1 /* $NetBSD: mutex.h,v 1.11 2018/08/27 07:34:03 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 #include <linux/list.h> 39 40 #define __acquires(lock) /* XXX lockdep stuff */ 41 #define __releases(lock) /* XXX lockdep stuff */ 42 #define might_lock(lock) do {} while(0) /* XXX lockdep stuff */ 43 44 struct mutex { 45 kmutex_t mtx_lock; 46 }; 47 48 struct lock_class_key { 49 }; 50 51 /* Name collision. Pooh. */ 52 static inline void 53 linux_mutex_init(struct mutex *mutex) 54 { 55 mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE); 56 } 57 58 /* Lockdep stuff. */ 59 static inline void 60 __mutex_init(struct mutex *mutex, const char *name __unused, 61 struct lock_class_key *key __unused) 62 { 63 linux_mutex_init(mutex); 64 } 65 66 /* Another name collision. */ 67 static inline void 68 linux_mutex_destroy(struct mutex *mutex) 69 { 70 mutex_destroy(&mutex->mtx_lock); 71 } 72 73 static inline void 74 mutex_lock(struct mutex *mutex) 75 { 76 mutex_enter(&mutex->mtx_lock); 77 } 78 79 static inline int 80 mutex_lock_interruptible(struct mutex *mutex) 81 { 82 mutex_enter(&mutex->mtx_lock); /* XXX */ 83 return 0; 84 } 85 86 static inline int 87 mutex_trylock(struct mutex *mutex) 88 { 89 return mutex_tryenter(&mutex->mtx_lock); 90 } 91 92 static inline void 93 mutex_unlock(struct mutex *mutex) 94 { 95 mutex_exit(&mutex->mtx_lock); 96 } 97 98 static inline bool 99 mutex_is_locked(struct mutex *mutex) 100 { 101 return mutex_owned(&mutex->mtx_lock); 102 } 103 104 static inline void 105 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already) 106 { 107 108 KASSERT(mutex_is_locked(already)); 109 mutex_lock(mutex); 110 } 111 112 #define __lockdep_used __unused 113 #define lockdep_assert_held(m) do {} while (0) 114 #define lockdep_is_held(m) 1 115 116 #define SINGLE_DEPTH_NESTING 0 117 118 static inline void 119 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused) 120 { 121 mutex_lock(mutex); 122 } 123 124 #endif /* _LINUX_MUTEX_H_ */ 125