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1da177e4 LT |
1 | #ifndef __V850_SEMAPHORE_H__ |
2 | #define __V850_SEMAPHORE_H__ | |
3 | ||
4 | #include <linux/linkage.h> | |
5 | #include <linux/spinlock.h> | |
6 | #include <linux/wait.h> | |
7 | #include <linux/rwsem.h> | |
8 | ||
9 | #include <asm/atomic.h> | |
10 | ||
11 | struct semaphore { | |
12 | atomic_t count; | |
13 | int sleepers; | |
14 | wait_queue_head_t wait; | |
15 | }; | |
16 | ||
17 | #define __SEMAPHORE_INITIALIZER(name,count) \ | |
18 | { ATOMIC_INIT (count), 0, \ | |
19 | __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) } | |
20 | ||
21 | #define __MUTEX_INITIALIZER(name) \ | |
22 | __SEMAPHORE_INITIALIZER (name,1) | |
23 | ||
24 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ | |
25 | struct semaphore name = __SEMAPHORE_INITIALIZER (name,count) | |
26 | ||
27 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1) | |
28 | #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0) | |
29 | ||
30 | extern inline void sema_init (struct semaphore *sem, int val) | |
31 | { | |
32 | *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val); | |
33 | } | |
34 | ||
35 | static inline void init_MUTEX (struct semaphore *sem) | |
36 | { | |
37 | sema_init (sem, 1); | |
38 | } | |
39 | ||
40 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | |
41 | { | |
42 | sema_init (sem, 0); | |
43 | } | |
44 | ||
45 | /* | |
46 | * special register calling convention | |
47 | */ | |
48 | asmlinkage void __down_failed (void); | |
49 | asmlinkage int __down_interruptible_failed (void); | |
50 | asmlinkage int __down_trylock_failed (void); | |
51 | asmlinkage void __up_wakeup (void); | |
52 | ||
53 | extern void __down (struct semaphore * sem); | |
54 | extern int __down_interruptible (struct semaphore * sem); | |
55 | extern int __down_trylock (struct semaphore * sem); | |
56 | extern void __up (struct semaphore * sem); | |
57 | ||
58 | extern inline void down (struct semaphore * sem) | |
59 | { | |
60 | might_sleep(); | |
61 | if (atomic_dec_return (&sem->count) < 0) | |
62 | __down (sem); | |
63 | } | |
64 | ||
65 | extern inline int down_interruptible (struct semaphore * sem) | |
66 | { | |
67 | int ret = 0; | |
68 | might_sleep(); | |
69 | if (atomic_dec_return (&sem->count) < 0) | |
70 | ret = __down_interruptible (sem); | |
71 | return ret; | |
72 | } | |
73 | ||
74 | extern inline int down_trylock (struct semaphore *sem) | |
75 | { | |
76 | int ret = 0; | |
77 | if (atomic_dec_return (&sem->count) < 0) | |
78 | ret = __down_trylock (sem); | |
79 | return ret; | |
80 | } | |
81 | ||
82 | extern inline void up (struct semaphore * sem) | |
83 | { | |
84 | if (atomic_inc_return (&sem->count) <= 0) | |
85 | __up (sem); | |
86 | } | |
87 | ||
88 | #endif /* __V850_SEMAPHORE_H__ */ |