mutex.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_MUTEX_H_
30#define	_LINUX_MUTEX_H_
31
32#include <sys/param.h>
33#include <sys/lock.h>
34#include <sys/sx.h>
35
36#include <linux/spinlock.h>
37
38typedef struct mutex {
39	struct sx sx;
40} mutex_t;
41
42#define	mutex_lock(_m)			sx_xlock(&(_m)->sx)
43#define	mutex_lock_nested(_m, _s)	mutex_lock(_m)
44#define	mutex_lock_interruptible(_m)	({ mutex_lock((_m)); 0; })
45#define	mutex_unlock(_m)		sx_xunlock(&(_m)->sx)
46#define	mutex_trylock(_m)		!!sx_try_xlock(&(_m)->sx)
47
48#define DEFINE_MUTEX(lock)						\
49	mutex_t lock;							\
50	SX_SYSINIT_FLAGS(lock, &(lock).sx, "lnxmtx", SX_NOWITNESS)
51
52static inline void
53linux_mutex_init(mutex_t *m)
54{
55
56	memset(&m->sx, 0, sizeof(m->sx));
57	sx_init_flags(&m->sx, "lnxmtx",  SX_NOWITNESS);
58}
59
60#define	mutex_init	linux_mutex_init
61
62#endif	/* _LINUX_MUTEX_H_ */
63