summaryrefslogtreecommitdiffstats
path: root/src/backend/optimizer/geqo/geqo_random.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
commit5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch)
tree739caf8c461053357daa9f162bef34516c7bf452 /src/backend/optimizer/geqo/geqo_random.c
parentInitial commit. (diff)
downloadpostgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz
postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/backend/optimizer/geqo/geqo_random.c')
-rw-r--r--src/backend/optimizer/geqo/geqo_random.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/backend/optimizer/geqo/geqo_random.c b/src/backend/optimizer/geqo/geqo_random.c
new file mode 100644
index 0000000..c6b7648
--- /dev/null
+++ b/src/backend/optimizer/geqo/geqo_random.c
@@ -0,0 +1,45 @@
+/*------------------------------------------------------------------------
+ *
+ * geqo_random.c
+ * random number generator
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/backend/optimizer/geqo/geqo_random.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "optimizer/geqo_random.h"
+
+
+void
+geqo_set_seed(PlannerInfo *root, double seed)
+{
+ GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
+
+ pg_prng_fseed(&private->random_state, seed);
+}
+
+double
+geqo_rand(PlannerInfo *root)
+{
+ GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
+
+ return pg_prng_double(&private->random_state);
+}
+
+int
+geqo_randint(PlannerInfo *root, int upper, int lower)
+{
+ GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
+
+ /*
+ * In current usage, "lower" is never negative so we can just use
+ * pg_prng_uint64_range directly.
+ */
+ return (int) pg_prng_uint64_range(&private->random_state, lower, upper);
+}