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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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31
src/backend/executor/execUtils.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.40 1998/11/27 19:52:01 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.41 1998/12/15 12:46:05 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -868,7 +868,23 @@ ExecOpenIndices(Oid resultRelationOid,
indexOid = lfirsti(indexoid);
indexDesc = index_open(indexOid);
if (indexDesc != NULL)
{
relationDescs[i++] = indexDesc;
/*
* Hack for not btree and hash indices: they use relation level
* exclusive locking on updation (i.e. - they are not ready
* for MVCC) and so we have to exclusively lock indices here
* to prevent deadlocks if we will scan them - index_beginscan
* places AccessShareLock, indices update methods don't use
* locks at all. We release this lock in ExecCloseIndices.
* Note, that hashes use page level locking - i.e. are not
* deadlock-free, - let's them be on their way -:))
* vadim 03-12-1998
*/
if (indexDesc->rd_rel->relam != BTREE_AM_OID &&
indexDesc->rd_rel->relam != HASH_AM_OID)
LockRelation(indexDesc, AccessExclusiveLock);
}
}
/* ----------------
@ -948,9 +964,18 @@ ExecCloseIndices(RelationInfo *resultRelationInfo)
relationDescs = resultRelationInfo->ri_IndexRelationDescs;
for (i = 0; i < numIndices; i++)
if (relationDescs[i] != NULL)
index_close(relationDescs[i]);
{
if (relationDescs[i] == NULL)
continue;
/*
* Notes in ExecOpenIndices.
*/
if (relationDescs[i]->rd_rel->relam != BTREE_AM_OID &&
relationDescs[i]->rd_rel->relam != HASH_AM_OID)
UnlockRelation(relationDescs[i], AccessExclusiveLock);
index_close(relationDescs[i]);
}
/*
* XXX should free indexInfo array here too.
*/