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eec4c7366f
Here is a tar file the new directories, which substitute the old ones in contrib. Please remove the old directories array, datetime, miscutil, string and userlock before unpacking the tar file in contrib. Note that as the modules are now installed in lib/modules I install all my sql code in lib/sql. In my opinion also the other contributors should follow these rules.
107 lines
2.1 KiB
C
107 lines
2.1 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) 1998, Massimo Dal Zotto <dz@cs.unitn.it>
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*
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* This file 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/lock.h"
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#include "storage/proc.h"
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#include "storage/multilev.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(unsigned int id1, unsigned int 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.tupleId.ip_blkid.bi_hi = id2 >> 16;
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tag.tupleId.ip_blkid.bi_lo = id2 & 0xffff;
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tag.tupleId.ip_posid = (unsigned short) (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(unsigned int id1, unsigned int 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.tupleId.ip_blkid.bi_hi = id2 >> 16;
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tag.tupleId.ip_blkid.bi_lo = id2 & 0xffff;
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tag.tupleId.ip_posid = (unsigned short) (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(unsigned int id1, unsigned int id2)
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{
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return user_lock(id1, id2, WRITE_LOCK);
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}
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int
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user_write_unlock(unsigned int id1, unsigned int id2)
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{
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return user_unlock(id1, id2, WRITE_LOCK);
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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, WRITE_LOCK);
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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, WRITE_LOCK);
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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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