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maintained for each cache entry. A cache entry will not be freed until the matching ReleaseSysCache call has been executed. This eliminates worries about cache entries getting dropped while still in use. See my posting to pg-hackers of even date for more info.
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* syscache.h
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* System catalog cache definitions.
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*
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* See also lsyscache.h, which provides convenience routines for
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* common cache-lookup operations.
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: syscache.h,v 1.27 2000/11/16 22:30:49 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SYSCACHE_H
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#define SYSCACHE_H
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#include "access/htup.h"
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/*
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* Declarations for util/syscache.c.
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*
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* SysCache identifiers.
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*
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* The order of these must match the order
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* they are entered into the structure cacheinfo[] in syscache.c.
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* Keep them in alphabetical order.
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*/
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#define AGGNAME 0
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#define AMNAME 1
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#define AMOPOPID 2
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#define AMOPSTRATEGY 3
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#define ATTNAME 4
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#define ATTNUM 5
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#define CLADEFTYPE 6
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#define CLANAME 7
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#define GRONAME 8
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#define GROSYSID 9
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#define INDEXRELID 10
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#define INHRELID 11
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#define LANGNAME 12
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#define LANGOID 13
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#define LISTENREL 14
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#define OPERNAME 15
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#define OPEROID 16
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#define PROCNAME 17
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#define PROCOID 18
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#define RELNAME 19
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#define RELOID 20
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#define RULENAME 21
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#define RULEOID 22
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#define SHADOWNAME 23
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#define SHADOWSYSID 24
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#define STATRELID 25
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#define TYPENAME 26
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#define TYPEOID 27
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extern void InitCatalogCache(void);
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extern HeapTuple SearchSysCache(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern void ReleaseSysCache(HeapTuple tuple);
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/* convenience routines */
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extern HeapTuple SearchSysCacheCopy(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern Oid GetSysCacheOid(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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/* macro for just probing for existence of a tuple via the syscache */
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#define SearchSysCacheExists(c,k1,k2,k3,k4) \
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OidIsValid(GetSysCacheOid(c,k1,k2,k3,k4))
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extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup,
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AttrNumber attributeNumber, bool *isNull);
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#endif /* SYSCACHE_H */
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