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Provide support for multiplexing SIGUSR1 signal. The upcoming synchronous

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replication patch needs a signal, but we've already used SIGUSR1 and
SIGUSR2 in normal backends. This patch allows reusing SIGUSR1 for that,
and for other purposes too if the need arises.
This commit is contained in:
Heikki Linnakangas
2008-12-09 14:28:20 +00:00
parent 9edd720050
commit 7b05b3fa39
10 changed files with 143 additions and 45 deletions
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11
src/backend/commands/async.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.142 2008/11/02 01:45:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.143 2008/12/09 14:28:20 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -915,9 +915,10 @@ EnableNotifyInterrupt(void)
* a frontend command. Signal handler execution of inbound notifies
* is disabled until the next EnableNotifyInterrupt call.
*
* The SIGUSR1 signal handler also needs to call this, so as to
* prevent conflicts if one signal interrupts the other. So we
* must return the previous state of the flag.
* This also needs to be called when SIGUSR1 with
* PROCSIG_CATCHUP_INTERRUPT is received, so as to prevent conflicts
* if one signal interrupts the other. So we must return the previous
* state of the flag.
*/
bool
DisableNotifyInterrupt(void)
@@ -954,7 +955,7 @@ ProcessIncomingNotify(void)
nulls[Natts_pg_listener];
bool catchup_enabled;
/* Must prevent SIGUSR1 interrupt while I am running */
/* Must prevent catchup interrupt while I am running */
catchup_enabled = DisableCatchupInterrupt();
if (Trace_notify)