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mutex.h revision 1.13 
      1 /*	$NetBSD: mutex.h,v 1.13 2021/12/19 00:47:24 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 #include <asm/processor.h>
     40 
     41 #include <linux/list.h>
     42 #include <linux/spinlock.h>
     43 
     44 #define	__acquires(lock)			/* XXX lockdep stuff */
     45 #define	__releases(lock)			/* XXX lockdep stuff */
     46 #define might_lock(lock) do {} while(0) 	/* XXX lockdep stuff */
     47 
     48 struct mutex {
     49 	kmutex_t mtx_lock;
     50 };
     51 
     52 struct lock_class_key {
     53 };
     54 
     55 /* Name collision.  Pooh.  */
     56 static inline void
     57 linux_mutex_init(struct mutex *mutex)
     58 {
     59 	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
     60 }
     61 
     62 /* Lockdep stuff.  */
     63 static inline void
     64 __mutex_init(struct mutex *mutex, const char *name __unused,
     65     struct lock_class_key *key __unused)
     66 {
     67 	linux_mutex_init(mutex);
     68 }
     69 
     70 /* Another name collision.  */
     71 static inline void
     72 linux_mutex_destroy(struct mutex *mutex)
     73 {
     74 	mutex_destroy(&mutex->mtx_lock);
     75 }
     76 
     77 static inline void
     78 mutex_lock(struct mutex *mutex)
     79 {
     80 	mutex_enter(&mutex->mtx_lock);
     81 }
     82 
     83 static inline int
     84 mutex_lock_interruptible(struct mutex *mutex)
     85 {
     86 	mutex_enter(&mutex->mtx_lock); /* XXX */
     87 	return 0;
     88 }
     89 
     90 static inline int
     91 mutex_trylock(struct mutex *mutex)
     92 {
     93 	return mutex_tryenter(&mutex->mtx_lock);
     94 }
     95 
     96 static inline void
     97 mutex_unlock(struct mutex *mutex)
     98 {
     99 	mutex_exit(&mutex->mtx_lock);
    100 }
    101 
    102 static inline bool
    103 mutex_is_locked(struct mutex *mutex)
    104 {
    105 	return mutex_owned(&mutex->mtx_lock);
    106 }
    107 
    108 static inline void
    109 mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
    110 {
    111 
    112 	KASSERT(mutex_is_locked(already));
    113 	mutex_lock(mutex);
    114 }
    115 
    116 #define	__lockdep_used		__unused
    117 #define	lockdep_assert_held(m)	do {} while (0)
    118 #define	lockdep_is_held(m)	1
    119 
    120 #define	SINGLE_DEPTH_NESTING	0
    121 
    122 static inline void
    123 mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
    124 {
    125 	mutex_lock(mutex);
    126 }
    127 
    128 #endif  /* _LINUX_MUTEX_H_ */
    129