Age         Owner                  TLA  Line data    Source code

                                  1                 : /*------------------------------------------------------------------------
                                  2                 :  *
                                  3                 :  * geqo_random.c
                                  4                 :  *     random number generator
                                  5                 :  *
                                  6                 :  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
                                  7                 :  * Portions Copyright (c) 1994, Regents of the University of California
                                  8                 :  *
                                  9                 :  * src/backend/optimizer/geqo/geqo_random.c
                                 10                 :  *
                                 11                 :  *-------------------------------------------------------------------------
                                 12                 :  */
                                 13                 : 
                                 14                 : #include "postgres.h"
                                 15                 : 
                                 16                 : #include "optimizer/geqo_random.h"
                                 17                 : 
                                 18                 : 
                                 19                 : void
 5896 tgl@sss.pgh.pa.us          20 CBC           3 : geqo_set_seed(PlannerInfo *root, double seed)
                                 21                 : {
                                 22               3 :     GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
                                 23                 : 
 1378                            24               3 :     pg_prng_fseed(&private->random_state, seed);
 5896                            25               3 : }
                                 26                 : 
                                 27                 : double
                                 28             390 : geqo_rand(PlannerInfo *root)
                                 29                 : {
                                 30             390 :     GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
                                 31                 : 
 1378                            32             390 :     return pg_prng_double(&private->random_state);
                                 33                 : }
                                 34                 : 
                                 35                 : int
                                 36            1155 : geqo_randint(PlannerInfo *root, int upper, int lower)
                                 37                 : {
                                 38            1155 :     GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
                                 39                 : 
                                 40                 :     /*
                                 41                 :      * In current usage, "lower" is never negative so we can just use
                                 42                 :      * pg_prng_uint64_range directly.
                                 43                 :      */
                                 44            1155 :     return (int) pg_prng_uint64_range(&private->random_state, lower, upper);
                                 45                 : }