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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 | ||
1da177e4 LT |
21 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ |
22 | struct semaphore name = __SEMAPHORE_INITIALIZER (name,count) | |
23 | ||
24 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1) | |
25 | #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0) | |
26 | ||
23f88fe4 | 27 | static inline void sema_init (struct semaphore *sem, int val) |
1da177e4 LT |
28 | { |
29 | *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val); | |
30 | } | |
31 | ||
32 | static inline void init_MUTEX (struct semaphore *sem) | |
33 | { | |
34 | sema_init (sem, 1); | |
35 | } | |
36 | ||
37 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | |
38 | { | |
39 | sema_init (sem, 0); | |
40 | } | |
41 | ||
42 | /* | |
43 | * special register calling convention | |
44 | */ | |
45 | asmlinkage void __down_failed (void); | |
46 | asmlinkage int __down_interruptible_failed (void); | |
47 | asmlinkage int __down_trylock_failed (void); | |
48 | asmlinkage void __up_wakeup (void); | |
49 | ||
50 | extern void __down (struct semaphore * sem); | |
51 | extern int __down_interruptible (struct semaphore * sem); | |
52 | extern int __down_trylock (struct semaphore * sem); | |
53 | extern void __up (struct semaphore * sem); | |
54 | ||
23f88fe4 | 55 | static inline void down (struct semaphore * sem) |
1da177e4 LT |
56 | { |
57 | might_sleep(); | |
58 | if (atomic_dec_return (&sem->count) < 0) | |
59 | __down (sem); | |
60 | } | |
61 | ||
23f88fe4 | 62 | static inline int down_interruptible (struct semaphore * sem) |
1da177e4 LT |
63 | { |
64 | int ret = 0; | |
65 | might_sleep(); | |
66 | if (atomic_dec_return (&sem->count) < 0) | |
67 | ret = __down_interruptible (sem); | |
68 | return ret; | |
69 | } | |
70 | ||
23f88fe4 | 71 | static inline int down_trylock (struct semaphore *sem) |
1da177e4 LT |
72 | { |
73 | int ret = 0; | |
74 | if (atomic_dec_return (&sem->count) < 0) | |
75 | ret = __down_trylock (sem); | |
76 | return ret; | |
77 | } | |
78 | ||
23f88fe4 | 79 | static inline void up (struct semaphore * sem) |
1da177e4 LT |
80 | { |
81 | if (atomic_inc_return (&sem->count) <= 0) | |
82 | __up (sem); | |
83 | } | |
84 | ||
85 | #endif /* __V850_SEMAPHORE_H__ */ |