Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * heapam.h
4 : : * POSTGRES heap access method definitions.
5 : : *
6 : : *
7 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
8 : : * Portions Copyright (c) 1994, Regents of the University of California
9 : : *
10 : : * src/include/access/heapam.h
11 : : *
12 : : *-------------------------------------------------------------------------
13 : : */
14 : : #ifndef HEAPAM_H
15 : : #define HEAPAM_H
16 : :
17 : : #include "access/heapam_xlog.h"
18 : : #include "access/relation.h" /* for backward compatibility */
19 : : #include "access/relscan.h"
20 : : #include "access/sdir.h"
21 : : #include "access/skey.h"
22 : : #include "access/table.h" /* for backward compatibility */
23 : : #include "access/tableam.h"
24 : : #include "commands/vacuum.h"
25 : : #include "nodes/lockoptions.h"
26 : : #include "nodes/primnodes.h"
27 : : #include "storage/bufpage.h"
28 : : #include "storage/dsm.h"
29 : : #include "storage/lockdefs.h"
30 : : #include "storage/read_stream.h"
31 : : #include "storage/shm_toc.h"
32 : : #include "utils/relcache.h"
33 : : #include "utils/snapshot.h"
34 : :
35 : :
36 : : /* "options" flag bits for heap_insert */
37 : : #define HEAP_INSERT_SKIP_FSM TABLE_INSERT_SKIP_FSM
38 : : #define HEAP_INSERT_FROZEN TABLE_INSERT_FROZEN
39 : : #define HEAP_INSERT_NO_LOGICAL TABLE_INSERT_NO_LOGICAL
40 : : #define HEAP_INSERT_SPECULATIVE 0x0010
41 : :
42 : : /* "options" flag bits for heap_page_prune_and_freeze */
43 : : #define HEAP_PAGE_PRUNE_MARK_UNUSED_NOW (1 << 0)
44 : : #define HEAP_PAGE_PRUNE_FREEZE (1 << 1)
45 : :
46 : : typedef struct BulkInsertStateData *BulkInsertState;
47 : : typedef struct GlobalVisState GlobalVisState;
48 : : typedef struct TupleTableSlot TupleTableSlot;
49 : : struct VacuumCutoffs;
50 : :
51 : : #define MaxLockTupleMode LockTupleExclusive
52 : :
53 : : /*
54 : : * Descriptor for heap table scans.
55 : : */
56 : : typedef struct HeapScanDescData
57 : : {
58 : : TableScanDescData rs_base; /* AM independent part of the descriptor */
59 : :
60 : : /* state set up at initscan time */
61 : : BlockNumber rs_nblocks; /* total number of blocks in rel */
62 : : BlockNumber rs_startblock; /* block # to start at */
63 : : BlockNumber rs_numblocks; /* max number of blocks to scan */
64 : : /* rs_numblocks is usually InvalidBlockNumber, meaning "scan whole rel" */
65 : :
66 : : /* scan current state */
67 : : bool rs_inited; /* false = scan not init'd yet */
68 : : OffsetNumber rs_coffset; /* current offset # in non-page-at-a-time mode */
69 : : BlockNumber rs_cblock; /* current block # in scan, if any */
70 : : Buffer rs_cbuf; /* current buffer in scan, if any */
71 : : /* NB: if rs_cbuf is not InvalidBuffer, we hold a pin on that buffer */
72 : :
73 : : BufferAccessStrategy rs_strategy; /* access strategy for reads */
74 : :
75 : : HeapTupleData rs_ctup; /* current tuple in scan, if any */
76 : :
77 : : /* For scans that stream reads */
78 : : ReadStream *rs_read_stream;
79 : :
80 : : /*
81 : : * For sequential scans and TID range scans to stream reads. The read
82 : : * stream is allocated at the beginning of the scan and reset on rescan or
83 : : * when the scan direction changes. The scan direction is saved each time
84 : : * a new page is requested. If the scan direction changes from one page to
85 : : * the next, the read stream releases all previously pinned buffers and
86 : : * resets the prefetch block.
