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191b13aaca
Also, remove the rather useless return value of LockReleaseAll. Change response to detection of corruption in the shared lock tables to PANIC, since that is the only way of cleaning up fully. Originally an idea of Heikki Linnakangas, variously hacked on by Alvaro Herrera and Tom Lane.
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/*
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* user_locks.c --
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*
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* This loadable module provides support for user-level long-term
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* 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 "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 "user_locks.h"
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#define SET_LOCKTAG_USERLOCK(locktag,id1,id2) \
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((locktag).locktag_field1 = MyDatabaseId, \
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(locktag).locktag_field2 = (id1), \
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(locktag).locktag_field3 = (id2), \
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(locktag).locktag_field4 = 0, \
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(locktag).locktag_type = LOCKTAG_USERLOCK)
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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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SET_LOCKTAG_USERLOCK(tag, id1, id2);
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return LockAcquire(USER_LOCKMETHOD, &tag, InvalidTransactionId,
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lockmode, true);
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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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SET_LOCKTAG_USERLOCK(tag, id1, id2);
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return LockRelease(USER_LOCKMETHOD, &tag, InvalidTransactionId, 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(void)
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{
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LockReleaseAll(USER_LOCKMETHOD, true);
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return true;
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}
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