Further adjustment to random() seed initialization.

Per complaint from Tom Lane, don't chomp the timestamp at 32 bits, so we
can shift in some of its higher bits.

Discussion: https://postgr.es/m/14712.1542253115%40sss.pgh.pa.us

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 981a058522f6f54e08e73349ea9c1512adcdae2c..cb49f3255f9865387df9ef835172925f41b824f1 100644 (file)
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -2532,9 +2532,9 @@ InitProcessGlobals(void)
         * in a given time period.  Since that would leave only 20 bits of the
         * timestamp that cycle every ~1 second, also mix in some higher bits.
         */
-       srandom(((unsigned int) MyProcPid) ^
-                       ((unsigned int) MyStartTimestamp << 12) ^
-                       ((unsigned int) MyStartTimestamp >> 20));
+       srandom(((uint64) MyProcPid) ^
+                       ((uint64) MyStartTimestamp << 12) ^
+                       ((uint64) MyStartTimestamp >> 20));
 }