2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef _LINUX_SEMAPHORE_H_
29 #define _LINUX_SEMAPHORE_H_
31 #include <sys/param.h>
36 * XXX BSD semaphores are disused and slow. They also do not provide a
37 * sema_wait_sig method. This must be resolved eventually.
43 #define down(_sem) sema_wait(&(_sem)->sema)
44 #define down_interruptible(_sem) sema_wait(&(_sem)->sema), 0
45 #define down_trylock(_sem) !sema_trywait(&(_sem)->sema)
46 #define up(_sem) sema_post(&(_sem)->sema)
49 linux_sema_init(struct semaphore *sem, int val)
52 memset(&sem->sema, 0, sizeof(sem->sema));
53 sema_init(&sem->sema, val, "lnxsema");
57 init_MUTEX(struct semaphore *sem)
60 memset(&sem->sema, 0, sizeof(sem->sema));
61 sema_init(&sem->sema, 1, "lnxsema");
64 #define sema_init linux_sema_init
66 #endif /* _LINUX_SEMAPHORE_H_ */