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mutex.h revision 1.4 
      1 /*	$NetBSD: mutex.h,v 1.4 2014/07/16 20:59:58 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 /* Name collision.  Pooh.  */
     44 static inline void
     45 linux_mutex_init(struct mutex *mutex)
     46 {
     47 	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
     48 }
     49 
     50 /* Another name collision.  */
     51 static inline void
     52 linux_mutex_destroy(struct mutex *mutex)
     53 {
     54 	mutex_destroy(&mutex->mtx_lock);
     55 }
     56 
     57 static inline void
     58 mutex_lock(struct mutex *mutex)
     59 {
     60 	mutex_enter(&mutex->mtx_lock);
     61 }
     62 
     63 static inline int
     64 mutex_lock_interruptible(struct mutex *mutex)
     65 {
     66 	mutex_enter(&mutex->mtx_lock); /* XXX */
     67 	return 0;
     68 }
     69 
     70 static inline int
     71 mutex_trylock(struct mutex *mutex)
     72 {
     73 	return mutex_tryenter(&mutex->mtx_lock);
     74 }
     75 
     76 static inline void
     77 mutex_unlock(struct mutex *mutex)
     78 {
     79 	mutex_exit(&mutex->mtx_lock);
     80 }
     81 
     82 static inline bool
     83 mutex_is_locked(struct mutex *mutex)
     84 {
     85 	return mutex_owned(&mutex->mtx_lock);
     86 }
     87 
     88 static inline void
     89 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
     90 {
     91 
     92 	KASSERT(mutex_is_locked(already));
     93 	mutex_lock(mutex);
     94 }
     95 
     96 #define	lockdep_assert_held(m)	do {} while (0)
     97 
     98 #endif  /* _LINUX_MUTEX_H_ */
     99