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Allow indexes on system catalogs for use in cache code.

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Thanks to Hiroshi
This commit is contained in:
Bruce Momjian
1999-11-01 02:29:27 +00:00
parent 1973e90ce2
commit d16b706e7a
6 changed files with 237 additions and 53 deletions
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69
src/backend/utils/cache/catcache.c vendored
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/catcache.c,v 1.49 1999/09/18 19:07:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/catcache.c,v 1.50 1999/11/01 02:29:25 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,9 +16,12 @@
#include "access/heapam.h"
#include "access/valid.h"
#include "catalog/pg_type.h"
#include "catalog/catname.h"
#include "catalog/indexing.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/syscache.h"
static void CatCacheRemoveCTup(CatCache *cache, Dlelem *e);
static Index CatalogCacheComputeHashIndex(struct catcache * cacheInP);
@@ -805,6 +808,62 @@ InitSysCache(char *relname,
}
/* --------------------------------
* SearchSelfReferences
*
* This call searches a self referencing information,
*
* which causes a cycle in system catalog cache
*
* cache should already be initailized
* --------------------------------
*/
static HeapTuple
SearchSelfReferences(const struct catcache * cache)
{
HeapTuple ntp;
Relation rel;
static Oid indexSelfOid = 0;
static HeapTuple indexSelfTuple = 0;
if (cache->id != INDEXRELID)
return (HeapTuple)0;
if (!indexSelfOid)
{
rel = heap_openr(RelationRelationName, AccessShareLock);
ntp = ClassNameIndexScan(rel, IndexRelidIndex);
if (!HeapTupleIsValid(ntp))
elog(ERROR, "SearchSelfRefernces: %s not found in %s",
IndexRelidIndex, RelationRelationName);
indexSelfOid = ntp->t_data->t_oid;
pfree(ntp);
heap_close(rel, AccessShareLock);
}
if ((Oid)cache->cc_skey[0].sk_argument != indexSelfOid)
return (HeapTuple)0;
if (!indexSelfTuple)
{
HeapScanDesc sd;
MemoryContext oldcxt;
if (!CacheCxt)
CacheCxt = CreateGlobalMemory("Cache");
rel = heap_open(cache->relationId, AccessShareLock);
sd = heap_beginscan(rel, false, SnapshotNow, 1, cache->cc_skey);
ntp = heap_getnext(sd, 0);
if (!HeapTupleIsValid(ntp))
elog(ERROR, "SearchSelfRefernces: tuple not found");
oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
indexSelfTuple = heap_copytuple(ntp);
MemoryContextSwitchTo(oldcxt);
heap_endscan(sd);
heap_close(rel, AccessShareLock);
}
return indexSelfTuple;
}
/* --------------------------------
* SearchSysCache
*
@@ -845,6 +904,14 @@ SearchSysCache(struct catcache * cache,
cache->cc_skey[2].sk_argument = v3;
cache->cc_skey[3].sk_argument = v4;
/*
* resolve self referencing informtion
*/
if (ntp = SearchSelfReferences(cache), ntp)
{
return heap_copytuple(ntp);
}
/* ----------------
* find the hash bucket in which to look for the tuple
* ----------------