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Make RelationForgetRelation error out if the relcache entry has nonzero

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reference count.  This avoids leaving dangling pointers around, as in
recent bug report against sequences (bug# 671).
This commit is contained in:
Tom Lane 2002-05-22 15:57:40 +00:00
parent 0352e3a783
commit df9c8e1a39
1 changed files with 29 additions and 25 deletions
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14
src/backend/utils/cache/relcache.c vendored
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.163 2002/04/27 21:24:34 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/utils/cache/relcache.c,v 1.164 2002/05/22 15:57:40 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1841,8 +1841,13 @@ RelationForgetRelation(Oid rid)
RelationIdCacheLookup(rid, relation); RelationIdCacheLookup(rid, relation);
if (PointerIsValid(relation)) if (!PointerIsValid(relation))
{ return; /* not in cache, nothing to do */
if (!RelationHasReferenceCountZero(relation))
elog(ERROR, "RelationForgetRelation: relation %u is still open", rid);
/* If local, remove from list */
if (relation->rd_myxactonly) if (relation->rd_myxactonly)
{ {
List *curr; List *curr;
@ -1858,7 +1863,7 @@ RelationForgetRelation(Oid rid)
prev = curr; prev = curr;
} }
if (curr == NIL) if (curr == NIL)
elog(FATAL, "Local relation %s not found in list", elog(ERROR, "Local relation %s not found in list",
RelationGetRelationName(relation)); RelationGetRelationName(relation));
if (prev == NIL) if (prev == NIL)
newlyCreatedRelns = lnext(newlyCreatedRelns); newlyCreatedRelns = lnext(newlyCreatedRelns);
@ -1870,7 +1875,6 @@ RelationForgetRelation(Oid rid)
/* Unconditionally destroy the relcache entry */ /* Unconditionally destroy the relcache entry */
RelationClearRelation(relation, false); RelationClearRelation(relation, false);
} }
}
/* /*
* RelationIdInvalidateRelationCacheByRelationId * RelationIdInvalidateRelationCacheByRelationId