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Back-patch assorted latch-related fixes.

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Fix a whole bunch of signal handlers that had been hacked to do things that
might change errno, without adding the necessary save/restore logic for
errno.  Also make some minor fixes in unix_latch.c, and clean up bizarre
and unsafe scheme for disowning the process's latch.  While at it, rename
the PGPROC latch field to procLatch for consistency with 9.2.

Issues noted while reviewing a patch by Peter Geoghegan.
This commit is contained in:
Tom Lane
2011-08-10 12:20:45 -04:00
parent 74d099494c
commit 989f530d3f
9 changed files with 124 additions and 39 deletions
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16
src/backend/access/transam/xlog.c
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@ -9881,34 +9881,50 @@ startupproc_quickdie(SIGNAL_ARGS)
static void
StartupProcSigUsr1Handler(SIGNAL_ARGS)
{
int save_errno = errno;
latch_sigusr1_handler();
errno = save_errno;
}
/* SIGUSR2: set flag to finish recovery */
static void
StartupProcTriggerHandler(SIGNAL_ARGS)
{
int save_errno = errno;
promote_triggered = true;
WakeupRecovery();
errno = save_errno;
}
/* SIGHUP: set flag to re-read config file at next convenient time */
static void
StartupProcSigHupHandler(SIGNAL_ARGS)
{
int save_errno = errno;
got_SIGHUP = true;
WakeupRecovery();
errno = save_errno;
}
/* SIGTERM: set flag to abort redo and exit */
static void
StartupProcShutdownHandler(SIGNAL_ARGS)
{
int save_errno = errno;
if (in_restore_command)
proc_exit(1);
else
shutdown_requested = true;
WakeupRecovery();
errno = save_errno;
}
/* Handle SIGHUP and SIGTERM signals of startup process */