1 /* 2 * Copyright (c) 2014-2015 François Tigeot 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_MUTEX_H_ 28 #define _LINUX_MUTEX_H_ 29 30 #include <sys/lock.h> 31 32 #define mutex_is_locked(lock) (lockcount(lock) != 0) 33 34 #define mutex_lock(lock) lockmgr(lock, LK_EXCLUSIVE) 35 #define mutex_unlock(lock) lockmgr(lock, LK_RELEASE) 36 37 /* NOTE: mutex_trylock() returns non-zero on success */ 38 #define mutex_trylock(lock) (!lockmgr(lock, LK_EXCLUSIVE|LK_NOWAIT)) 39 40 static inline int 41 mutex_lock_interruptible(struct lock *lock) 42 { 43 if (lockmgr(lock, LK_EXCLUSIVE|LK_SLEEPFAIL|LK_PCATCH)) 44 return -EINTR; 45 46 return 0; 47 } 48 49 #define DEFINE_MUTEX(mutex) \ 50 struct lock mutex; \ 51 LOCK_SYSINIT(mutex, &mutex, "lmutex", LK_CANRECURSE) 52 53 #endif /* _LINUX_MUTEX_H_ */ 54