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84 lines
3.4 KiB
C
84 lines
3.4 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) 1996-2011, 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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* src/include/storage/lmgr.h
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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 "lib/stringinfo.h"
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#include "storage/itemptr.h"
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#include "storage/lock.h"
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#include "utils/rel.h"
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extern void RelationInitLockInfo(Relation relation);
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/* Lock a relation */
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extern void LockRelationOid(Oid relid, LOCKMODE lockmode);
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extern bool ConditionalLockRelationOid(Oid relid, LOCKMODE lockmode);
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extern void UnlockRelationId(LockRelId *relid, LOCKMODE lockmode);
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extern void UnlockRelationOid(Oid relid, LOCKMODE lockmode);
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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 LockRelationIdForSession(LockRelId *relid, LOCKMODE lockmode);
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extern void UnlockRelationIdForSession(LockRelId *relid, LOCKMODE lockmode);
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/* Lock a relation for extension */
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extern void LockRelationForExtension(Relation relation, LOCKMODE lockmode);
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extern void UnlockRelationForExtension(Relation relation, LOCKMODE lockmode);
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/* Lock a page (currently only used within 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 a tuple (see heap_lock_tuple before assuming you understand this) */
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extern void LockTuple(Relation relation, ItemPointer tid, LOCKMODE lockmode);
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extern bool ConditionalLockTuple(Relation relation, ItemPointer tid,
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LOCKMODE lockmode);
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extern void UnlockTuple(Relation relation, ItemPointer tid, 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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extern bool ConditionalXactLockTableWait(TransactionId xid);
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/* Lock a VXID (used to wait for a transaction to finish) */
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extern void VirtualXactLockTableInsert(VirtualTransactionId vxid);
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extern void VirtualXactLockTableWait(VirtualTransactionId vxid);
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extern bool ConditionalVirtualXactLockTableWait(VirtualTransactionId vxid);
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/* Lock a general object (other than a relation) of the current database */
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extern void LockDatabaseObject(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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extern void UnlockDatabaseObject(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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/* Lock a shared-across-databases object (other than a relation) */
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extern void LockSharedObject(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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extern void UnlockSharedObject(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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extern void LockSharedObjectForSession(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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extern void UnlockSharedObjectForSession(Oid classid, Oid objid, uint16 objsubid,
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LOCKMODE lockmode);
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/* Describe a locktag for error messages */
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extern void DescribeLockTag(StringInfo buf, const LOCKTAG *tag);
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#endif /* LMGR_H */
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