postgresql/contrib/userlock/user_locks.c

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/*
* user_locks.c --
*
* This loadable module provides support for user-level long-term
* cooperative locks.
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*
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* Copyright (C) 1999, Massimo Dal Zotto <dz@cs.unitn.it>
*
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* This software is distributed under the GNU General Public License
* either version 2, or (at your option) any later version.
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*/
#include "postgres.h"
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#include "miscadmin.h"
#include "storage/lmgr.h"
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#include "storage/proc.h"
#include "user_locks.h"
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int
user_lock(uint32 id1, uint32 id2, LOCKMODE lockmode)
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{
LOCKTAG tag;
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memset(&tag, 0, sizeof(LOCKTAG));
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tag.dbId = MyDatabaseId;
tag.relId = 0;
tag.objId.blkno = (BlockNumber) id2;
tag.offnum = (OffsetNumber) (id1 & 0xffff);
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return LockAcquire(USER_LOCKMETHOD, &tag, InvalidTransactionId,
lockmode, true);
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}
int
user_unlock(uint32 id1, uint32 id2, LOCKMODE lockmode)
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{
LOCKTAG tag;
memset(&tag, 0, sizeof(LOCKTAG));
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tag.dbId = MyDatabaseId;
tag.relId = 0;
tag.objId.blkno = (BlockNumber) id2;
tag.offnum = (OffsetNumber) (id1 & 0xffff);
return LockRelease(USER_LOCKMETHOD, &tag, InvalidTransactionId, lockmode);
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}
int
user_write_lock(uint32 id1, uint32 id2)
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{
return user_lock(id1, id2, ExclusiveLock);
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}
int
user_write_unlock(uint32 id1, uint32 id2)
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{
return user_unlock(id1, id2, ExclusiveLock);
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}
int
user_write_lock_oid(Oid oid)
{
return user_lock(0, oid, ExclusiveLock);
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}
int
user_write_unlock_oid(Oid oid)
{
return user_unlock(0, oid, ExclusiveLock);
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}
int
user_unlock_all(void)
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{
return LockReleaseAll(USER_LOCKMETHOD, true);
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}
/* end of file */
/*
* Local Variables:
* tab-width: 4
* c-indent-level: 4
* c-basic-offset: 4
* End:
*/