87 : : */
88 : : ScanDirection rs_dir;
89 : : BlockNumber rs_prefetch_block;
90 : :
91 : : /*
92 : : * For parallel scans to store page allocation data. NULL when not
93 : : * performing a parallel scan.
94 : : */
95 : : ParallelBlockTableScanWorkerData *rs_parallelworkerdata;
96 : :
97 : : /* these fields only used in page-at-a-time mode and for bitmap scans */
98 : : uint32 rs_cindex; /* current tuple's index in vistuples */
99 : : uint32 rs_ntuples; /* number of visible tuples on page */
100 : : OffsetNumber rs_vistuples[MaxHeapTuplesPerPage]; /* their offsets */
101 : : } HeapScanDescData;
102 : : typedef struct HeapScanDescData *HeapScanDesc;
103 : :
104 : : typedef struct BitmapHeapScanDescData
105 : : {
106 : : HeapScanDescData rs_heap_base;
107 : :
108 : : /* Holds no data */
109 : : } BitmapHeapScanDescData;
110 : : typedef struct BitmapHeapScanDescData *BitmapHeapScanDesc;
111 : :
112 : : /*
113 : : * Descriptor for fetches from heap via an index.
114 : : */
115 : : typedef struct IndexFetchHeapData
116 : : {
117 : : IndexFetchTableData xs_base; /* AM independent part of the descriptor */
118 : :
119 : : Buffer xs_cbuf; /* current heap buffer in scan, if any */
120 : : /* NB: if xs_cbuf is not InvalidBuffer, we hold a pin on that buffer */
121 : : } IndexFetchHeapData;
122 : :
123 : : /* Result codes for HeapTupleSatisfiesVacuum */
124 : : typedef enum
125 : : {
126 : : HEAPTUPLE_DEAD, /* tuple is dead and deletable */
127 : : HEAPTUPLE_LIVE, /* tuple is live (committed, no deleter) */
128 : : HEAPTUPLE_RECENTLY_DEAD, /* tuple is dead, but not deletable yet */
129 : : HEAPTUPLE_INSERT_IN_PROGRESS, /* inserting xact is still in progress */
130 : : HEAPTUPLE_DELETE_IN_PROGRESS, /* deleting xact is still in progress */
131 : : } HTSV_Result;
132 : :
133 : : /*
134 : : * heap_prepare_freeze_tuple may request that heap_freeze_execute_prepared
135 : : * check any tuple's to-be-frozen xmin and/or xmax status using pg_xact
136 : : */
137 : : #define HEAP_FREEZE_CHECK_XMIN_COMMITTED 0x01
138 : : #define HEAP_FREEZE_CHECK_XMAX_ABORTED 0x02
139 : :
140 : : /* heap_prepare_freeze_tuple state describing how to freeze a tuple */
141 : : typedef struct HeapTupleFreeze
142 : : {
143 : : /* Fields describing how to process tuple */
144 : : TransactionId xmax;
145 : : uint16 t_infomask2;
146 : : uint16 t_infomask;
147 : : uint8 frzflags;
148 : :
149 : : /* xmin/xmax check flags */
150 : : uint8 checkflags;
151 : : /* Page offset number for tuple */
152 : : OffsetNumber offset;
153 : : } HeapTupleFreeze;
154 : :
155 : : /*
156 : : * State used by VACUUM to track the details of freezing all eligible tuples
157 : : * on a given heap page.
158 : : *
159 : : * VACUUM prepares freeze plans for each page via heap_prepare_freeze_tuple
160 : : * calls (every tuple with storage gets its own call). This page-level freeze
161 : : * state is updated across each call, which ultimately determines whether or
162 : : * not freezing the page is required.
