mutex.h revision 289644 
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 * $FreeBSD: head/sys/ofed/include/linux/mutex.h 289644 2015-10-20 19:08:26Z hselasky $
30 */
31#ifndef	_LINUX_MUTEX_H_
32#define	_LINUX_MUTEX_H_
33
34#include <sys/param.h>
35#include <sys/lock.h>
36#include <sys/sx.h>
37
38#include <linux/spinlock.h>
39
40typedef struct mutex {
41	struct sx sx;
42} mutex_t;
43
44#define	mutex_lock(_m)			sx_xlock(&(_m)->sx)
45#define	mutex_lock_nested(_m, _s)	mutex_lock(_m)
46#define	mutex_lock_interruptible(_m)	({ mutex_lock((_m)); 0; })
47#define	mutex_unlock(_m)		sx_xunlock(&(_m)->sx)
48#define	mutex_trylock(_m)		!!sx_try_xlock(&(_m)->sx)
49
50#define DEFINE_MUTEX(lock)						\
51	mutex_t lock;							\
52	SX_SYSINIT_FLAGS(lock, &(lock).sx, "lnxmtx", SX_NOWITNESS)
53
54static inline void
55linux_mutex_init(mutex_t *m)
56{
57
58	memset(&m->sx, 0, sizeof(m->sx));
59	sx_init_flags(&m->sx, "lnxmtx",  SX_NOWITNESS);
60}
61
62#define	mutex_init	linux_mutex_init
63
64#endif	/* _LINUX_MUTEX_H_ */
65