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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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30
src/backend/commands/async.c
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@@ -6,7 +6,7 @@
* Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.42 1998/11/27 19:51:53 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.43 1998/12/15 12:45:50 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@@ -218,7 +218,7 @@ Async_Listen(char *relname, int pid)
TPRINTF(TRACE_NOTIFY, "Async_Listen: %s", relname);
lRel = heap_openr(ListenerRelationName);
RelationSetLockForWrite(lRel);
LockRelation(lRel, AccessExclusiveLock);
tdesc = RelationGetDescr(lRel);
/* Detect whether we are already listening on this relname */
@@ -242,7 +242,7 @@ Async_Listen(char *relname, int pid)
if (alreadyListener)
{
elog(NOTICE, "Async_Listen: We are already listening on %s", relname);
RelationUnsetLockForWrite(lRel);
UnlockRelation(lRel, AccessExclusiveLock);
heap_close(lRel);
return;
}
@@ -267,7 +267,7 @@ Async_Listen(char *relname, int pid)
heap_insert(lRel, newtup);
pfree(newtup);
RelationUnsetLockForWrite(lRel);
UnlockRelation(lRel, AccessExclusiveLock);
heap_close(lRel);
/*
@@ -320,9 +320,9 @@ Async_Unlisten(char *relname, int pid)
if (lTuple != NULL)
{
lRel = heap_openr(ListenerRelationName);
RelationSetLockForWrite(lRel);
heap_delete(lRel, &lTuple->t_self);
RelationUnsetLockForWrite(lRel);
LockRelation(lRel, AccessExclusiveLock);
heap_delete(lRel, &lTuple->t_self, NULL);
UnlockRelation(lRel, AccessExclusiveLock);
heap_close(lRel);
}
/* We do not complain about unlistening something not being listened;
@@ -358,7 +358,7 @@ Async_UnlistenAll()
TPRINTF(TRACE_NOTIFY, "Async_UnlistenAll");
lRel = heap_openr(ListenerRelationName);
RelationSetLockForWrite(lRel);
LockRelation(lRel, AccessExclusiveLock);
tdesc = RelationGetDescr(lRel);
/* Find and delete all entries with my listenerPID */
@@ -369,10 +369,10 @@ Async_UnlistenAll()
sRel = heap_beginscan(lRel, 0, SnapshotNow, 1, key);
while (HeapTupleIsValid(lTuple = heap_getnext(sRel, 0)))
heap_delete(lRel, &lTuple->t_self);
heap_delete(lRel, &lTuple->t_self, NULL);
heap_endscan(sRel);
RelationUnsetLockForWrite(lRel);
UnlockRelation(lRel, AccessExclusiveLock);
heap_close(lRel);
}
@@ -463,7 +463,7 @@ AtCommit_Notify()
TPRINTF(TRACE_NOTIFY, "AtCommit_Notify");
lRel = heap_openr(ListenerRelationName);
RelationSetLockForWrite(lRel);
LockRelation(lRel, AccessExclusiveLock);
tdesc = RelationGetDescr(lRel);
sRel = heap_beginscan(lRel, 0, SnapshotNow, 0, (ScanKey) NULL);
@@ -516,7 +516,7 @@ AtCommit_Notify()
* but as far as I can see we should just do it for any
* failure (certainly at least for EPERM too...)
*/
heap_delete(lRel, &lTuple->t_self);
heap_delete(lRel, &lTuple->t_self, NULL);
}
else
#endif
@@ -527,7 +527,7 @@ AtCommit_Notify()
{
rTuple = heap_modifytuple(lTuple, lRel,
value, nulls, repl);
heap_replace(lRel, &lTuple->t_self, rTuple);
heap_replace(lRel, &lTuple->t_self, rTuple, NULL);
}
}
}
@@ -741,7 +741,7 @@ ProcessIncomingNotify(void)
StartTransactionCommand();
lRel = heap_openr(ListenerRelationName);
RelationSetLockForWrite(lRel);
LockRelation(lRel, AccessExclusiveLock);
tdesc = RelationGetDescr(lRel);
/* Scan only entries with my listenerPID */
@@ -772,7 +772,7 @@ ProcessIncomingNotify(void)
NotifyMyFrontEnd(relname, sourcePID);
/* Rewrite the tuple with 0 in notification column */
rTuple = heap_modifytuple(lTuple, lRel, value, nulls, repl);
heap_replace(lRel, &lTuple->t_self, rTuple);
heap_replace(lRel, &lTuple->t_self, rTuple, NULL);
}
}
heap_endscan(sRel);