static void
CatalogCacheInitializeCache(CatCache *cache)
{
Relation relation;
MemoryContext oldcxt;
TupleDesc tupdesc;
int i;
CatalogCacheInitializeCache_DEBUG1;
relation = heap_open(cache->cc_reloid, AccessShareLock);
/*
* switch to the cache context so our allocations do not vanish at the end
* of a transaction
*/
Assert(CacheMemoryContext != NULL);
oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
/*
* copy the relcache's tuple descriptor to permanent cache storage
*/
tupdesc = CreateTupleDescCopyConstr(RelationGetDescr(relation));
/*
* save the relation's name and relisshared flag, too (cc_relname is used
* only for debugging purposes)
*/
cache->cc_relname = pstrdup(RelationGetRelationName(relation));
cache->cc_relisshared = RelationGetForm(relation)->relisshared;
/*
* return to the caller's memory context and close the rel
*/
MemoryContextSwitchTo(oldcxt);
heap_close(relation, AccessShareLock);
CACHE3_elog(DEBUG2, "CatalogCacheInitializeCache: %s, %d keys",
cache->cc_relname, cache->cc_nkeys);
/*
* initialize cache's key information
*/
for (i = 0; i < cache->cc_nkeys; ++i)
{
Oid keytype;
RegProcedure eqfunc;
CatalogCacheInitializeCache_DEBUG2;
if (cache->cc_key[i] > 0)
keytype = tupdesc->attrs[cache->cc_key[i] - 1]->atttypid;
else
{
if (cache->cc_key[i] != ObjectIdAttributeNumber)
elog(FATAL, "only sys attr supported in caches is OID");
keytype = OIDOID;
}
GetCCHashEqFuncs(keytype,
&cache->cc_hashfunc[i],
&eqfunc);
cache->cc_isname[i] = (keytype == NAMEOID);
/*
* Do equality-function lookup (we assume this won't need a catalog
* lookup for any supported type)
*/
fmgr_info_cxt(eqfunc,
&cache->cc_skey[i].sk_func,
CacheMemoryContext);
/* Initialize sk_attno suitably for HeapKeyTest() and heap scans */
cache->cc_skey[i].sk_attno = cache->cc_key[i];
/* Fill in sk_strategy as well --- always standard equality */
cache->cc_skey[i].sk_strategy = BTEqualStrategyNumber;
cache->cc_skey[i].sk_subtype = InvalidOid;
/* Currently, there are no catcaches on collation-aware data types */
cache->cc_skey[i].sk_collation = InvalidOid;
CACHE4_elog(DEBUG2, "CatalogCacheInitializeCache %s %d %p",
cache->cc_relname,
i,
cache);
}
/*
* mark this cache fully initialized
*/
cache->cc_tupdesc = tupdesc;
}
static void
CatalogCacheInitializeCache(CatCache *cache)
{
Relation relation;
MemoryContext oldcxt;
TupleDesc tupdesc;
int i;
CatalogCacheInitializeCache_DEBUG2;
/*
* Open the relation without locking --- we only need the tupdesc,
* which we assume will never change ...
*/
relation = heap_openr(cache->cc_relname, NoLock);
Assert(RelationIsValid(relation));
/*
* switch to the cache context so our allocations do not vanish at the
* end of a transaction
*/
Assert(CacheMemoryContext != NULL);
oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
/*
* copy the relcache's tuple descriptor to permanent cache storage
*/
tupdesc = CreateTupleDescCopyConstr(RelationGetDescr(relation));
/*
* get the relation's OID and relisshared flag, too
*/
cache->cc_reloid = RelationGetRelid(relation);
cache->cc_relisshared = RelationGetForm(relation)->relisshared;
/*
* return to the caller's memory context and close the rel
*/
MemoryContextSwitchTo(oldcxt);
heap_close(relation, NoLock);
CACHE3_elog(DEBUG2, "CatalogCacheInitializeCache: %s, %d keys",
cache->cc_relname, cache->cc_nkeys);
/*
* initialize cache's key information
*/
for (i = 0; i < cache->cc_nkeys; ++i)
{
Oid keytype;
CatalogCacheInitializeCache_DEBUG2;
if (cache->cc_key[i] > 0)
keytype = tupdesc->attrs[cache->cc_key[i] - 1]->atttypid;
else
{
if (cache->cc_key[i] != ObjectIdAttributeNumber)
elog(FATAL, "only sys attr supported in caches is OID");
keytype = OIDOID;
}
GetCCHashEqFuncs(keytype,
&cache->cc_hashfunc[i],
&cache->cc_skey[i].sk_procedure);
cache->cc_isname[i] = (keytype == NAMEOID);
/*
* Do equality-function lookup (we assume this won't need a
* catalog lookup for any supported type)
*/
fmgr_info_cxt(cache->cc_skey[i].sk_procedure,
&cache->cc_skey[i].sk_func,
CacheMemoryContext);
/* Initialize sk_attno suitably for HeapKeyTest() and heap scans */
cache->cc_skey[i].sk_attno = cache->cc_key[i];
CACHE4_elog(DEBUG2, "CatalogCacheInit %s %d %p",
cache->cc_relname,
i,
cache);
}
/*
* mark this cache fully initialized
*/
cache->cc_tupdesc = tupdesc;
}
