diff options
Diffstat (limited to 'include/asm-frv')
| -rw-r--r-- | include/asm-frv/semaphore.h | 156 |
1 files changed, 1 insertions, 155 deletions
diff --git a/include/asm-frv/semaphore.h b/include/asm-frv/semaphore.h index d7aaa1911a1a..d9b2034ed1d2 100644 --- a/include/asm-frv/semaphore.h +++ b/include/asm-frv/semaphore.h | |||
| @@ -1,155 +1 @@ | |||
| 1 | /* semaphore.h: semaphores for the FR-V | #include <linux/semaphore.h> | |
| 2 | * | ||
| 3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | ||
| 4 | * Written by David Howells (dhowells@redhat.com) | ||
| 5 | * | ||
| 6 | * This program is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU General Public License | ||
| 8 | * as published by the Free Software Foundation; either version | ||
| 9 | * 2 of the License, or (at your option) any later version. | ||
| 10 | */ | ||
| 11 | #ifndef _ASM_SEMAPHORE_H | ||
| 12 | #define _ASM_SEMAPHORE_H | ||
| 13 | |||
| 14 | #define RW_LOCK_BIAS 0x01000000 | ||
| 15 | |||
| 16 | #ifndef __ASSEMBLY__ | ||
| 17 | |||
| 18 | #include <linux/linkage.h> | ||
| 19 | #include <linux/wait.h> | ||
| 20 | #include <linux/spinlock.h> | ||
| 21 | #include <linux/rwsem.h> | ||
| 22 | |||
| 23 | /* | ||
| 24 | * the semaphore definition | ||
| 25 | * - if counter is >0 then there are tokens available on the semaphore for down to collect | ||
| 26 | * - if counter is <=0 then there are no spare tokens, and anyone that wants one must wait | ||
| 27 | * - if wait_list is not empty, then there are processes waiting for the semaphore | ||
| 28 | */ | ||
| 29 | struct semaphore { | ||
| 30 | unsigned counter; | ||
| 31 | spinlock_t wait_lock; | ||
| 32 | struct list_head wait_list; | ||
| 33 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 34 | unsigned __magic; | ||
| 35 | #endif | ||
| 36 | }; | ||
| 37 | |||
| 38 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 39 | # define __SEM_DEBUG_INIT(name) , (long)&(name).__magic | ||
| 40 | #else | ||
| 41 | # define __SEM_DEBUG_INIT(name) | ||
| 42 | #endif | ||
| 43 | |||
| 44 | |||
| 45 | #define __SEMAPHORE_INITIALIZER(name,count) \ | ||
| 46 | { count, SPIN_LOCK_UNLOCKED, LIST_HEAD_INIT((name).wait_list) __SEM_DEBUG_INIT(name) } | ||
| 47 | |||
| 48 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ | ||
| 49 | struct semaphore name = __SEMAPHORE_INITIALIZER(name,count) | ||
| 50 | |||
| 51 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1) | ||
| 52 | |||
| 53 | static inline void sema_init (struct semaphore *sem, int val) | ||
| 54 | { | ||
| 55 | *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val); | ||
| 56 | } | ||
| 57 | |||
| 58 | static inline void init_MUTEX (struct semaphore *sem) | ||
| 59 | { | ||
| 60 | sema_init(sem, 1); | ||
| 61 | } | ||
| 62 | |||
| 63 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | ||
| 64 | { | ||
| 65 | sema_init(sem, 0); | ||
| 66 | } | ||
| 67 | |||
| 68 | extern void __down(struct semaphore *sem, unsigned long flags); | ||
| 69 | extern int __down_interruptible(struct semaphore *sem, unsigned long flags); | ||
| 70 | extern void __up(struct semaphore *sem); | ||
| 71 | |||
| 72 | static inline void down(struct semaphore *sem) | ||
| 73 | { | ||
| 74 | unsigned long flags; | ||
| 75 | |||
| 76 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 77 | CHECK_MAGIC(sem->__magic); | ||
| 78 | #endif | ||
| 79 | |||
| 80 | spin_lock_irqsave(&sem->wait_lock, flags); | ||
| 81 | if (likely(sem->counter > 0)) { | ||
| 82 | sem->counter--; | ||
| 83 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 84 | } | ||
| 85 | else { | ||
| 86 | __down(sem, flags); | ||
| 87 | } | ||
| 88 | } | ||
| 89 | |||
| 90 | static inline int down_interruptible(struct semaphore *sem) | ||
| 91 | { | ||
| 92 | unsigned long flags; | ||
| 93 | int ret = 0; | ||
| 94 | |||
| 95 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 96 | CHECK_MAGIC(sem->__magic); | ||
| 97 | #endif | ||
| 98 | |||
| 99 | spin_lock_irqsave(&sem->wait_lock, flags); | ||
| 100 | if (likely(sem->counter > 0)) { | ||
| 101 | sem->counter--; | ||
| 102 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 103 | } | ||
| 104 | else { | ||
| 105 | ret = __down_interruptible(sem, flags); | ||
| 106 | } | ||
| 107 | return ret; | ||
| 108 | } | ||
| 109 | |||
| 110 | /* | ||
| 111 | * non-blockingly attempt to down() a semaphore. | ||
| 112 | * - returns zero if we acquired it | ||
| 113 | */ | ||
| 114 | static inline int down_trylock(struct semaphore *sem) | ||
| 115 | { | ||
| 116 | unsigned long flags; | ||
| 117 | int success = 0; | ||
| 118 | |||
| 119 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 120 | CHECK_MAGIC(sem->__magic); | ||
| 121 | #endif | ||
| 122 | |||
| 123 | spin_lock_irqsave(&sem->wait_lock, flags); | ||
| 124 | if (sem->counter > 0) { | ||
| 125 | sem->counter--; | ||
| 126 | success = 1; | ||
| 127 | } | ||
| 128 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 129 | return !success; | ||
| 130 | } | ||
| 131 | |||
| 132 | static inline void up(struct semaphore *sem) | ||
| 133 | { | ||
| 134 | unsigned long flags; | ||
| 135 | |||
| 136 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 137 | CHECK_MAGIC(sem->__magic); | ||
| 138 | #endif | ||
| 139 | |||
| 140 | spin_lock_irqsave(&sem->wait_lock, flags); | ||
| 141 | if (!list_empty(&sem->wait_list)) | ||
| 142 | __up(sem); | ||
| 143 | else | ||
| 144 | sem->counter++; | ||
| 145 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 146 | } | ||
| 147 | |||
| 148 | static inline int sem_getcount(struct semaphore *sem) | ||
| 149 | { | ||
| 150 | return sem->counter; | ||
| 151 | } | ||
| 152 | |||
| 153 | #endif /* __ASSEMBLY__ */ | ||
| 154 | |||
| 155 | #endif | ||
