diff options
Diffstat (limited to 'include/asm-arm/semaphore.h')
-rw-r--r-- | include/asm-arm/semaphore.h | 99 |
1 files changed, 1 insertions, 98 deletions
diff --git a/include/asm-arm/semaphore.h b/include/asm-arm/semaphore.h index 1c8b441f89e3..d9b2034ed1d2 100644 --- a/include/asm-arm/semaphore.h +++ b/include/asm-arm/semaphore.h | |||
@@ -1,98 +1 @@ | |||
1 | /* | #include <linux/semaphore.h> | |
2 | * linux/include/asm-arm/semaphore.h | ||
3 | */ | ||
4 | #ifndef __ASM_ARM_SEMAPHORE_H | ||
5 | #define __ASM_ARM_SEMAPHORE_H | ||
6 | |||
7 | #include <linux/linkage.h> | ||
8 | #include <linux/spinlock.h> | ||
9 | #include <linux/wait.h> | ||
10 | #include <linux/rwsem.h> | ||
11 | |||
12 | #include <asm/atomic.h> | ||
13 | #include <asm/locks.h> | ||
14 | |||
15 | struct semaphore { | ||
16 | atomic_t count; | ||
17 | int sleepers; | ||
18 | wait_queue_head_t wait; | ||
19 | }; | ||
20 | |||
21 | #define __SEMAPHORE_INIT(name, cnt) \ | ||
22 | { \ | ||
23 | .count = ATOMIC_INIT(cnt), \ | ||
24 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait), \ | ||
25 | } | ||
26 | |||
27 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ | ||
28 | struct semaphore name = __SEMAPHORE_INIT(name,count) | ||
29 | |||
30 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1) | ||
31 | |||
32 | static inline void sema_init(struct semaphore *sem, int val) | ||
33 | { | ||
34 | atomic_set(&sem->count, val); | ||
35 | sem->sleepers = 0; | ||
36 | init_waitqueue_head(&sem->wait); | ||
37 | } | ||
38 | |||
39 | static inline void init_MUTEX(struct semaphore *sem) | ||
40 | { | ||
41 | sema_init(sem, 1); | ||
42 | } | ||
43 | |||
44 | static inline void init_MUTEX_LOCKED(struct semaphore *sem) | ||
45 | { | ||
46 | sema_init(sem, 0); | ||
47 | } | ||
48 | |||
49 | /* | ||
50 | * special register calling convention | ||
51 | */ | ||
52 | asmlinkage void __down_failed(void); | ||
53 | asmlinkage int __down_interruptible_failed(void); | ||
54 | asmlinkage int __down_trylock_failed(void); | ||
55 | asmlinkage void __up_wakeup(void); | ||
56 | |||
57 | extern void __down(struct semaphore * sem); | ||
58 | extern int __down_interruptible(struct semaphore * sem); | ||
59 | extern int __down_trylock(struct semaphore * sem); | ||
60 | extern void __up(struct semaphore * sem); | ||
61 | |||
62 | /* | ||
63 | * This is ugly, but we want the default case to fall through. | ||
64 | * "__down" is the actual routine that waits... | ||
65 | */ | ||
66 | static inline void down(struct semaphore * sem) | ||
67 | { | ||
68 | might_sleep(); | ||
69 | __down_op(sem, __down_failed); | ||
70 | } | ||
71 | |||
72 | /* | ||
73 | * This is ugly, but we want the default case to fall through. | ||
74 | * "__down_interruptible" is the actual routine that waits... | ||
75 | */ | ||
76 | static inline int down_interruptible (struct semaphore * sem) | ||
77 | { | ||
78 | might_sleep(); | ||
79 | return __down_op_ret(sem, __down_interruptible_failed); | ||
80 | } | ||
81 | |||
82 | static inline int down_trylock(struct semaphore *sem) | ||
83 | { | ||
84 | return __down_op_ret(sem, __down_trylock_failed); | ||
85 | } | ||
86 | |||
87 | /* | ||
88 | * Note! This is subtle. We jump to wake people up only if | ||
89 | * the semaphore was negative (== somebody was waiting on it). | ||
90 | * The default case (no contention) will result in NO | ||
91 | * jumps for both down() and up(). | ||
92 | */ | ||
93 | static inline void up(struct semaphore * sem) | ||
94 | { | ||
95 | __up_op(sem, __up_wakeup); | ||
96 | } | ||
97 | |||
98 | #endif | ||