1 /* 2 * Copyright (c) 2014-2018 François Tigeot <ftigeot@wolfpond.org> 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 <asm/current.h> 31 #include <linux/list.h> 32 #include <linux/lockdep.h> 33 #include <linux/atomic.h> 34 35 #define mutex_is_locked(lock) (lockinuse(lock)) 36 37 #define mutex_lock(lock) lockmgr(lock, LK_EXCLUSIVE) 38 #define mutex_unlock(lock) lockmgr(lock, LK_RELEASE) 39 40 #define mutex_trylock(lock) lockmgr_try(lock, LK_EXCLUSIVE) 41 42 static inline int 43 mutex_lock_interruptible(struct lock *lock) 44 { 45 if (lockmgr(lock, LK_EXCLUSIVE|LK_SLEEPFAIL|LK_PCATCH)) 46 return -EINTR; 47 48 return 0; 49 } 50 51 #define DEFINE_MUTEX(mutex) \ 52 struct lock mutex; \ 53 LOCK_SYSINIT(mutex, &mutex, "lmutex", LK_CANRECURSE) 54 55 static inline void 56 mutex_destroy(struct lock *mutex) 57 { 58 lockuninit(mutex); 59 } 60 61 #endif /* _LINUX_MUTEX_H_ */ 62