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
42struct mutex {
43 kmutex_t mtx_lock;
44};
45
46struct lock_class_key {
47};
48
49/* Name collision. Pooh. */
50static inline void
51linux_mutex_init(struct mutex *mutex)
52{
53 mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
54}
55
56/* Lockdep stuff. */
57static 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. */
65static inline void
66linux_mutex_destroy(struct mutex *mutex)
67{
68 mutex_destroy(&mutex->mtx_lock);
69}
70
71static inline void
72mutex_lock(struct mutex *mutex)
73{
74 mutex_enter(&mutex->mtx_lock);
75}
76
77static inline int
78mutex_lock_interruptible(struct mutex *mutex)
79{
80 mutex_enter(&mutex->mtx_lock); /* XXX */
81 return 0;
82}
83
84static inline int
85mutex_trylock(struct mutex *mutex)
86{
87 return mutex_tryenter(&mutex->mtx_lock);
88}
89
90static inline void
91mutex_unlock(struct mutex *mutex)
92{
93 mutex_exit(&mutex->mtx_lock);
94}
95
96static inline bool
97mutex_is_locked(struct mutex *mutex)
98{
99 return mutex_owned(&mutex->mtx_lock);
100}
101
102static inline void
103mutex_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
114static inline void
115mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
116{
117 mutex_lock(mutex);
118}
119
120#endif /* _LINUX_MUTEX_H_ */
121