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/*-------------------------------------------------------------------------
*
* multilev.h
* multi level lock table consts/defs for single.c and multi.c and their
* clients
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: multilev.h,v 1.18 2001/01/24 19:43:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef MULTILEV_H
#define MULTILEV_H
#include "storage/lmgr.h"
#ifdef LowLevelLocking
/* DML locks */
#define RowShareLock 1 /* SELECT FOR UPDATE */
#define RowExclusiveLock 2 /* INSERT, UPDATE, DELETE */
#define ShareLock 3
#define ShareRowExclusiveLock 4
#define ExclusiveLock 5
/* DDL locks */
#define ObjShareLock 6
#define ObjExclusiveLock 7
/* Special locks */
#define ExtendLock 8
#else
#define READ_LOCK 2
#define WRITE_LOCK 1
/* any time a small granularity READ/WRITE lock is set.
* Higher granularity READ_INTENT/WRITE_INTENT locks must
* also be set. A read intent lock is has value READ+INTENT.
* in this implementation.
*/
#define NO_LOCK 0
#define INTENT 2
#define READ_INTENT (READ_LOCK+INTENT)
#define WRITE_INTENT (WRITE_LOCK+INTENT)
#define EXTEND_LOCK 5
#endif /* !LowLevelLocking */
#define SHORT_TERM 1
#define LONG_TERM 2
#define UNLOCK 0
#define N_LEVELS 3
#define RELN_LEVEL 0
#define PAGE_LEVEL 1
#define TUPLE_LEVEL 2
typedef int PG_LOCK_LEVEL;
/* multi.c */
extern LOCKMETHOD MultiTableId;
#ifdef NOT_USED
extern LOCKMETHOD ShortTermTableId;
#endif
/*
* function prototypes
*/
extern LOCKMETHOD InitMultiLevelLocks(void);
extern bool MultiLockReln(LockInfo lockinfo, LOCKMODE lockmode);
extern bool MultiLockPage(LockInfo lockinfo, ItemPointer tidPtr, LOCKMODE lockmode);
extern bool MultiReleaseReln(LockInfo lockinfo, LOCKMODE lockmode);
#endif /* MULTILEV_H */
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