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Fix relcache to account properly for subtransaction status of 'new'

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relcache entries.  Also, change TransactionIdIsCurrentTransactionId()
so that if consulted during transaction abort, it will not say that
the aborted xact is still current.  (It would be better to ensure that
it's never called at all during abort, but I'm not sure we can easily
guarantee that.)  In combination, these fix a crash we have seen
occasionally during parallel regression tests of 8.0.
This commit is contained in:
Tom Lane
2004-08-28 20:31:44 +00:00
parent f900af7961
commit 1c72d0dec1
7 changed files with 132 additions and 55 deletions
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4
src/backend/access/nbtree/nbtpage.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.77 2004/07/21 22:31:20 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.78 2004/08/28 20:31:43 tgl Exp $
*
* NOTES
* Postgres btree pages look like ordinary relation pages. The opaque
@@ -483,7 +483,7 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
* new page. We can skip locking for new or temp relations,
* however, since no one else could be accessing them.
*/
needLock = !(rel->rd_isnew || rel->rd_istemp);
needLock = !RELATION_IS_LOCAL(rel);
if (needLock)
LockPage(rel, 0, ExclusiveLock);