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/*-------------------------------------------------------------------------
*
* lmgr.h
* POSTGRES lock manager definitions.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: lmgr.h,v 1.30 2001/03/22 04:01:07 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LMGR_H
#define LMGR_H
#include "storage/lock.h"
#include "utils/rel.h"
/* These are the valid values of type LOCKMODE: */
/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
#define NoLock 0
#define AccessShareLock 1 /* SELECT */
#define RowShareLock 2 /* SELECT FOR UPDATE */
#define RowExclusiveLock 3 /* INSERT, UPDATE, DELETE */
#define ShareLock 4 /* CREATE INDEX */
#define ShareRowExclusiveLock 5 /* like EXCLUSIVE MODE, allows
* SHARE ROW */
#define ExclusiveLock 6 /* blocks ROW SHARE/SELECT...FOR
* UPDATE */
#define AccessExclusiveLock 7 /* ALTER TABLE, DROP TABLE,
* VACUUM, and unqualified LOCK
* TABLE */
extern LOCKMETHOD LockTableId;
extern LOCKMETHOD InitLockTable(int maxBackends);
extern void RelationInitLockInfo(Relation relation);
/* Lock a relation */
extern void LockRelation(Relation relation, LOCKMODE lockmode);
extern void UnlockRelation(Relation relation, LOCKMODE lockmode);
extern void LockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
extern void UnlockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
/* Lock a page (mainly used for indices) */
extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
extern void UnlockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
/* Lock an XID (used to wait for a transaction to finish) */
extern void XactLockTableInsert(TransactionId xid);
extern void XactLockTableWait(TransactionId xid);
#endif /* LMGR_H */
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