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Make RelationForgetRelation error out if the relcache entry has nonzero 

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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54
src/backend/utils/cache/relcache.c vendored
View File

@ -8,7 +8,7 @@
*
*
* 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 $
*
*-------------------------------------------------------------------------
*/
@ -1841,35 +1841,39 @@ RelationForgetRelation(Oid rid)
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 *prev = NIL;
foreach(curr, newlyCreatedRelns)
{
List *curr;
List *prev = NIL;
Relation reln = lfirst(curr);
foreach(curr, newlyCreatedRelns)
{
Relation reln = lfirst(curr);
Assert(reln != NULL && reln->rd_myxactonly);
if (RelationGetRelid(reln) == rid)
break;
prev = curr;
}
if (curr == NIL)
elog(FATAL, "Local relation %s not found in list",
RelationGetRelationName(relation));
if (prev == NIL)
newlyCreatedRelns = lnext(newlyCreatedRelns);
else
lnext(prev) = lnext(curr);
pfree(curr);
Assert(reln != NULL && reln->rd_myxactonly);
if (RelationGetRelid(reln) == rid)
break;
prev = curr;
}
/* Unconditionally destroy the relcache entry */
RelationClearRelation(relation, false);
if (curr == NIL)
elog(ERROR, "Local relation %s not found in list",
RelationGetRelationName(relation));
if (prev == NIL)
newlyCreatedRelns = lnext(newlyCreatedRelns);
else
lnext(prev) = lnext(curr);
pfree(curr);
}
/* Unconditionally destroy the relcache entry */
RelationClearRelation(relation, false);
}
/*