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This implements a subset of the LWP rwlock interface by wrapping the
equivalent POSIX thread interface. It is a superset of the features
needed by ztest.
The missing bits are {,_}rw_read_held() and {,_}rw_write_held().
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1970
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Copyright 2014 Zettabyte Software, LLC. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _LIBSPL_SYNCH_H
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#define _LIBSPL_SYNCH_H
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#ifndef __sun__
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#include <assert.h>
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#include <pthread.h>
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/*
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* Definitions of synchronization types.
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*/
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#define USYNC_THREAD 0x00 /* private to a process */
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#define USYNC_PROCESS 0x01 /* shared by processes */
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typedef pthread_rwlock_t rwlock_t;
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#define DEFAULTRWLOCK PTHREAD_RWLOCK_INITIALIZER
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static inline int
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rwlock_init(rwlock_t *rwlp, int type, void *arg)
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{
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pthread_rwlockattr_t attr;
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int err = 0;
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VERIFY0(pthread_rwlockattr_init(&attr));
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switch (type) {
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case USYNC_THREAD:
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VERIFY0(pthread_rwlockattr_setpshared(&attr,
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PTHREAD_PROCESS_PRIVATE));
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break;
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case USYNC_PROCESS:
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VERIFY0(pthread_rwlockattr_setpshared(&attr,
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PTHREAD_PROCESS_SHARED));
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break;
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default:
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VERIFY0(1);
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}
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err = pthread_rwlock_init(rwlp, &attr);
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VERIFY0(pthread_rwlockattr_destroy(&attr));
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return (err);
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}
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#define rwlock_destroy(x) pthread_rwlock_destroy((x))
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#define rw_rdlock(x) pthread_rwlock_rdlock((x))
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#define rw_wrlock(x) pthread_rwlock_wrlock((x))
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#define rw_unlock(x) pthread_rwlock_unlock((x))
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#define rw_tryrdlock(x) pthread_rwlock_tryrdlock((x))
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#define rw_trywrlock(x) pthread_rwlock_trywrlock((x))
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#endif /* __sun__ */
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#endif
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