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Check pending cancel request before waiting for lock

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This commit is contained in:
Hiroshi Inoue 2000-02-24 04:36:01 +00:00
parent a5e944580f
commit f017d7eeee
1 changed files with 21 additions and 3 deletions
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24
src/backend/storage/lmgr/proc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.69 2000/02/22 09:55:20 inoue Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.70 2000/02/24 04:36:01 inoue Exp $
*
*-------------------------------------------------------------------------
*/
@ -47,7 +47,7 @@
* This is so that we can support more backends. (system-wide semaphore
* sets run out pretty fast.) -ay 4/95
*
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.69 2000/02/22 09:55:20 inoue Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.70 2000/02/24 04:36:01 inoue Exp $
*/
#include <sys/time.h>
#include <unistd.h>
@ -481,10 +481,28 @@ ProcQueueInit(PROC_QUEUE *queue)
}
/*
* Handling cancel request while waiting for lock
*
*/
static bool lockWaiting = false;
void SetWaitingForLock(bool waiting)
{
if (waiting == lockWaiting)
return;
lockWaiting = waiting;
if (lockWaiting)
{
Assert(MyProc->links.next != INVALID_OFFSET);
if (QueryCancel) /* cancel request pending */
{
if (GetOffWaitqueue(MyProc))
{
lockWaiting = false;
elog(ERROR, "Query cancel requested while waiting lock");
}
}
}
}
void LockWaitCancel(void)
{
@ -610,7 +628,7 @@ ins:;
timeval.it_value.tv_sec = \
(DeadlockCheckTimer ? DeadlockCheckTimer : DEADLOCK_CHECK_TIMER);
lockWaiting = true;
SetWaitingForLock(true);
do
{
MyProc->errType = NO_ERROR; /* reset flag after deadlock check */