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Re-order pg_listener index so it can later be used in an index scan.

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This commit is contained in:
Bruce Momjian
2000-06-07 04:09:44 +00:00
parent 75b950f668
commit 7d301947e5
5 changed files with 27 additions and 42 deletions
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33
src/backend/commands/async.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.63 2000/06/04 01:44:29 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.64 2000/06/07 04:09:34 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -159,7 +159,6 @@ Async_Notify(char *relname)
/* no point in making duplicate entries in the list ... */
if (!AsyncExistsPendingNotify(relname))
{
/*
* We allocate list memory from the global malloc pool to ensure
* that it will live until we want to use it. This is probably
@@ -202,7 +201,6 @@ Async_Listen(char *relname, int pid)
Datum d;
int i;
bool isnull;
int alreadyListener = 0;
TupleDesc tupDesc;
if (Trace_notify)
@@ -212,25 +210,12 @@ Async_Listen(char *relname, int pid)
tdesc = RelationGetDescr(lRel);
/* Detect whether we are already listening on this relname */
scan = heap_beginscan(lRel, 0, SnapshotNow, 0, (ScanKey) NULL);
while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
{
d = heap_getattr(tuple, Anum_pg_listener_relname, tdesc, &isnull);
if (!strncmp((char *) DatumGetPointer(d), relname, NAMEDATALEN))
{
d = heap_getattr(tuple, Anum_pg_listener_pid, tdesc, &isnull);
if (DatumGetInt32(d) == pid)
{
alreadyListener = 1;
/* No need to scan the rest of the table */
break;
}
}
}
heap_endscan(scan);
if (alreadyListener)
tuple = SearchSysCacheTuple(LISTENREL, Int32GetDatum(pid),
PointerGetDatum(relname),
0, 0);
if (tuple != NULL)
{
/* No need to scan the rest of the table */
heap_close(lRel, AccessExclusiveLock);
elog(NOTICE, "Async_Listen: We are already listening on %s", relname);
return;
@@ -313,9 +298,9 @@ Async_Unlisten(char *relname, int pid)
lRel = heap_openr(ListenerRelationName, AccessExclusiveLock);
/* Note we assume there can be only one matching tuple. */
lTuple = SearchSysCacheTuple(LISTENREL, PointerGetDatum(relname),
Int32GetDatum(pid),
0, 0);
lTuple = SearchSysCacheTuple(LISTENREL, Int32GetDatum(pid),
PointerGetDatum(relname),
0, 0);
if (lTuple != NULL)
heap_delete(lRel, &lTuple->t_self, NULL);
heap_close(lRel, AccessExclusiveLock);