78 lines
2.4 KiB
C
78 lines
2.4 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 1.18 1999/07/15 23:04:20 momjian 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 "access/htup.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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{
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HeapTuple ct_tup; /* A pointer to a tuple */
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/* Each tuple in the cache has two catctup items, one in the LRU list
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* and one in the hashbucket list for its hash value. ct_node in each
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* one points to the other one.
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*/
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Dlelem *ct_node; /* the other catctup for this tuple */
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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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{
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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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bool busy; /* for detecting recursive lookups */
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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]; /* hash buckets */
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} CatCache;
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#define InvalidCatalogCacheId (-1)
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extern GlobalMemory CacheCxt;
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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 void SystemCacheRelationFlushed(Oid relId);
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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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