rwlock.h revision 270710 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29#ifndef	_LINUX_RWLOCK_H_
30#define	_LINUX_RWLOCK_H_
31
32#include <sys/lock.h>
33#include <sys/rwlock.h>
34
35typedef struct {
36	struct rwlock rw;
37} rwlock_t;
38
39#define	read_lock(_l)		rw_rlock(&(_l)->rw)
40#define	write_lock(_l)		rw_wlock(&(_l)->rw)
41#define	read_unlock(_l)		rw_runlock(&(_l)->rw)
42#define	write_unlock(_l)	rw_wunlock(&(_l)->rw)
43#define	read_lock_irq(lock)	read_lock((lock))
44#define	read_unlock_irq(lock)	read_unlock((lock))
45#define	write_lock_irq(lock)	write_lock((lock))
46#define	write_unlock_irq(lock)	write_unlock((lock))
47#define	read_lock_irqsave(lock, flags)   				\
48    do {(flags) = 0; read_lock(lock); } while (0)
49#define	write_lock_irqsave(lock, flags)   				\
50    do {(flags) = 0; write_lock(lock); } while (0)
51#define	read_unlock_irqrestore(lock, flags)				\
52    do { read_unlock(lock); } while (0)
53#define	write_unlock_irqrestore(lock, flags)				\
54    do { write_unlock(lock); } while (0)
55
56static inline void
57rwlock_init(rwlock_t *lock)
58{
59
60	memset(&lock->rw, 0, sizeof(lock->rw));
61	rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS);
62}
63
64#endif	/* _LINUX_RWLOCK_H_ */
65