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