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 _LINUXKPI_LINUX_SEMAPHORE_H_
30 #define _LINUXKPI_LINUX_SEMAPHORE_H_
31
32 #include <sys/param.h>
33 #include <sys/lock.h>
34 #include <sys/sema.h>
35 #include <sys/libkern.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 */
41 struct 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
50 static inline void
linux_sema_init(struct semaphore * sem,int val)51 linux_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
58 static inline void
init_MUTEX(struct semaphore * sem)59 init_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(__VA_ARGS__)
67
68 #endif /* _LINUXKPI_LINUX_SEMAPHORE_H_ */
69