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Don't go belly-up if fork() fails for a routine checkpoint subprocess.

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Just try again later.
This commit is contained in:
Tom Lane 2001-03-14 17:58:46 +00:00
parent 286d1fc382
commit 5dd04603b9
1 changed files with 20 additions and 4 deletions
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24
src/backend/postmaster/postmaster.c
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@ -28,7 +28,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.209 2001/03/13 01:17:05 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.210 2001/03/14 17:58:46 tgl Exp $
* *
* NOTES * NOTES
* *
@ -804,6 +804,11 @@ ServerLoop(void)
{ {
/* Time to make the checkpoint... */ /* Time to make the checkpoint... */
CheckPointPID = CheckPointDataBase(); CheckPointPID = CheckPointDataBase();
/* if fork failed, schedule another try at 0.1 normal delay */
if (CheckPointPID == 0)
{
checkpointed = now - (9 * CheckPointTimeout) / 10;
}
} }
} }
@ -2124,6 +2129,7 @@ schedule_checkpoint(SIGNAL_ARGS)
Shutdown == NoShutdown && !FatalError) Shutdown == NoShutdown && !FatalError)
{ {
CheckPointPID = CheckPointDataBase(); CheckPointPID = CheckPointDataBase();
/* note: if fork fails, CheckPointPID stays 0; nothing happens */
} }
errno = save_errno; errno = save_errno;
@ -2264,6 +2270,9 @@ InitSSL(void)
/* /*
* Fire off a subprocess for startup/shutdown/checkpoint. * Fire off a subprocess for startup/shutdown/checkpoint.
*
* Return value is subprocess' PID, or 0 if failed to start subprocess
* (0 is returned only for checkpoint case).
*/ */
static pid_t static pid_t
SSDataBase(int xlop) SSDataBase(int xlop)
@ -2332,8 +2341,15 @@ SSDataBase(int xlop)
fprintf(stderr, "%s Data Base: fork failed: %s\n", fprintf(stderr, "%s Data Base: fork failed: %s\n",
((xlop == BS_XLOG_STARTUP) ? "Startup" : ((xlop == BS_XLOG_STARTUP) ? "Startup" :
((xlop == BS_XLOG_CHECKPOINT) ? "CheckPoint" : ((xlop == BS_XLOG_CHECKPOINT) ? "CheckPoint" :
"Shutdown")), strerror(errno)); "Shutdown")),
strerror(errno));
/*
* fork failure is fatal during startup/shutdown, but there's
* no need to choke if a routine checkpoint fails.
*/
if (xlop == BS_XLOG_CHECKPOINT)
return 0;
ExitPostmaster(1); ExitPostmaster(1);
} }
@ -2363,7 +2379,7 @@ SSDataBase(int xlop)
TouchSocketLockFile(); TouchSocketLockFile();
} }
return (pid); return pid;
} }