/usr/include/libspl/synch.h is in libzfslinux-dev 0.6.5.6-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Copyright 2014 Zettabyte Software, LLC. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _LIBSPL_SYNCH_H
#define _LIBSPL_SYNCH_H
#ifndef __sun__
#include <assert.h>
#include <pthread.h>
/*
* Definitions of synchronization types.
*/
#define USYNC_THREAD 0x00 /* private to a process */
#define USYNC_PROCESS 0x01 /* shared by processes */
typedef pthread_rwlock_t rwlock_t;
#define DEFAULTRWLOCK PTHREAD_RWLOCK_INITIALIZER
static inline int
rwlock_init(rwlock_t *rwlp, int type, void *arg)
{
pthread_rwlockattr_t attr;
int err = 0;
VERIFY0(pthread_rwlockattr_init(&attr));
switch (type) {
case USYNC_THREAD:
VERIFY0(pthread_rwlockattr_setpshared(&attr,
PTHREAD_PROCESS_PRIVATE));
break;
case USYNC_PROCESS:
VERIFY0(pthread_rwlockattr_setpshared(&attr,
PTHREAD_PROCESS_SHARED));
break;
default:
VERIFY0(1);
}
err = pthread_rwlock_init(rwlp, &attr);
VERIFY0(pthread_rwlockattr_destroy(&attr));
return (err);
}
#define rwlock_destroy(x) pthread_rwlock_destroy((x))
#define rw_rdlock(x) pthread_rwlock_rdlock((x))
#define rw_wrlock(x) pthread_rwlock_wrlock((x))
#define rw_unlock(x) pthread_rwlock_unlock((x))
#define rw_tryrdlock(x) pthread_rwlock_tryrdlock((x))
#define rw_trywrlock(x) pthread_rwlock_trywrlock((x))
#endif /* __sun__ */
#endif
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