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Reimplement hash index locking algorithms, per my recent proposal to

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pghackers.  This fixes the problem recently reported by Markus KrÌutner
(hash bucket split corrupts the state of scans being done concurrently),
and I believe it also fixes all the known problems with deadlocks in
hash index operations.  Hash indexes are still not really ready for prime
time (since they aren't WAL-logged), but this is a step forward.
This commit is contained in:
Tom Lane
2003-09-04 22:06:27 +00:00
parent ca43f71ca5
commit 7a3693716d
11 changed files with 1052 additions and 1036 deletions
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24
src/backend/storage/lmgr/lmgr.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.59 2003/08/17 22:41:12 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.60 2003/09/04 22:06:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -153,7 +153,7 @@ LockRelation(Relation relation, LOCKMODE lockmode)
* As above, but only lock if we can get the lock without blocking.
* Returns TRUE iff the lock was acquired.
*
* NOTE: we do not currently need conditional versions of the other
* NOTE: we do not currently need conditional versions of all the
* LockXXX routines in this file, but they could easily be added if needed.
*/
bool
@@ -264,6 +264,26 @@ LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode)
elog(ERROR, "LockAcquire failed");
}
/*
* ConditionalLockPage
*
* As above, but only lock if we can get the lock without blocking.
* Returns TRUE iff the lock was acquired.
*/
bool
ConditionalLockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode)
{
LOCKTAG tag;
MemSet(&tag, 0, sizeof(tag));
tag.relId = relation->rd_lockInfo.lockRelId.relId;
tag.dbId = relation->rd_lockInfo.lockRelId.dbId;
tag.objId.blkno = blkno;
return LockAcquire(LockTableId, &tag, GetCurrentTransactionId(),
lockmode, true);
}
/*
* UnlockPage
*/