rprwlock.h revision 91ebeef555ce7f899b6270a3c2df47b51f7ad59a
/*
* 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 */