relcache.h

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/*-------------------------------------------------------------------------
 *
 * relcache.h
 *    Relation descriptor cache definitions.
 *
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/relcache.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef RELCACHE_H
#define RELCACHE_H

#include "access/tupdesc.h"
#include "nodes/bitmapset.h"


typedef struct RelationData *Relation;

/* ----------------
 *      RelationPtr is used in the executor to support index scans
 *      where we have to keep track of several index relations in an
 *      array.  -cim 9/10/89
 * ----------------
 */
typedef Relation *RelationPtr;

/*
 * Routines to open (lookup) and close a relcache entry
 */
extern Relation RelationIdGetRelation(Oid relationId);
extern void RelationClose(Relation relation);

/*
 * Routines to compute/retrieve additional cached information
 */
extern List *RelationGetIndexList(Relation relation);
extern Oid  RelationGetOidIndex(Relation relation);
extern List *RelationGetIndexExpressions(Relation relation);
extern List *RelationGetIndexPredicate(Relation relation);
extern Bitmapset *RelationGetIndexAttrBitmap(Relation relation, bool keyAttrs);
extern void RelationGetExclusionInfo(Relation indexRelation,
                         Oid **operators,
                         Oid **procs,
                         uint16 **strategies);

extern void RelationSetIndexList(Relation relation,
                     List *indexIds, Oid oidIndex);

extern void RelationInitIndexAccessInfo(Relation relation);

/*
 * Routines to support ereport() reports of relation-related errors
 */
extern int  errtable(Relation rel);
extern int  errtablecol(Relation rel, int attnum);
extern int  errtablecolname(Relation rel, const char *colname);
extern int  errtableconstraint(Relation rel, const char *conname);

/*
 * Routines for backend startup
 */
extern void RelationCacheInitialize(void);
extern void RelationCacheInitializePhase2(void);
extern void RelationCacheInitializePhase3(void);

/*
 * Routine to create a relcache entry for an about-to-be-created relation
 */
extern Relation RelationBuildLocalRelation(const char *relname,
                           Oid relnamespace,
                           TupleDesc tupDesc,
                           Oid relid,
                           Oid relfilenode,
                           Oid reltablespace,
                           bool shared_relation,
                           bool mapped_relation,
                           char relpersistence,
                           char relkind);

/*
 * Routine to manage assignment of new relfilenode to a relation
 */
extern void RelationSetNewRelfilenode(Relation relation,
                          TransactionId freezeXid, MultiXactId minmulti);

/*
 * Routines for flushing/rebuilding relcache entries in various scenarios
 */
extern void RelationForgetRelation(Oid rid);

extern void RelationCacheInvalidateEntry(Oid relationId);

extern void RelationCacheInvalidate(void);

extern void RelationCloseSmgrByOid(Oid relationId);

extern void AtEOXact_RelationCache(bool isCommit);
extern void AtEOSubXact_RelationCache(bool isCommit, SubTransactionId mySubid,
                          SubTransactionId parentSubid);

/*
 * Routines to help manage rebuilding of relcache init files
 */
extern bool RelationIdIsInInitFile(Oid relationId);
extern void RelationCacheInitFilePreInvalidate(void);
extern void RelationCacheInitFilePostInvalidate(void);
extern void RelationCacheInitFileRemove(void);

/* should be used only by relcache.c and catcache.c */
extern bool criticalRelcachesBuilt;

/* should be used only by relcache.c and postinit.c */
extern bool criticalSharedRelcachesBuilt;

#endif   /* RELCACHE_H */