65 lines
2.3 KiB
C
65 lines
2.3 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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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/lmgr.h,v 1.45 2004/12/31 22:03:42 pgsql 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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/* These are the valid values of type LOCKMODE: */
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/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
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#define NoLock 0
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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 ShareUpdateExclusiveLock 4 /* VACUUM (non-FULL) */
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#define ShareLock 5 /* CREATE INDEX */
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#define ShareRowExclusiveLock 6 /* like EXCLUSIVE MODE, but allows
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* ROW SHARE */
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#define ExclusiveLock 7 /* blocks ROW SHARE/SELECT...FOR
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* UPDATE */
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#define AccessExclusiveLock 8 /* ALTER TABLE, DROP TABLE, VACUUM
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* FULL, and unqualified LOCK
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* TABLE */
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/*
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* Note: all lock mode numbers must be less than lock.h's MAX_LOCKMODES,
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* so increase that if you want to add more modes.
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*/
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extern void InitLockTable(int maxBackends);
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extern void RelationInitLockInfo(Relation relation);
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/* Lock a relation */
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extern void LockRelation(Relation relation, LOCKMODE lockmode);
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extern bool ConditionalLockRelation(Relation relation, LOCKMODE lockmode);
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extern void UnlockRelation(Relation relation, LOCKMODE lockmode);
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extern void LockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
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extern void UnlockRelationForSession(LockRelId *relid, LOCKMODE lockmode);
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/* Lock a page (mainly used for indexes) */
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extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
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extern bool ConditionalLockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
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extern void UnlockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode);
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/* Lock an XID (used to wait for a transaction to finish) */
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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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#endif /* LMGR_H */
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