diff options
Diffstat (limited to 'src/backend/storage/ipc/sinval.c')
| -rw-r--r-- | src/backend/storage/ipc/sinval.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/src/backend/storage/ipc/sinval.c b/src/backend/storage/ipc/sinval.c index d002f45489..c8d3a114c4 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 1.87 2008/12/09 14:28:20 heikki Exp $ + * $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.88 2008/12/09 15:59:39 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 - * PROCSIG_CATCHUP_INTERRUPT to any backend that gets too far behind. + * through a cache reset exercise. This is done by sending SIGUSR1 + * 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( /* - * HandleCatchupInterrupt + * CatchupInterruptHandler * - * This is called when PROCSIG_CATCHUP_INTERRUPT signal is received. + * This is the signal handler for SIGUSR1. * * If we are idle (catchupInterruptEnabled is set), we can safely * invoke ProcessCatchupEvent directly. Otherwise, just set a flag @@ -156,11 +156,13 @@ ReceiveSharedInvalidMessages( * since there's no longer any reason to do anything.) */ void -HandleCatchupInterrupt(void) +CatchupInterruptHandler(SIGNAL_ARGS) { + int save_errno = errno; + /* - * Note: this is called by a SIGNAL HANDLER. - * You must be very wary what you do here. + * Note: this is a SIGNAL HANDLER. You must be very wary what you do + * here. */ /* Don't joggle the elbow of proc_exit */ @@ -214,6 +216,8 @@ HandleCatchupInterrupt(void) */ catchupInterruptOccurred = 1; } + + errno = save_errno; } /* @@ -285,8 +289,7 @@ DisableCatchupInterrupt(void) /* * ProcessCatchupEvent * - * Respond to a catchup event (PROCSIG_CATCHUP_INTERRUPT) from another - * backend. + * Respond to a catchup event (SIGUSR1) from another backend. * * This is called either directly from the SIGUSR1 signal handler, * or the next time control reaches the outer idle loop (assuming |