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Further adjustment to random() seed initialization.

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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
This commit is contained in:
Thomas Munro 2018-11-15 17:10:43 +13:00
parent 5b0ce3ec33
commit ab8984f52d
1 changed files with 3 additions and 3 deletions
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6
src/backend/postmaster/postmaster.c
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@ -2532,9 +2532,9 @@ InitProcessGlobals(void)
* in a given time period. Since that would leave only 20 bits of the * 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. * timestamp that cycle every ~1 second, also mix in some higher bits.
*/ */
srandom(((unsigned int) MyProcPid) ^ srandom(((uint64) MyProcPid) ^
((unsigned int) MyStartTimestamp << 12) ^ ((uint64) MyStartTimestamp << 12) ^
((unsigned int) MyStartTimestamp >> 20)); ((uint64) MyStartTimestamp >> 20));
} }