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mutex.h revision 1.12 
      1 /*	$NetBSD: mutex.h,v 1.12 2020/02/14 14:34:59 maya 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 #include <asm/processor.h>
     40 
     41 #include <linux/list.h>
     42 
     43 #define	__acquires(lock)			/* XXX lockdep stuff */
     44 #define	__releases(lock)			/* XXX lockdep stuff */
     45 #define might_lock(lock) do {} while(0) 	/* XXX lockdep stuff */
     46 
     47 struct mutex {
     48 	kmutex_t mtx_lock;
     49 };
     50 
     51 struct lock_class_key {
     52 };
     53 
     54 /* Name collision.  Pooh.  */
     55 static inline void
     56 linux_mutex_init(struct mutex *mutex)
     57 {
     58 	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
     59 }
     60 
     61 /* Lockdep stuff.  */
     62 static inline void
     63 __mutex_init(struct mutex *mutex, const char *name __unused,
     64     struct lock_class_key *key __unused)
     65 {
     66 	linux_mutex_init(mutex);
     67 }
     68 
     69 /* Another name collision.  */
     70 static inline void
     71 linux_mutex_destroy(struct mutex *mutex)
     72 {
     73 	mutex_destroy(&mutex->mtx_lock);
     74 }
     75 
     76 static inline void
     77 mutex_lock(struct mutex *mutex)
     78 {
     79 	mutex_enter(&mutex->mtx_lock);
     80 }
     81 
     82 static inline int
     83 mutex_lock_interruptible(struct mutex *mutex)
     84 {
     85 	mutex_enter(&mutex->mtx_lock); /* XXX */
     86 	return 0;
     87 }
     88 
     89 static inline int
     90 mutex_trylock(struct mutex *mutex)
     91 {
     92 	return mutex_tryenter(&mutex->mtx_lock);
     93 }
     94 
     95 static inline void
     96 mutex_unlock(struct mutex *mutex)
     97 {
     98 	mutex_exit(&mutex->mtx_lock);
     99 }
    100 
    101 static inline bool
    102 mutex_is_locked(struct mutex *mutex)
    103 {
    104 	return mutex_owned(&mutex->mtx_lock);
    105 }
    106 
    107 static inline void
    108 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
    109 {
    110 
    111 	KASSERT(mutex_is_locked(already));
    112 	mutex_lock(mutex);
    113 }
    114 
    115 #define	__lockdep_used		__unused
    116 #define	lockdep_assert_held(m)	do {} while (0)
    117 #define	lockdep_is_held(m)	1
    118 
    119 #define	SINGLE_DEPTH_NESTING	0
    120 
    121 static inline void
    122 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
    123 {
    124 	mutex_lock(mutex);
    125 }
    126 
    127 #endif  /* _LINUX_MUTEX_H_ */
    128