1 /* $NetBSD: mutex.h,v 1.12 2020/02/14 14:34:59 maya 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 #include <asm/processor.h> 40 41 #include <linux/list.h> 42 43 #define __acquires(lock) /* XXX lockdep stuff */ 44 #define __releases(lock) /* XXX lockdep stuff */ 45 #define might_lock(lock) do {} while(0) /* XXX lockdep stuff */ 46 47 struct mutex { 48 kmutex_t mtx_lock; 49 }; 50 51 struct lock_class_key { 52 }; 53 54 /* Name collision. Pooh. */ 55 static inline void 56 linux_mutex_init(struct mutex *mutex) 57 { 58 mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE); 59 } 60 61 /* Lockdep stuff. */ 62 static inline void 63 __mutex_init(struct mutex *mutex, const char *name __unused, 64 struct lock_class_key *key __unused) 65 { 66 linux_mutex_init(mutex); 67 } 68 69 /* Another name collision. */ 70 static inline void 71 linux_mutex_destroy(struct mutex *mutex) 72 { 73 mutex_destroy(&mutex->mtx_lock); 74 } 75 76 static inline void 77 mutex_lock(struct mutex *mutex) 78 { 79 mutex_enter(&mutex->mtx_lock); 80 } 81 82 static inline int 83 mutex_lock_interruptible(struct mutex *mutex) 84 { 85 mutex_enter(&mutex->mtx_lock); /* XXX */ 86 return 0; 87 } 88 89 static inline int 90 mutex_trylock(struct mutex *mutex) 91 { 92 return mutex_tryenter(&mutex->mtx_lock); 93 } 94 95 static inline void 96 mutex_unlock(struct mutex *mutex) 97 { 98 mutex_exit(&mutex->mtx_lock); 99 } 100 101 static inline bool 102 mutex_is_locked(struct mutex *mutex) 103 { 104 return mutex_owned(&mutex->mtx_lock); 105 } 106 107 static inline void 108 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already) 109 { 110 111 KASSERT(mutex_is_locked(already)); 112 mutex_lock(mutex); 113 } 114 115 #define __lockdep_used __unused 116 #define lockdep_assert_held(m) do {} while (0) 117 #define lockdep_is_held(m) 1 118 119 #define SINGLE_DEPTH_NESTING 0 120 121 static inline void 122 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused) 123 { 124 mutex_lock(mutex); 125 } 126 127 #endif /* _LINUX_MUTEX_H_ */ 128