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| author | Tatsuo Ishii <ishii@postgresql.org> | 2004-03-11 01:47:41 +0000 |
|---|---|---|
| committer | Tatsuo Ishii <ishii@postgresql.org> | 2004-03-11 01:47:41 +0000 |
| commit | 0b86ade1c2f3dcd2407e535baad1654e65252316 (patch) | |
| tree | f643be1064f229e2245c30467e2d12923ba0f677 /src/backend/access/heap/heapam.c | |
| parent | 60a068b3897a27cbb1a13a6b050d05a0ca479055 (diff) | |
| download | postgresql-0b86ade1c2f3dcd2407e535baad1654e65252316.tar.gz postgresql-0b86ade1c2f3dcd2407e535baad1654e65252316.zip | |
Add NOWAIT option to LOCK command
Diffstat (limited to 'src/backend/access/heap/heapam.c')
| -rw-r--r-- | src/backend/access/heap/heapam.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c index d98e3fd16c2..902f0621377 100644 --- a/src/backend/access/heap/heapam.c +++ b/src/backend/access/heap/heapam.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.162 2004/01/16 20:51:30 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.163 2004/03/11 01:47:35 ishii Exp $ * * * INTERFACE ROUTINES @@ -464,6 +464,33 @@ relation_open(Oid relationId, LOCKMODE lockmode) return r; } +Relation +conditional_relation_open(Oid relationId, LOCKMODE lockmode, bool nowait) +{ + Relation r; + + Assert(lockmode >= NoLock && lockmode < MAX_LOCKMODES); + + /* The relcache does all the real work... */ + r = RelationIdGetRelation(relationId); + + if (!RelationIsValid(r)) + elog(ERROR, "could not open relation with OID %u", relationId); + + if (lockmode != NoLock) + { + if (nowait) + { + if (!ConditionalLockRelation(r, lockmode)) + elog(ERROR, "could not aquire relation lock"); + } + else + LockRelation(r, lockmode); + } + + return r; +} + /* ---------------- * relation_openrv - open any relation specified by a RangeVar * |