163 : : *
164 : : * Aside from the basic question of whether or not freezing will go ahead, the
165 : : * state also tracks the oldest extant XID/MXID in the table as a whole, for
166 : : * the purposes of advancing relfrozenxid/relminmxid values in pg_class later
167 : : * on. Each heap_prepare_freeze_tuple call pushes NewRelfrozenXid and/or
168 : : * NewRelminMxid back as required to avoid unsafe final pg_class values. Any
169 : : * and all unfrozen XIDs or MXIDs that remain after VACUUM finishes _must_
170 : : * have values >= the final relfrozenxid/relminmxid values in pg_class. This
171 : : * includes XIDs that remain as MultiXact members from any tuple's xmax.
172 : : *
173 : : * When 'freeze_required' flag isn't set after all tuples are examined, the
174 : : * final choice on freezing is made by vacuumlazy.c. It can decide to trigger
175 : : * freezing based on whatever criteria it deems appropriate. However, it is
176 : : * recommended that vacuumlazy.c avoid early freezing when freezing does not
177 : : * enable setting the target page all-frozen in the visibility map afterwards.
178 : : */
179 : : typedef struct HeapPageFreeze
180 : : {
181 : : /* Is heap_prepare_freeze_tuple caller required to freeze page? */
182 : : bool freeze_required;
183 : :
184 : : /*
185 : : * "Freeze" NewRelfrozenXid/NewRelminMxid trackers.
186 : : *
187 : : * Trackers used when heap_freeze_execute_prepared freezes, or when there
188 : : * are zero freeze plans for a page. It is always valid for vacuumlazy.c
189 : : * to freeze any page, by definition. This even includes pages that have
190 : : * no tuples with storage to consider in the first place. That way the
191 : : * 'totally_frozen' results from heap_prepare_freeze_tuple can always be
192 : : * used in the same way, even when no freeze plans need to be executed to
193 : : * "freeze the page". Only the "freeze" path needs to consider the need
194 : : * to set pages all-frozen in the visibility map under this scheme.
195 : : *
196 : : * When we freeze a page, we generally freeze all XIDs < OldestXmin, only
197 : : * leaving behind XIDs that are ineligible for freezing, if any. And so
198 : : * you might wonder why these trackers are necessary at all; why should
199 : : * _any_ page that VACUUM freezes _ever_ be left with XIDs/MXIDs that
200 : : * ratchet back the top-level NewRelfrozenXid/NewRelminMxid trackers?
201 : : *
202 : : * It is useful to use a definition of "freeze the page" that does not
203 : : * overspecify how MultiXacts are affected. heap_prepare_freeze_tuple
204 : : * generally prefers to remove Multis eagerly, but lazy processing is used
205 : : * in cases where laziness allows VACUUM to avoid allocating a new Multi.
206 : : * The "freeze the page" trackers enable this flexibility.
207 : : */
208 : : TransactionId FreezePageRelfrozenXid;
209 : : MultiXactId FreezePageRelminMxid;
210 : :
211 : : /*
212 : : * Newest XID that this page's freeze actions will remove from tuple
213 : : * visibility metadata (currently xmin and/or xvac). It is used to derive
214 : : * the snapshot conflict horizon for a WAL record that freezes tuples. On
215 : : * a standby, we must not replay that change while any snapshot could
216 : : * still treat that XID as running.
217 : : *
218 : : * It's only used if we execute freeze plans for this page, so there is no
219 : : * corresponding "no freeze" tracker.
220 : : */
221 : : TransactionId FreezePageConflictXid;
222 : :
223 : : /*
224 : : * "No freeze" NewRelfrozenXid/NewRelminMxid trackers.
225 : : *
226 : : * These trackers are maintained in the same way as the trackers used when
227 : : * VACUUM scans a page that isn't cleanup locked. Both code paths are
228 : : * based on the same general idea (do less work for this page during the
229 : : * ongoing VACUUM, at the cost of having to accept older final values).
