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mutex.h revision 1.8 
      1 /*	$NetBSD: mutex.h,v 1.8 2018/08/27 06:06:41 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 
     43 struct mutex {
     44 	kmutex_t mtx_lock;
     45 };
     46 
     47 struct lock_class_key {
     48 };
     49 
     50 /* Name collision.  Pooh.  */
     51 static inline void
     52 linux_mutex_init(struct mutex *mutex)
     53 {
     54 	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
     55 }
     56 
     57 /* Lockdep stuff.  */
     58 static inline void
     59 __mutex_init(struct mutex *mutex, const char *name __unused,
     60     struct lock_class_key *key __unused)
     61 {
     62 	linux_mutex_init(mutex);
     63 }
     64 
     65 /* Another name collision.  */
     66 static inline void
     67 linux_mutex_destroy(struct mutex *mutex)
     68 {
     69 	mutex_destroy(&mutex->mtx_lock);
     70 }
     71 
     72 static inline void
     73 mutex_lock(struct mutex *mutex)
     74 {
     75 	mutex_enter(&mutex->mtx_lock);
     76 }
     77 
     78 static inline int
     79 mutex_lock_interruptible(struct mutex *mutex)
     80 {
     81 	mutex_enter(&mutex->mtx_lock); /* XXX */
     82 	return 0;
     83 }
     84 
     85 static inline int
     86 mutex_trylock(struct mutex *mutex)
     87 {
     88 	return mutex_tryenter(&mutex->mtx_lock);
     89 }
     90 
     91 static inline void
     92 mutex_unlock(struct mutex *mutex)
     93 {
     94 	mutex_exit(&mutex->mtx_lock);
     95 }
     96 
     97 static inline bool
     98 mutex_is_locked(struct mutex *mutex)
     99 {
    100 	return mutex_owned(&mutex->mtx_lock);
    101 }
    102 
    103 static inline void
    104 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
    105 {
    106 
    107 	KASSERT(mutex_is_locked(already));
    108 	mutex_lock(mutex);
    109 }
    110 
    111 #define	lockdep_assert_held(m)	do {} while (0)
    112 
    113 #define	SINGLE_DEPTH_NESTING	0
    114 
    115 static inline void
    116 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
    117 {
    118 	mutex_lock(mutex);
    119 }
    120 
    121 #endif  /* _LINUX_MUTEX_H_ */
    122