86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* catcache.h--
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* Low-level catalog cache definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: catcache.h,v 1.1.1.1 1996/07/09 06:22:01 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef CATCACHE_H
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#define CATCACHE_H
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/* #define CACHEDEBUG turns DEBUG elogs on */
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#include "postgres.h"
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#include "access/skey.h"
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#include "access/htup.h"
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#include "utils/rel.h"
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#include "nodes/memnodes.h"
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#include "lib/dllist.h"
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/*
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* struct catctup: tuples in the cache.
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* struct catcache: information for managing a cache.
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*/
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typedef struct catctup {
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HeapTuple ct_tup; /* A pointer to a tuple */
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Dlelem *ct_node; /* points to LRU list is the CatCTup is in the cache,
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else, points to the cache if the CatCTup is in
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LRU list */
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} CatCTup;
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/* voodoo constants */
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#define NCCBUCK 500 /* CatCache buckets*/
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#define MAXTUP 300 /* Maximum # of tuples cached per cache */
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typedef struct catcache {
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Oid relationId;
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Oid indexId;
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char *cc_relname; /* relation name for defered open */
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char *cc_indname; /* index name for defered open */
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HeapTuple (*cc_iscanfunc)(); /* index scanfunction */
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TupleDesc cc_tupdesc; /* tuple descriptor from reldesc */
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int id; /* XXX could be improved -hirohama */
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short cc_ntup; /* # of tuples in this cache */
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short cc_maxtup; /* max # of tuples allowed (LRU)*/
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short cc_nkeys;
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short cc_size;
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short cc_key[4];
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short cc_klen[4];
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ScanKeyData cc_skey[4];
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struct catcache *cc_next;
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Dllist *cc_lrulist; /* LRU list, most recent first */
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Dllist *cc_cache[NCCBUCK+1];
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} CatCache;
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#define InvalidCatalogCacheId (-1)
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extern struct catcache *Caches;
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extern GlobalMemory CacheCxt;
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extern void CatalogCacheInitializeCache(struct catcache *cache,
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Relation relation);
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extern void CatalogCacheSetId(CatCache *cacheInOutP, int id);
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extern long comphash(long l, char *v);
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extern Index CatalogCacheComputeHashIndex(struct catcache *cacheInP);
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extern Index CatalogCacheComputeTupleHashIndex(struct catcache *cacheInOutP,
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Relation relation, HeapTuple tuple);
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extern void CatCacheRemoveCTup(CatCache *cache, Dlelem *e);
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extern void CatalogCacheIdInvalidate(int cacheId, Index hashIndex,
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ItemPointer pointer);
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extern void ResetSystemCache(void);
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extern CatCache *InitSysCache(char *relname, char *indname, int id, int nkeys,
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int key[], HeapTuple (*iScanfuncP)());
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extern HeapTuple SearchSysCache(struct catcache *cache, Datum v1, Datum v2,
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Datum v3, Datum v4);
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extern void RelationInvalidateCatalogCacheTuple(Relation relation,
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HeapTuple tuple, void (*function)());
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#endif /* CATCACHE_H */
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