1 /* $NetBSD: mutex.h,v 1.7 2014/08/23 08:03:33 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_MUTEX_H_ 33 #define _LINUX_MUTEX_H_ 34 35 #include <sys/mutex.h> 36 37 #include <lib/libkern/libkern.h> /* KASSERT */ 38 39 #define __acquires(lock) /* XXX lockdep stuff */ 40 #define __releases(lock) /* XXX lockdep stuff */ 41 42 struct mutex { 43 kmutex_t mtx_lock; 44 }; 45 46 struct lock_class_key { 47 }; 48 49 /* Name collision. Pooh. */ 50 static inline void 51 linux_mutex_init(struct mutex *mutex) 52 { 53 mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE); 54 } 55 56 /* Lockdep stuff. */ 57 static inline void 58 __mutex_init(struct mutex *mutex, const char *name __unused, 59 struct lock_class_key *key __unused) 60 { 61 linux_mutex_init(mutex); 62 } 63 64 /* Another name collision. */ 65 static inline void 66 linux_mutex_destroy(struct mutex *mutex) 67 { 68 mutex_destroy(&mutex->mtx_lock); 69 } 70 71 static inline void 72 mutex_lock(struct mutex *mutex) 73 { 74 mutex_enter(&mutex->mtx_lock); 75 } 76 77 static inline int 78 mutex_lock_interruptible(struct mutex *mutex) 79 { 80 mutex_enter(&mutex->mtx_lock); /* XXX */ 81 return 0; 82 } 83 84 static inline int 85 mutex_trylock(struct mutex *mutex) 86 { 87 return mutex_tryenter(&mutex->mtx_lock); 88 } 89 90 static inline void 91 mutex_unlock(struct mutex *mutex) 92 { 93 mutex_exit(&mutex->mtx_lock); 94 } 95 96 static inline bool 97 mutex_is_locked(struct mutex *mutex) 98 { 99 return mutex_owned(&mutex->mtx_lock); 100 } 101 102 static inline void 103 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already) 104 { 105 106 KASSERT(mutex_is_locked(already)); 107 mutex_lock(mutex); 108 } 109 110 #define lockdep_assert_held(m) do {} while (0) 111 112 #define SINGLE_DEPTH_NESTING 0 113 114 static inline void 115 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused) 116 { 117 mutex_lock(mutex); 118 } 119 120 #endif /* _LINUX_MUTEX_H_ */ 121