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mutex.h revision 1.6 
      1 /*	$NetBSD: mutex.h,v 1.6 2014/08/06 15:01:33 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 struct mutex {
     40 	kmutex_t mtx_lock;
     41 };
     42 
     43 struct lock_class_key {
     44 };
     45 
     46 /* Name collision.  Pooh.  */
     47 static inline void
     48 linux_mutex_init(struct mutex *mutex)
     49 {
     50 	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
     51 }
     52 
     53 /* Lockdep stuff.  */
     54 static inline void
     55 __mutex_init(struct mutex *mutex, const char *name __unused,
     56     struct lock_class_key *key __unused)
     57 {
     58 	linux_mutex_init(mutex);
     59 }
     60 
     61 /* Another name collision.  */
     62 static inline void
     63 linux_mutex_destroy(struct mutex *mutex)
     64 {
     65 	mutex_destroy(&mutex->mtx_lock);
     66 }
     67 
     68 static inline void
     69 mutex_lock(struct mutex *mutex)
     70 {
     71 	mutex_enter(&mutex->mtx_lock);
     72 }
     73 
     74 static inline int
     75 mutex_lock_interruptible(struct mutex *mutex)
     76 {
     77 	mutex_enter(&mutex->mtx_lock); /* XXX */
     78 	return 0;
     79 }
     80 
     81 static inline int
     82 mutex_trylock(struct mutex *mutex)
     83 {
     84 	return mutex_tryenter(&mutex->mtx_lock);
     85 }
     86 
     87 static inline void
     88 mutex_unlock(struct mutex *mutex)
     89 {
     90 	mutex_exit(&mutex->mtx_lock);
     91 }
     92 
     93 static inline bool
     94 mutex_is_locked(struct mutex *mutex)
     95 {
     96 	return mutex_owned(&mutex->mtx_lock);
     97 }
     98 
     99 static inline void
    100 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
    101 {
    102 
    103 	KASSERT(mutex_is_locked(already));
    104 	mutex_lock(mutex);
    105 }
    106 
    107 #define	lockdep_assert_held(m)	do {} while (0)
    108 
    109 #define	SINGLE_DEPTH_NESTING	0
    110 
    111 static inline void
    112 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
    113 {
    114 	mutex_lock(mutex);
    115 }
    116 
    117 #endif  /* _LINUX_MUTEX_H_ */
    118