rwlock.h revision 219820 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef	_LINUX_RWLOCK_H_
29#define	_LINUX_RWLOCK_H_
30
31#include <sys/lock.h>
32#include <sys/rwlock.h>
33
34typedef struct {
35	struct rwlock rw;
36} rwlock_t;
37
38#define	read_lock(_l)		rw_rlock(&(_l)->rw)
39#define	write_lock(_l)		rw_wlock(&(_l)->rw)
40#define	read_unlock(_l)		rw_runlock(&(_l)->rw)
41#define	write_unlock(_l)	rw_wunlock(&(_l)->rw)
42#define	read_lock_irq(lock)	read_lock((lock))
43#define	read_unlock_irq(lock)	read_unlock((lock))
44#define	write_lock_irq(lock)	write_lock((lock))
45#define	write_unlock_irq(lock)	write_unlock((lock))
46#define	read_lock_irqsave(lock, flags)   				\
47    do {(flags) = 0; read_lock(lock); } while (0)
48#define	write_lock_irqsave(lock, flags)   				\
49    do {(flags) = 0; write_lock(lock); } while (0)
50#define	read_unlock_irqrestore(lock, flags)				\
51    do { read_unlock(lock); } while (0)
52#define	write_unlock_irqrestore(lock, flags)				\
53    do { write_unlock(lock); } while (0)
54
55static inline void
56rwlock_init(rwlock_t *lock)
57{
58
59	memset(&lock->rw, 0, sizeof(lock->rw));
60	rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS);
61}
62
63#endif	/* _LINUX_RWLOCK_H_ */
64