230 : : */
231 : : TransactionId NoFreezePageRelfrozenXid;
232 : : MultiXactId NoFreezePageRelminMxid;
233 : :
234 : : } HeapPageFreeze;
235 : :
236 : :
237 : : /* 'reason' codes for heap_page_prune_and_freeze() */
238 : : typedef enum
239 : : {
240 : : PRUNE_ON_ACCESS, /* on-access pruning */
241 : : PRUNE_VACUUM_SCAN, /* VACUUM 1st heap pass */
242 : : PRUNE_VACUUM_CLEANUP, /* VACUUM 2nd heap pass */
243 : : } PruneReason;
244 : :
245 : : /*
246 : : * Input parameters to heap_page_prune_and_freeze()
247 : : */
248 : : typedef struct PruneFreezeParams
249 : : {
250 : : Relation relation; /* relation containing buffer to be pruned */
251 : : Buffer buffer; /* buffer to be pruned */
252 : :
253 : : /*
254 : : * The reason pruning was performed. It is used to set the WAL record
255 : : * opcode which is used for debugging and analysis purposes.
256 : : */
257 : : PruneReason reason;
258 : :
259 : : /*
260 : : * Contains flag bits:
261 : : *
262 : : * HEAP_PAGE_PRUNE_MARK_UNUSED_NOW indicates that dead items can be set
263 : : * LP_UNUSED during pruning.
264 : : *
265 : : * HEAP_PAGE_PRUNE_FREEZE indicates that we will also freeze tuples, and
266 : : * will return 'all_visible', 'all_frozen' flags to the caller.
267 : : */
268 : : int options;
269 : :
270 : : /*
271 : : * vistest is used to distinguish whether tuples are DEAD or RECENTLY_DEAD
272 : : * (see heap_prune_satisfies_vacuum).
273 : : */
274 : : GlobalVisState *vistest;
275 : :
276 : : /*
277 : : * Contains the cutoffs used for freezing. They are required if the
278 : : * HEAP_PAGE_PRUNE_FREEZE option is set. cutoffs->OldestXmin is also used
279 : : * to determine if dead tuples are HEAPTUPLE_RECENTLY_DEAD or
280 : : * HEAPTUPLE_DEAD. Currently only vacuum passes in cutoffs. Vacuum
281 : : * calculates them once, at the beginning of vacuuming the relation.
282 : : */
283 : : struct VacuumCutoffs *cutoffs;
284 : : } PruneFreezeParams;
285 : :
286 : : /*
287 : : * Per-page state returned by heap_page_prune_and_freeze()
288 : : */
289 : : typedef struct PruneFreezeResult
290 : : {
291 : : int ndeleted; /* Number of tuples deleted from the page */
292 : : int nnewlpdead; /* Number of newly LP_DEAD items */
293 : : int nfrozen; /* Number of tuples we froze */
294 : :
295 : : /* Number of live and recently dead tuples on the page, after pruning */
296 : : int live_tuples;
297 : : int recently_dead_tuples;
298 : :
299 : : /*
300 : : * set_all_visible and set_all_frozen indicate if the all-visible and
301 : : * all-frozen bits in the visibility map should be set for this page after
302 : : * pruning.
303 : : *
304 : : * vm_conflict_horizon is the newest xmin of live tuples on the page. The
305 : : * caller can use it as the conflict horizon when setting the VM bits. It
306 : : * is only valid if we froze some tuples (nfrozen > 0), and set_all_frozen
307 : : * is true.
308 : : *
309 : : * These are only set if the HEAP_PAGE_PRUNE_FREEZE option is set.
310 : : */
311 : : bool set_all_visible;
312 : : bool set_all_frozen;
313 : : TransactionId vm_conflict_horizon;
314 : :
315 : : /*
316 : : * Whether or not the page makes rel truncation unsafe. This is set to
317 : : * 'true', even if the page contains LP_DEAD items. VACUUM will remove
318 : : * them before attempting to truncate.
