mutex.h revision 289624 
1/* $FreeBSD: head/sys/ofed/include/linux/mutex.h 289624 2015-10-20 11:40:04Z hselasky $ */
2/*-
3 * Copyright (c) 2010 Isilon Systems, Inc.
4 * Copyright (c) 2010 iX Systems, Inc.
5 * Copyright (c) 2010 Panasas, Inc.
6 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30#ifndef	_LINUX_MUTEX_H_
31#define	_LINUX_MUTEX_H_
32
33#include <sys/param.h>
34#include <sys/lock.h>
35#include <sys/sx.h>
36
37#include <linux/spinlock.h>
38
39typedef struct mutex {
40	struct sx sx;
41} mutex_t;
42
43#define	mutex_lock(_m)			sx_xlock(&(_m)->sx)
44#define	mutex_lock_nested(_m, _s)	mutex_lock(_m)
45#define	mutex_lock_interruptible(_m)	({ mutex_lock((_m)); 0; })
46#define	mutex_unlock(_m)		sx_xunlock(&(_m)->sx)
47#define	mutex_trylock(_m)		!!sx_try_xlock(&(_m)->sx)
48
49#define DEFINE_MUTEX(lock)						\
50	mutex_t lock;							\
51	SX_SYSINIT_FLAGS(lock, &(lock).sx, "lnxmtx", SX_NOWITNESS)
52
53static inline void
54linux_mutex_init(mutex_t *m)
55{
56
57	memset(&m->sx, 0, sizeof(m->sx));
58	sx_init_flags(&m->sx, "lnxmtx",  SX_NOWITNESS);
59}
60
61#define	mutex_init	linux_mutex_init
62
63#endif	/* _LINUX_MUTEX_H_ */
64