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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2004-10-07 00:03:15 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2004-10-07 00:03:15 +0000 |
| commit | 52a45818a13bc32156ada02554eef76e1124b618 (patch) | |
| tree | a965aaaaa0586f9025905429a084d96e3410fdd4 /src | |
| parent | f629583f944490b184c5c69f652c5bc067e85705 (diff) | |
| download | postgresql-52a45818a13bc32156ada02554eef76e1124b618.tar.gz postgresql-52a45818a13bc32156ada02554eef76e1124b618.zip | |
XOR process PID into a backend's initial random seed, to ensure that
different backends get a reasonably wide set of initial seeds even if
gettimeofday returns tv_usec values with only a few bits of precision.
Per recent discussion.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/postmaster/postmaster.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c index 34d71483ef5..3fa5409c3fa 100644 --- a/src/backend/postmaster/postmaster.c +++ b/src/backend/postmaster/postmaster.c @@ -37,7 +37,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.426 2004/10/06 09:35:21 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.427 2004/10/07 00:03:15 tgl Exp $ * * NOTES * @@ -2575,8 +2575,6 @@ static int BackendRun(Port *port) { int status; - struct timeval now; - struct timezone tz; char remote_host[NI_MAXHOST]; char remote_port[NI_MAXSERV]; char remote_ps_data[NI_MAXHOST]; @@ -2754,9 +2752,7 @@ BackendRun(Port *port) * start a new random sequence in the random() library function. */ random_seed = 0; - gettimeofday(&now, &tz); - srandom((unsigned int) now.tv_usec); - + srandom((unsigned int) (MyProcPid ^ port->session_start.tv_usec)); /* ---------------- * Now, build the argv vector that will be given to PostgresMain. |