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104 lines
1.9 KiB
C
104 lines
1.9 KiB
C
/*
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* user_locks.c --
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*
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* This loadable module, together with my user-lock.patch applied to the
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* backend, 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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*
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* This software is distributed under the GNU General Public License
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* either version 2, or (at your option) any later version.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "postgres.h"
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#include "miscadmin.h"
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#include "storage/lmgr.h"
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#include "storage/proc.h"
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#include "utils/elog.h"
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#include "user_locks.h"
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int
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user_lock(uint32 id1, uint32 id2, LOCKMODE lockmode)
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{
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LOCKTAG tag;
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memset(&tag, 0, sizeof(LOCKTAG));
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tag.dbId = MyDatabaseId;
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tag.relId = 0;
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tag.objId.blkno = (BlockNumber) id2;
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tag.offnum = (OffsetNumber) (id1 & 0xffff);
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return LockAcquire(USER_LOCKMETHOD, &tag, lockmode);
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}
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int
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user_unlock(uint32 id1, uint32 id2, LOCKMODE lockmode)
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{
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LOCKTAG tag;
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memset(&tag, 0, sizeof(LOCKTAG));
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tag.dbId = MyDatabaseId;
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tag.relId = 0;
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tag.objId.blkno = (BlockNumber) id2;
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tag.offnum = (OffsetNumber) (id1 & 0xffff);
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return LockRelease(USER_LOCKMETHOD, &tag, lockmode);
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}
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int
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user_write_lock(uint32 id1, uint32 id2)
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{
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return user_lock(id1, id2, ExclusiveLock);
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}
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int
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user_write_unlock(uint32 id1, uint32 id2)
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{
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return user_unlock(id1, id2, ExclusiveLock);
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}
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int
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user_write_lock_oid(Oid oid)
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{
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return user_lock(0, oid, ExclusiveLock);
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}
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int
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user_write_unlock_oid(Oid oid)
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{
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return user_unlock(0, oid, ExclusiveLock);
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}
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int
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user_unlock_all()
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{
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PROC *proc;
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SHMEM_OFFSET location;
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ShmemPIDLookup(MyProcPid, &location);
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if (location == INVALID_OFFSET)
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{
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elog(NOTICE, "UserUnlockAll: unable to get proc ptr");
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return -1;
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}
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proc = (PROC *) MAKE_PTR(location);
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return LockReleaseAll(USER_LOCKMETHOD, &proc->lockQueue);
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}
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/* end of file */
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-basic-offset: 4
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* End:
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*/
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