319 : : */
320 : : bool hastup;
321 : :
322 : : /*
323 : : * LP_DEAD items on the page after pruning. Includes existing LP_DEAD
324 : : * items.
325 : : */
326 : : int lpdead_items;
327 : : OffsetNumber deadoffsets[MaxHeapTuplesPerPage];
328 : : } PruneFreezeResult;
329 : :
330 : :
331 : : /* ----------------
332 : : * function prototypes for heap access method
333 : : *
334 : : * heap_create, heap_create_with_catalog, and heap_drop_with_catalog
335 : : * are declared in catalog/heap.h
336 : : * ----------------
337 : : */
338 : :
339 : :
340 : : extern TableScanDesc heap_beginscan(Relation relation, Snapshot snapshot,
341 : : int nkeys, ScanKey key,
342 : : ParallelTableScanDesc parallel_scan,
343 : : uint32 flags);
344 : : extern void heap_setscanlimits(TableScanDesc sscan, BlockNumber startBlk,
345 : : BlockNumber numBlks);
346 : : extern void heap_prepare_pagescan(TableScanDesc sscan);
347 : : extern void heap_rescan(TableScanDesc sscan, ScanKey key, bool set_params,
348 : : bool allow_strat, bool allow_sync, bool allow_pagemode);
349 : : extern void heap_endscan(TableScanDesc sscan);
350 : : extern HeapTuple heap_getnext(TableScanDesc sscan, ScanDirection direction);
351 : : extern bool heap_getnextslot(TableScanDesc sscan,
352 : : ScanDirection direction, TupleTableSlot *slot);
353 : : extern void heap_set_tidrange(TableScanDesc sscan, ItemPointer mintid,
354 : : ItemPointer maxtid);
355 : : extern bool heap_getnextslot_tidrange(TableScanDesc sscan,
356 : : ScanDirection direction,
357 : : TupleTableSlot *slot);
358 : : extern bool heap_fetch(Relation relation, Snapshot snapshot,
359 : : HeapTuple tuple, Buffer *userbuf, bool keep_buf);
360 : : extern bool heap_hot_search_buffer(ItemPointer tid, Relation relation,
361 : : Buffer buffer, Snapshot snapshot, HeapTuple heapTuple,
362 : : bool *all_dead, bool first_call);
363 : :
364 : : extern void heap_get_latest_tid(TableScanDesc sscan, ItemPointer tid);
365 : :
366 : : extern BulkInsertState GetBulkInsertState(void);
367 : : extern void FreeBulkInsertState(BulkInsertState);
368 : : extern void ReleaseBulkInsertStatePin(BulkInsertState bistate);
369 : :
370 : : extern void heap_insert(Relation relation, HeapTuple tup, CommandId cid,
371 : : int options, BulkInsertState bistate);
372 : : extern void heap_multi_insert(Relation relation, TupleTableSlot **slots,
373 : : int ntuples, CommandId cid, int options,
374 : : BulkInsertState bistate);
375 : : extern TM_Result heap_delete(Relation relation, const ItemPointerData *tid,
376 : : CommandId cid, Snapshot crosscheck, bool wait,
377 : : TM_FailureData *tmfd, bool changingPart);
378 : : extern void heap_finish_speculative(Relation relation, const ItemPointerData *tid);
379 : : extern void heap_abort_speculative(Relation relation, const ItemPointerData *tid);
380 : : extern TM_Result heap_update(Relation relation, const ItemPointerData *otid,
381 : : HeapTuple newtup,
382 : : CommandId cid, Snapshot crosscheck, bool wait,
383 : : TM_FailureData *tmfd, LockTupleMode *lockmode,
384 : : TU_UpdateIndexes *update_indexes);
385 : : extern TM_Result heap_lock_tuple(Relation relation, HeapTuple tuple,
386 : : CommandId cid, LockTupleMode mode, LockWaitPolicy wait_policy,
387 : : bool follow_updates,
388 : : Buffer *buffer, TM_FailureData *tmfd);
389 : :
390 : : extern bool heap_inplace_lock(Relation relation,
391 : : HeapTuple oldtup_ptr, Buffer buffer,
392 : : void (*release_callback) (void *), void *arg);
393 : : extern void heap_inplace_update_and_unlock(Relation relation,
394 : : HeapTuple oldtup, HeapTuple tuple,
395 : : Buffer buffer);
396 : : extern void heap_inplace_unlock(Relation relation,
