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/*-------------------------------------------------------------------------
*
* lmgr.h--
* POSTGRES lock manager definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: lmgr.h,v 1.13 1998/07/13 16:34:56 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LMGR_H
#define LMGR_H
#include <storage/lock.h>
#include <utils/rel.h>
#include <catalog/catname.h>
/*
* This was moved from pladt.h for the new lock manager. Want to obsolete
* all of the old code.
*/
typedef struct LockRelId
{
Oid relId; /* a relation identifier */
Oid dbId; /* a database identifier */
} LockRelId;
typedef struct LockInfoData
{
bool initialized;
LockRelId lockRelId;
TransactionId transactionIdData;
uint16 flags;
} LockInfoData;
typedef LockInfoData *LockInfo;
#define LockInfoIsValid(lockinfo) \
((PointerIsValid(lockinfo)) && ((LockInfo) lockinfo)->initialized)
extern LockRelId VariableRelationLockRelId;
/*
* RelationGetLockRelId --
* Returns "lock" relation identifier for a relation.
*/
/* ----------------
* final condition is a hack to prevent problems during
* VARIABLE relation initialization
* ----------------
*/
#define RelationGetLockRelId(relation) \
( \
AssertMacro(RelationIsValid(relation)), \
(!LockInfoIsValid((LockInfo)(relation)->lockInfo)) ? \
RelationInitLockInfo(relation) \
: \
(void)NULL, \
(strcmp(RelationGetRelationName(relation)->data, \
VariableRelationName) == 0) ? \
VariableRelationLockRelId \
: \
((LockInfo)(relation)->lockInfo)->lockRelId \
)
extern Oid LockRelIdGetRelationId(LockRelId lockRelId);
extern void RelationInitLockInfo(Relation relation);
extern void RelationSetLockForDescriptorOpen(Relation relation);
extern void RelationSetLockForRead(Relation relation);
extern void RelationUnsetLockForRead(Relation relation);
extern void RelationSetLockForWrite(Relation relation);
extern void RelationUnsetLockForWrite(Relation relation);
/* used in vaccum.c */
extern void
RelationSetLockForWritePage(Relation relation,
ItemPointer itemPointer);
/* used in nbtpage.c, hashpage.c */
extern void
RelationSetSingleWLockPage(Relation relation,
ItemPointer itemPointer);
extern void
RelationUnsetSingleWLockPage(Relation relation,
ItemPointer itemPointer);
extern void
RelationSetSingleRLockPage(Relation relation,
ItemPointer itemPointer);
extern void
RelationUnsetSingleRLockPage(Relation relation,
ItemPointer itemPointer);
extern void RelationSetRIntentLock(Relation relation);
extern void RelationUnsetRIntentLock(Relation relation);
extern void RelationSetWIntentLock(Relation relation);
extern void RelationUnsetWIntentLock(Relation relation);
/* single.c */
extern bool SingleLockReln(LockInfo lockinfo, LOCKMODE lockmode, int action);
extern bool
SingleLockPage(LockInfo lockinfo, ItemPointer tidPtr,
LOCKMODE lockmode, int action);
/* proc.c */
extern void InitProcGlobal(IPCKey key);
#endif /* LMGR_H */
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