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 | ||