diff options
Diffstat (limited to 'src/backend/storage/ipc/sinval.c')
| -rw-r--r-- | src/backend/storage/ipc/sinval.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/src/backend/storage/ipc/sinval.c b/src/backend/storage/ipc/sinval.c index e2c6ca2aec..d002f45489 100644 --- a/src/backend/storage/ipc/sinval.c +++ b/src/backend/storage/ipc/sinval.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.86 2008/06/19 21:32:56 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.87 2008/12/09 14:28:20 heikki Exp $ * *------------------------------------------------------------------------- */ @@ -26,8 +26,8 @@ * Because backends sitting idle will not be reading sinval events, we * need a way to give an idle backend a swift kick in the rear and make * it catch up before the sinval queue overflows and forces it to go - * through a cache reset exercise. This is done by sending SIGUSR1 - * to any backend that gets too far behind. + * through a cache reset exercise. This is done by sending + * PROCSIG_CATCHUP_INTERRUPT to any backend that gets too far behind. * * State for catchup events consists of two flags: one saying whether * the signal handler is currently allowed to call ProcessCatchupEvent @@ -144,9 +144,9 @@ ReceiveSharedInvalidMessages( /* - * CatchupInterruptHandler + * HandleCatchupInterrupt * - * This is the signal handler for SIGUSR1. + * This is called when PROCSIG_CATCHUP_INTERRUPT signal is received. * * If we are idle (catchupInterruptEnabled is set), we can safely * invoke ProcessCatchupEvent directly. Otherwise, just set a flag @@ -156,13 +156,11 @@ ReceiveSharedInvalidMessages( * since there's no longer any reason to do anything.) */ void -CatchupInterruptHandler(SIGNAL_ARGS) +HandleCatchupInterrupt(void) { - int save_errno = errno; - /* - * Note: this is a SIGNAL HANDLER. You must be very wary what you do - * here. + * Note: this is called by a SIGNAL HANDLER. + * You must be very wary what you do here. */ /* Don't joggle the elbow of proc_exit */ @@ -216,8 +214,6 @@ CatchupInterruptHandler(SIGNAL_ARGS) */ catchupInterruptOccurred = 1; } - - errno = save_errno; } /* @@ -289,7 +285,8 @@ DisableCatchupInterrupt(void) /* * ProcessCatchupEvent * - * Respond to a catchup event (SIGUSR1) from another backend. + * Respond to a catchup event (PROCSIG_CATCHUP_INTERRUPT) from another + * backend. * * This is called either directly from the SIGUSR1 signal handler, * or the next time control reaches the outer idle loop (assuming |