/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (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 2007 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#ifndef	_SYS_RPRWLOCK_H

#define	_SYS_RPRWLOCK_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/inttypes.h>

#include <sys/list.h>

#include <sys/zfs_context.h>

#include <sys/refcount.h>

#ifdef	__cplusplus

extern "C" {

#endif

typedef struct rprwlock {

	kmutex_t	rw_lock;

	kthread_t	*rw_writer;

	kcondvar_t	rw_cv;

	refcount_t	rw_count;

} rprwlock_t;

void rprw_init(rprwlock_t *rwl);

void rprw_destroy(rprwlock_t *rwl);

void rprw_enter_read(rprwlock_t *rwl, void *tag);

void rprw_enter_write(rprwlock_t *rwl, void *tag);

void rprw_enter(rprwlock_t *rwl, krw_t rw, void *tag);

void rprw_exit(rprwlock_t *rwl, void *tag);

boolean_t rprw_held(rprwlock_t *rwl, krw_t rw);

#define	RPRW_READ_HELD(x)	rprw_held(x, RW_READER)

#define	RPRW_WRITE_HELD(x)	rprw_held(x, RW_WRITER)

#ifdef	__cplusplus

}

#endif

#endif /* _SYS_RPRWLOCK_H */