397 : : HeapTuple oldtup, Buffer buffer);
398 : : extern bool heap_prepare_freeze_tuple(HeapTupleHeader tuple,
399 : : const struct VacuumCutoffs *cutoffs,
400 : : HeapPageFreeze *pagefrz,
401 : : HeapTupleFreeze *frz, bool *totally_frozen);
402 : :
403 : : extern void heap_pre_freeze_checks(Buffer buffer,
404 : : HeapTupleFreeze *tuples, int ntuples);
405 : : extern void heap_freeze_prepared_tuples(Buffer buffer,
406 : : HeapTupleFreeze *tuples, int ntuples);
407 : : extern bool heap_freeze_tuple(HeapTupleHeader tuple,
408 : : TransactionId relfrozenxid, TransactionId relminmxid,
409 : : TransactionId FreezeLimit, TransactionId MultiXactCutoff);
410 : : extern bool heap_tuple_should_freeze(HeapTupleHeader tuple,
411 : : const struct VacuumCutoffs *cutoffs,
412 : : TransactionId *NoFreezePageRelfrozenXid,
413 : : MultiXactId *NoFreezePageRelminMxid);
414 : : extern bool heap_tuple_needs_eventual_freeze(HeapTupleHeader tuple);
415 : :
416 : : extern void simple_heap_insert(Relation relation, HeapTuple tup);
417 : : extern void simple_heap_delete(Relation relation, const ItemPointerData *tid);
418 : : extern void simple_heap_update(Relation relation, const ItemPointerData *otid,
419 : : HeapTuple tup, TU_UpdateIndexes *update_indexes);
420 : :
421 : : extern TransactionId heap_index_delete_tuples(Relation rel,
422 : : TM_IndexDeleteOp *delstate);
423 : :
424 : : /* in heap/pruneheap.c */
425 : : extern void heap_page_prune_opt(Relation relation, Buffer buffer);
426 : : extern void heap_page_prune_and_freeze(PruneFreezeParams *params,
427 : : PruneFreezeResult *presult,
428 : : OffsetNumber *off_loc,
429 : : TransactionId *new_relfrozen_xid,
430 : : MultiXactId *new_relmin_mxid);
431 : : extern void heap_page_prune_execute(Buffer buffer, bool lp_truncate_only,
432 : : OffsetNumber *redirected, int nredirected,
433 : : OffsetNumber *nowdead, int ndead,
434 : : OffsetNumber *nowunused, int nunused);
435 : : extern void heap_get_root_tuples(Page page, OffsetNumber *root_offsets);
436 : : extern void log_heap_prune_and_freeze(Relation relation, Buffer buffer,
437 : : Buffer vmbuffer, uint8 vmflags,
438 : : TransactionId conflict_xid,
439 : : bool cleanup_lock,
440 : : PruneReason reason,
441 : : HeapTupleFreeze *frozen, int nfrozen,
442 : : OffsetNumber *redirected, int nredirected,
443 : : OffsetNumber *dead, int ndead,
444 : : OffsetNumber *unused, int nunused);
445 : :
446 : : /* in heap/vacuumlazy.c */
447 : : extern void heap_vacuum_rel(Relation rel,
448 : : const VacuumParams params, BufferAccessStrategy bstrategy);
449 : :
450 : : /* in heap/heapam_visibility.c */
451 : : extern bool HeapTupleSatisfiesVisibility(HeapTuple htup, Snapshot snapshot,
452 : : Buffer buffer);
453 : : extern TM_Result HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
454 : : Buffer buffer);
455 : : extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple htup, TransactionId OldestXmin,
456 : : Buffer buffer);
457 : : extern HTSV_Result HeapTupleSatisfiesVacuumHorizon(HeapTuple htup, Buffer buffer,
458 : : TransactionId *dead_after);
459 : : extern void HeapTupleSetHintBits(HeapTupleHeader tuple, Buffer buffer,
460 : : uint16 infomask, TransactionId xid);
461 : : extern bool HeapTupleHeaderIsOnlyLocked(HeapTupleHeader tuple);
462 : : extern bool HeapTupleIsSurelyDead(HeapTuple htup,
463 : : GlobalVisState *vistest);
464 : :
465 : : /*
466 : : * Some of the input/output to/from HeapTupleSatisfiesMVCCBatch() is passed
467 : : * via this struct, as otherwise the increased number of arguments to
468 : : * HeapTupleSatisfiesMVCCBatch() leads to on-stack argument passing on x86-64,
469 : : * which causes a small regression.
