semaphore.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/semaphore.h 289644 2015-10-20 19:08:26Z hselasky $
30 */
31#ifndef _LINUX_SEMAPHORE_H_
32#define _LINUX_SEMAPHORE_H_
33
34#include <sys/param.h>
35#include <sys/lock.h>
36#include <sys/sema.h>
37
38/*
39 * XXX BSD semaphores are disused and slow.  They also do not provide a
40 * sema_wait_sig method.  This must be resolved eventually.
41 */
42struct semaphore {
43	struct sema	sema;
44};
45
46#define	down(_sem)			sema_wait(&(_sem)->sema)
47#define	down_interruptible(_sem)	sema_wait(&(_sem)->sema), 0
48#define	down_trylock(_sem)		!sema_trywait(&(_sem)->sema)
49#define	up(_sem)			sema_post(&(_sem)->sema)
50
51static inline void
52linux_sema_init(struct semaphore *sem, int val)
53{
54
55	memset(&sem->sema, 0, sizeof(sem->sema));
56	sema_init(&sem->sema, val, "lnxsema");
57}
58
59static inline void
60init_MUTEX(struct semaphore *sem)
61{
62
63	memset(&sem->sema, 0, sizeof(sem->sema));
64	sema_init(&sem->sema, 1, "lnxsema");
65}
66
67#define	sema_init	linux_sema_init
68
69#endif /* _LINUX_SEMAPHORE_H_ */
70