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Commit52a4581

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XOR process PID into a backend's initial random seed, to ensure that
different backends get a reasonably wide set of initial seeds even ifgettimeofday returns tv_usec values with only a few bits of precision.Per recent discussion.
1 parentf629583 commit52a4581

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‎src/backend/postmaster/postmaster.c

Lines changed: 2 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.426 2004/10/06 09:35:21 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.427 2004/10/07 00:03:15 tgl Exp $
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*
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* NOTES
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*
@@ -2575,8 +2575,6 @@ static int
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BackendRun(Port*port)
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{
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intstatus;
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structtimevalnow;
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structtimezonetz;
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charremote_host[NI_MAXHOST];
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charremote_port[NI_MAXSERV];
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charremote_ps_data[NI_MAXHOST];
@@ -2754,9 +2752,7 @@ BackendRun(Port *port)
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* start a new random sequence in the random() library function.
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*/
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random_seed=0;
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gettimeofday(&now,&tz);
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srandom((unsignedint)now.tv_usec);
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srandom((unsignedint) (MyProcPid ^port->session_start.tv_usec));
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/* ----------------
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* Now, build the argv vector that will be given to PostgresMain.

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