1 1.17 riastrad /* $NetBSD: mutex.h,v 1.17 2021/12/19 11:33:31 riastradh Exp $ */ 2 1.2 riastrad 3 1.2 riastrad /*- 4 1.2 riastrad * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2 riastrad * All rights reserved. 6 1.2 riastrad * 7 1.2 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.2 riastrad * by Taylor R. Campbell. 9 1.2 riastrad * 10 1.2 riastrad * Redistribution and use in source and binary forms, with or without 11 1.2 riastrad * modification, are permitted provided that the following conditions 12 1.2 riastrad * are met: 13 1.2 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.2 riastrad * notice, this list of conditions and the following disclaimer. 15 1.2 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.2 riastrad * documentation and/or other materials provided with the distribution. 18 1.2 riastrad * 19 1.2 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.2 riastrad */ 31 1.2 riastrad 32 1.2 riastrad #ifndef _LINUX_MUTEX_H_ 33 1.2 riastrad #define _LINUX_MUTEX_H_ 34 1.2 riastrad 35 1.2 riastrad #include <sys/mutex.h> 36 1.2 riastrad 37 1.3 riastrad #include <lib/libkern/libkern.h> /* KASSERT */ 38 1.12 maya 39 1.12 maya #include <asm/processor.h> 40 1.12 maya 41 1.8 riastrad #include <linux/list.h> 42 1.13 riastrad #include <linux/spinlock.h> 43 1.3 riastrad 44 1.2 riastrad struct mutex { 45 1.2 riastrad kmutex_t mtx_lock; 46 1.2 riastrad }; 47 1.2 riastrad 48 1.5 riastrad struct lock_class_key { 49 1.5 riastrad }; 50 1.5 riastrad 51 1.2 riastrad /* Name collision. Pooh. */ 52 1.2 riastrad static inline void 53 1.2 riastrad linux_mutex_init(struct mutex *mutex) 54 1.2 riastrad { 55 1.2 riastrad mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE); 56 1.2 riastrad } 57 1.2 riastrad 58 1.5 riastrad /* Lockdep stuff. */ 59 1.5 riastrad static inline void 60 1.5 riastrad __mutex_init(struct mutex *mutex, const char *name __unused, 61 1.5 riastrad struct lock_class_key *key __unused) 62 1.5 riastrad { 63 1.5 riastrad linux_mutex_init(mutex); 64 1.5 riastrad } 65 1.5 riastrad 66 1.2 riastrad /* Another name collision. */ 67 1.2 riastrad static inline void 68 1.2 riastrad linux_mutex_destroy(struct mutex *mutex) 69 1.2 riastrad { 70 1.2 riastrad mutex_destroy(&mutex->mtx_lock); 71 1.2 riastrad } 72 1.2 riastrad 73 1.2 riastrad static inline void 74 1.2 riastrad mutex_lock(struct mutex *mutex) 75 1.2 riastrad { 76 1.2 riastrad mutex_enter(&mutex->mtx_lock); 77 1.2 riastrad } 78 1.2 riastrad 79 1.2 riastrad static inline int 80 1.2 riastrad mutex_lock_interruptible(struct mutex *mutex) 81 1.2 riastrad { 82 1.2 riastrad mutex_enter(&mutex->mtx_lock); /* XXX */ 83 1.2 riastrad return 0; 84 1.2 riastrad } 85 1.2 riastrad 86 1.2 riastrad static inline int 87 1.2 riastrad mutex_trylock(struct mutex *mutex) 88 1.2 riastrad { 89 1.2 riastrad return mutex_tryenter(&mutex->mtx_lock); 90 1.2 riastrad } 91 1.2 riastrad 92 1.2 riastrad static inline void 93 1.2 riastrad mutex_unlock(struct mutex *mutex) 94 1.2 riastrad { 95 1.2 riastrad mutex_exit(&mutex->mtx_lock); 96 1.2 riastrad } 97 1.2 riastrad 98 1.2 riastrad static inline bool 99 1.2 riastrad mutex_is_locked(struct mutex *mutex) 100 1.2 riastrad { 101 1.2 riastrad return mutex_owned(&mutex->mtx_lock); 102 1.2 riastrad } 103 1.2 riastrad 104 1.3 riastrad static inline void 105 1.3 riastrad mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already) 106 1.3 riastrad { 107 1.3 riastrad 108 1.3 riastrad KASSERT(mutex_is_locked(already)); 109 1.3 riastrad mutex_lock(mutex); 110 1.3 riastrad } 111 1.3 riastrad 112 1.6 riastrad static inline void 113 1.6 riastrad mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused) 114 1.6 riastrad { 115 1.6 riastrad mutex_lock(mutex); 116 1.6 riastrad } 117 1.6 riastrad 118 1.17 riastrad static inline int 119 1.17 riastrad mutex_lock_interruptible_nested(struct mutex *mutex, 120 1.17 riastrad unsigned subclass __unused) 121 1.17 riastrad { 122 1.17 riastrad return mutex_lock_interruptible(mutex); 123 1.17 riastrad } 124 1.17 riastrad 125 1.16 riastrad /* 126 1.16 riastrad * `recursive locking is bad, do not use this ever.' 127 1.16 riastrad * -- linux/scripts/checkpath.pl 128 1.16 riastrad */ 129 1.16 riastrad static inline enum { 130 1.16 riastrad MUTEX_TRYLOCK_FAILED, 131 1.16 riastrad MUTEX_TRYLOCK_SUCCESS, 132 1.16 riastrad MUTEX_TRYLOCK_RECURSIVE, 133 1.16 riastrad } 134 1.16 riastrad mutex_trylock_recursive(struct mutex *mutex) 135 1.16 riastrad { 136 1.16 riastrad if (mutex_owned(&mutex->mtx_lock)) 137 1.16 riastrad return MUTEX_TRYLOCK_RECURSIVE; 138 1.16 riastrad else if (mutex_tryenter(&mutex->mtx_lock)) 139 1.16 riastrad return MUTEX_TRYLOCK_SUCCESS; 140 1.16 riastrad else 141 1.16 riastrad return MUTEX_TRYLOCK_FAILED; 142 1.16 riastrad } 143 1.16 riastrad 144 1.2 riastrad #endif /* _LINUX_MUTEX_H_ */ 145
Indexes created Sat Sep 20 22:09:52 GMT 2025