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/*------------------------------------------------------------------------- * * lmgr.h * POSTGRES lock manager definitions. * * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/lmgr.h * *------------------------------------------------------------------------- */ #ifndef LMGR_H #define LMGR_H #include "lib/stringinfo.h" #include "storage/itemptr.h" #include "storage/lock.h" #include "utils/rel.h" extern void RelationInitLockInfo(Relation relation); /* Lock a relation */ extern void LockRelationOid(Oid relid, LOCKMODE lockmode); extern bool ConditionalLockRelationOid(Oid relid, LOCKMODE lockmode); extern void UnlockRelationId(LockRelId *relid, LOCKMODE lockmode); extern void UnlockRelationOid(Oid relid, LOCKMODE lockmode); extern void LockRelation(Relation relation, LOCKMODE lockmode); extern bool ConditionalLockRelation(Relation relation, LOCKMODE lockmode); extern void UnlockRelation(Relation relation, LOCKMODE lockmode); extern bool LockHasWaitersRelation(Relation relation, LOCKMODE lockmode); extern void LockRelationIdForSession(LockRelId *relid, LOCKMODE lockmode); extern void UnlockRelationIdForSession(LockRelId *relid, LOCKMODE lockmode); /* Lock a relation for extension */ extern void LockRelationForExtension(Relation relation, LOCKMODE lockmode); extern void UnlockRelationForExtension(Relation relation, LOCKMODE lockmode); /* Lock a page (currently only used within indexes) */ extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode); extern bool ConditionalLockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode); extern void UnlockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode); /* Lock a tuple (see heap_lock_tuple before assuming you understand this) */ extern void LockTuple(Relation relation, ItemPointer tid, LOCKMODE lockmode); extern bool ConditionalLockTuple(Relation relation, ItemPointer tid, LOCKMODE lockmode); extern void UnlockTuple(Relation relation, ItemPointer tid, LOCKMODE lockmode); /* Lock an XID (used to wait for a transaction to finish) */ extern void XactLockTableInsert(TransactionId xid); extern void XactLockTableDelete(TransactionId xid); extern void XactLockTableWait(TransactionId xid); extern bool ConditionalXactLockTableWait(TransactionId xid); /* Lock a general object (other than a relation) of the current database */ extern void LockDatabaseObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); extern void UnlockDatabaseObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); /* Lock a shared-across-databases object (other than a relation) */ extern void LockSharedObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); extern void UnlockSharedObject(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); extern void LockSharedObjectForSession(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); extern void UnlockSharedObjectForSession(Oid classid, Oid objid, uint16 objsubid, LOCKMODE lockmode); /* Describe a locktag for error messages */ extern void DescribeLockTag(StringInfo buf, const LOCKTAG *tag); #endif /* LMGR_H */