mutex.h revision 219820
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 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. 16 * 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. 27 */ 28#ifndef _LINUX_MUTEX_H_ 29#define _LINUX_MUTEX_H_ 30 31#include <sys/param.h> 32#include <sys/lock.h> 33#include <sys/sx.h> 34 35#include <linux/spinlock.h> 36 37typedef struct mutex { 38 struct sx sx; 39} mutex_t; 40 41#define mutex_lock(_m) sx_xlock(&(_m)->sx) 42#define mutex_lock_nested(_m, _s) mutex_lock(_m) 43#define mutex_lock_interruptible(_m) ({ mutex_lock((_m)); 0; }) 44#define mutex_unlock(_m) sx_xunlock(&(_m)->sx) 45#define mutex_trylock(_m) !!sx_try_xlock(&(_m)->sx) 46 47#define DEFINE_MUTEX(lock) \ 48 mutex_t lock; \ 49 SX_SYSINIT_FLAGS(lock, &(lock).sx, "lnxmtx", SX_NOWITNESS) 50 51static inline void 52linux_mutex_init(mutex_t *m) 53{ 54 55 memset(&m->sx, 0, sizeof(m->sx)); 56 sx_init_flags(&m->sx, "lnxmtx", SX_NOWITNESS); 57} 58 59#define mutex_init linux_mutex_init 60 61#endif /* _LINUX_MUTEX_H_ */ 62