From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 18 Feb 2003 02:53:46 +0000 (+0000)
Subject: Async_NotifyHandler must save and restore ImmediateInterruptOK.  Fixes
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=1e95b28c800bebdb2a9ea9c43942967c38d1d670;p=users%2Fbernd%2Fpostgres.git

Async_NotifyHandler must save and restore ImmediateInterruptOK.  Fixes
known problem with failure to respond to 'pg_ctl stop -m fast', and
probable problems if SIGINT or SIGTERM arrives while processing a
SIGUSR2 interrupt that arrived while waiting for a new client query.
---

diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index dc720132fb..069c3212cc 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -599,6 +599,16 @@ Async_NotifyHandler(SIGNAL_ARGS)
 
 	if (notifyInterruptEnabled)
 	{
+		bool		save_ImmediateInterruptOK = ImmediateInterruptOK;
+
+		/*
+		 * We may be called while ImmediateInterruptOK is true; turn it off
+		 * while messing with the NOTIFY state.  (We would have to save
+		 * and restore it anyway, because PGSemaphore operations inside
+		 * ProcessIncomingNotify() might reset it.)
+		 */
+		ImmediateInterruptOK = false;
+
 		/*
 		 * I'm not sure whether some flavors of Unix might allow another
 		 * SIGUSR2 occurrence to recursively interrupt this routine. To
@@ -626,6 +636,13 @@ Async_NotifyHandler(SIGNAL_ARGS)
 					elog(LOG, "Async_NotifyHandler: done");
 			}
 		}
+
+		/*
+		 * Restore ImmediateInterruptOK, and check for interrupts if needed.
+		 */
+		ImmediateInterruptOK = save_ImmediateInterruptOK;
+		if (save_ImmediateInterruptOK)
+			CHECK_FOR_INTERRUPTS();
 	}
 	else
 	{