(TwoPhaseStateLock);
6466 : : }
7627 tgl@sss.pgh.pa.us 6467 [ + + ]: 355 : else if (info == XLOG_XACT_PREPARE)
6468 : : {
6469 : : /*
6470 : : * Store xid and start/end pointers of the WAL record in TwoPhaseState
6471 : : * gxact entry.
6472 : : */
3247 alvherre@alvh.no-ip. 6473 : 81 : LWLockAcquire(TwoPhaseStateLock, LW_EXCLUSIVE);
302 michael@paquier.xyz 6474 :GNC 81 : PrepareRedoAdd(InvalidFullTransactionId,
6475 : 81 : XLogRecGetData(record),
6476 : : record->ReadRecPtr,
6477 : : record->EndRecPtr,
2960 simon@2ndQuadrant.co 6478 :CBC 81 : XLogRecGetOrigin(record));
3247 alvherre@alvh.no-ip. 6479 : 81 : LWLockRelease(TwoPhaseStateLock);
6480 : : }
5981 simon@2ndQuadrant.co 6481 [ + + ]: 274 : else if (info == XLOG_XACT_ASSIGNMENT)
6482 : : {
6483 : 21 : xl_xact_assignment *xlrec = (xl_xact_assignment *) XLogRecGetData(record);
6484 : :
5836 6485 [ + - ]: 21 : if (standbyState >= STANDBY_INITIALIZED)
5981 6486 : 21 : ProcArrayApplyXidAssignment(xlrec->xtop,
6487 : 21 : xlrec->nsubxacts, xlrec->xsub);
6488 : : }
2112 akapila@postgresql.o 6489 [ - + ]: 253 : else if (info == XLOG_XACT_INVALIDATIONS)
6490 : : {
6491 : : /*
6492 : : * XXX we do ignore this for now, what matters are invalidations
6493 : : * written into the commit record.
6494 : : */
6495 : : }
6496 : : else
7627 tgl@sss.pgh.pa.us 6497 [ # # ]:UBC 0 : elog(PANIC, "xact_redo: unknown op code %u", info);
7627 tgl@sss.pgh.pa.us 6498 :CBC 26232 : }
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