| 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 | |