470 : : */
471 : : typedef struct BatchMVCCState
472 : : {
473 : : HeapTupleData tuples[MaxHeapTuplesPerPage];
474 : : bool visible[MaxHeapTuplesPerPage];
475 : : } BatchMVCCState;
476 : :
477 : : extern int HeapTupleSatisfiesMVCCBatch(Snapshot snapshot, Buffer buffer,
478 : : int ntups,
479 : : BatchMVCCState *batchmvcc,
480 : : OffsetNumber *vistuples_dense);
481 : :
482 : : /*
483 : : * To avoid leaking too much knowledge about reorderbuffer implementation
484 : : * details this is implemented in reorderbuffer.c not heapam_visibility.c
485 : : */
486 : : struct HTAB;
487 : : extern bool ResolveCminCmaxDuringDecoding(struct HTAB *tuplecid_data,
488 : : Snapshot snapshot,
489 : : HeapTuple htup,
490 : : Buffer buffer,
491 : : CommandId *cmin, CommandId *cmax);
492 : : extern void HeapCheckForSerializableConflictOut(bool visible, Relation relation, HeapTuple tuple,
493 : : Buffer buffer, Snapshot snapshot);
494 : :
495 : : /*
496 : : * heap_execute_freeze_tuple
497 : : * Execute the prepared freezing of a tuple with caller's freeze plan.
498 : : *
499 : : * Caller is responsible for ensuring that no other backend can access the
500 : : * storage underlying this tuple, either by holding an exclusive lock on the
501 : : * buffer containing it (which is what lazy VACUUM does), or by having it be
502 : : * in private storage (which is what CLUSTER and friends do).
503 : : */
504 : : static inline void
549 michael@paquier.xyz 505 :CBC 1238435 : heap_execute_freeze_tuple(HeapTupleHeader tuple, HeapTupleFreeze *frz)
506 : : {
507 : 1238435 : HeapTupleHeaderSetXmax(tuple, frz->xmax);
508 : :
509 [ - + ]: 1238435 : if (frz->frzflags & XLH_FREEZE_XVAC)
549 michael@paquier.xyz 510 :UBC 0 : HeapTupleHeaderSetXvac(tuple, FrozenTransactionId);
511 : :
549 michael@paquier.xyz 512 [ - + ]:CBC 1238435 : if (frz->frzflags & XLH_INVALID_XVAC)
549 michael@paquier.xyz 513 :UBC 0 : HeapTupleHeaderSetXvac(tuple, InvalidTransactionId);
514 : :
549 michael@paquier.xyz 515 :CBC 1238435 : tuple->t_infomask = frz->t_infomask;
516 : 1238435 : tuple->t_infomask2 = frz->t_infomask2;
517 : 1238435 : }
518 : :
519 : : #endif /* HEAPAM_H */
|
