mutex.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_MUTEX_H_
29#define	_LINUX_MUTEX_H_
30
31#include <sys/param.h>
32#include <sys/lock.h>
33#include <sys/sx.h>
34
35#include <linux/spinlock.h>
36
37typedef struct mutex {
38	struct sx sx;
39} mutex_t;
40
41#define	mutex_lock(_m)			sx_xlock(&(_m)->sx)
42#define	mutex_lock_nested(_m, _s)	mutex_lock(_m)
43#define	mutex_lock_interruptible(_m)	({ mutex_lock((_m)); 0; })
44#define	mutex_unlock(_m)		sx_xunlock(&(_m)->sx)
45#define	mutex_trylock(_m)		!!sx_try_xlock(&(_m)->sx)
46
47#define DEFINE_MUTEX(lock)						\
48	mutex_t lock;							\
49	SX_SYSINIT_FLAGS(lock, &(lock).sx, "lnxmtx", SX_NOWITNESS)
50
51static inline void
52linux_mutex_init(mutex_t *m)
53{
54
55	memset(&m->sx, 0, sizeof(m->sx));
56	sx_init_flags(&m->sx, "lnxmtx",  SX_NOWITNESS);
57}
58
59#define	mutex_init	linux_mutex_init
60
61#endif	/* _LINUX_MUTEX_H_ */
62