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 * $FreeBSD$ 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 #include <sys/libkern.h> 38 39 /* 40 * XXX BSD semaphores are disused and slow. They also do not provide a 41 * sema_wait_sig method. This must be resolved eventually. 42 */ 43 struct semaphore { 44 struct sema sema; 45 }; 46 47 #define down(_sem) sema_wait(&(_sem)->sema) 48 #define down_interruptible(_sem) sema_wait(&(_sem)->sema), 0 49 #define down_trylock(_sem) !sema_trywait(&(_sem)->sema) 50 #define up(_sem) sema_post(&(_sem)->sema) 51 52 static inline void 53 linux_sema_init(struct semaphore *sem, int val) 54 { 55 56 memset(&sem->sema, 0, sizeof(sem->sema)); 57 sema_init(&sem->sema, val, "lnxsema"); 58 } 59 60 static inline void 61 init_MUTEX(struct semaphore *sem) 62 { 63 64 memset(&sem->sema, 0, sizeof(sem->sema)); 65 sema_init(&sem->sema, 1, "lnxsema"); 66 } 67 68 #define sema_init linux_sema_init 69 70 #endif /* _LINUX_SEMAPHORE_H_ */ 71