1 /* $NetBSD: mutex.h,v 1.6 2014/08/06 15:01:33 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 struct mutex { 40 kmutex_t mtx_lock; 41 }; 42 43 struct lock_class_key { 44 }; 45 46 /* Name collision. Pooh. */ 47 static inline void 48 linux_mutex_init(struct mutex *mutex) 49 { 50 mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE); 51 } 52 53 /* Lockdep stuff. */ 54 static inline void 55 __mutex_init(struct mutex *mutex, const char *name __unused, 56 struct lock_class_key *key __unused) 57 { 58 linux_mutex_init(mutex); 59 } 60 61 /* Another name collision. */ 62 static inline void 63 linux_mutex_destroy(struct mutex *mutex) 64 { 65 mutex_destroy(&mutex->mtx_lock); 66 } 67 68 static inline void 69 mutex_lock(struct mutex *mutex) 70 { 71 mutex_enter(&mutex->mtx_lock); 72 } 73 74 static inline int 75 mutex_lock_interruptible(struct mutex *mutex) 76 { 77 mutex_enter(&mutex->mtx_lock); /* XXX */ 78 return 0; 79 } 80 81 static inline int 82 mutex_trylock(struct mutex *mutex) 83 { 84 return mutex_tryenter(&mutex->mtx_lock); 85 } 86 87 static inline void 88 mutex_unlock(struct mutex *mutex) 89 { 90 mutex_exit(&mutex->mtx_lock); 91 } 92 93 static inline bool 94 mutex_is_locked(struct mutex *mutex) 95 { 96 return mutex_owned(&mutex->mtx_lock); 97 } 98 99 static inline void 100 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already) 101 { 102 103 KASSERT(mutex_is_locked(already)); 104 mutex_lock(mutex); 105 } 106 107 #define lockdep_assert_held(m) do {} while (0) 108 109 #define SINGLE_DEPTH_NESTING 0 110 111 static inline void 112 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused) 113 { 114 mutex_lock(mutex); 115 } 116 117 #endif /* _LINUX_MUTEX_H_ */ 118