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Arrange for autovacuum to be killed when another operation wants to be alone

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accessing it, like DROP DATABASE.  This allows the regression tests to pass
with autovacuum enabled, which open the gates for finally enabling autovacuum
by default.
This commit is contained in:
Alvaro Herrera
2007-01-16 13:28:57 +00:00
parent 02609893da
commit eb63cc3da8
9 changed files with 59 additions and 23 deletions
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31
src/backend/storage/ipc/procarray.c
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@ -23,12 +23,14 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.20 2007/01/05 22:19:38 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.21 2007/01/16 13:28:56 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <signal.h>
#include "access/subtrans.h"
#include "access/transam.h"
#include "access/xact.h"
@ -678,7 +680,9 @@ GetSnapshotData(Snapshot snapshot, bool serializable)
}
/*
* DatabaseHasActiveBackends -- are there any backends running in the given DB
* DatabaseCancelAutovacuumActivity -- are there any backends running in the
* given DB, apart from autovacuum? If an autovacuum process is running on the
* database, kill it and restart the counting.
*
* If 'ignoreMyself' is TRUE, ignore this particular backend while checking
* for backends in the target database.
@ -691,11 +695,16 @@ GetSnapshotData(Snapshot snapshot, bool serializable)
* backend startup.
*/
bool
DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself)
DatabaseCancelAutovacuumActivity(Oid databaseId, bool ignoreMyself)
{
bool result = false;
ProcArrayStruct *arrayP = procArray;
int index;
int num;
restart:
num = 0;
CHECK_FOR_INTERRUPTS();
LWLockAcquire(ProcArrayLock, LW_SHARED);
@ -708,14 +717,22 @@ DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself)
if (ignoreMyself && proc == MyProc)
continue;
result = true;
break;
num++;
if (proc->isAutovacuum)
{
/* an autovacuum -- kill it and restart */
LWLockRelease(ProcArrayLock);
kill(proc->pid, SIGINT);
pg_usleep(100 * 1000); /* 100ms */
goto restart;
}
}
}
LWLockRelease(ProcArrayLock);
return result;
return (num != 0);
}
/*