semaphore.h revision 289624 
1/* $FreeBSD: head/sys/ofed/include/linux/semaphore.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_SEMAPHORE_H_
31#define _LINUX_SEMAPHORE_H_
32
33#include <sys/param.h>
34#include <sys/lock.h>
35#include <sys/sema.h>
36
37/*
38 * XXX BSD semaphores are disused and slow.  They also do not provide a
39 * sema_wait_sig method.  This must be resolved eventually.
40 */
41struct semaphore {
42	struct sema	sema;
43};
44
45#define	down(_sem)			sema_wait(&(_sem)->sema)
46#define	down_interruptible(_sem)	sema_wait(&(_sem)->sema), 0
47#define	down_trylock(_sem)		!sema_trywait(&(_sem)->sema)
48#define	up(_sem)			sema_post(&(_sem)->sema)
49
50static inline void
51linux_sema_init(struct semaphore *sem, int val)
52{
53
54	memset(&sem->sema, 0, sizeof(sem->sema));
55	sema_init(&sem->sema, val, "lnxsema");
56}
57
58static inline void
59init_MUTEX(struct semaphore *sem)
60{
61
62	memset(&sem->sema, 0, sizeof(sem->sema));
63	sema_init(&sem->sema, 1, "lnxsema");
64}
65
66#define	sema_init	linux_sema_init
67
68#endif /* _LINUX_SEMAPHORE_H_ */
69