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65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* lmgr.h
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* POSTGRES lock manager 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: lmgr.h,v 1.20 1999/05/25 22:43:26 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LMGR_H
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#define LMGR_H
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#include <storage/lock.h>
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#include <utils/rel.h>
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#include <catalog/catname.h>
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#define AccessShareLock 1 /* SELECT */
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#define RowShareLock 2 /* SELECT FOR UPDATE */
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#define RowExclusiveLock 3 /* INSERT, UPDATE, DELETE */
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#define ShareLock 4
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#define ShareRowExclusiveLock 5
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#define ExclusiveLock 6
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#define AccessExclusiveLock 7
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extern LOCKMETHOD LockTableId;
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typedef struct LockRelId
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{
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Oid relId; /* a relation identifier */
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Oid dbId; /* a database identifier */
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} LockRelId;
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typedef struct LockInfoData
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{
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LockRelId lockRelId;
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} LockInfoData;
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typedef LockInfoData *LockInfo;
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#define LockInfoIsValid(lockinfo) PointerIsValid(lockinfo)
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extern LOCKMETHOD InitLockTable(void);
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extern void RelationInitLockInfo(Relation relation);
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extern void LockRelation(Relation relation, LOCKMODE lockmode);
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extern void UnlockRelation(Relation relation, LOCKMODE lockmode);
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/* this is for indices */
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extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
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extern void UnlockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
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/* and this is for transactions */
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extern void XactLockTableInsert(TransactionId xid);
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extern void XactLockTableDelete(TransactionId xid);
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extern void XactLockTableWait(TransactionId xid);
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/* proc.c */
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extern void InitProcGlobal(IPCKey key, int maxBackends);
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#endif /* LMGR_H */
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