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