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1da177e4 LT |
1 | #ifndef _ASM_IA64_SEMAPHORE_H |
2 | #define _ASM_IA64_SEMAPHORE_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 1998-2000 Hewlett-Packard Co | |
6 | * Copyright (C) 1998-2000 David Mosberger-Tang <davidm@hpl.hp.com> | |
7 | */ | |
8 | ||
9 | #include <linux/wait.h> | |
10 | #include <linux/rwsem.h> | |
11 | ||
12 | #include <asm/atomic.h> | |
13 | ||
14 | struct semaphore { | |
15 | atomic_t count; | |
16 | int sleepers; | |
17 | wait_queue_head_t wait; | |
18 | }; | |
19 | ||
20 | #define __SEMAPHORE_INITIALIZER(name, n) \ | |
21 | { \ | |
22 | .count = ATOMIC_INIT(n), \ | |
23 | .sleepers = 0, \ | |
24 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \ | |
25 | } | |
26 | ||
1da177e4 LT |
27 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ |
28 | struct semaphore name = __SEMAPHORE_INITIALIZER(name, count) | |
29 | ||
30 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1) | |
1da177e4 LT |
31 | |
32 | static inline void | |
33 | sema_init (struct semaphore *sem, int val) | |
34 | { | |
35 | *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val); | |
36 | } | |
37 | ||
38 | static inline void | |
39 | init_MUTEX (struct semaphore *sem) | |
40 | { | |
41 | sema_init(sem, 1); | |
42 | } | |
43 | ||
44 | static inline void | |
45 | init_MUTEX_LOCKED (struct semaphore *sem) | |
46 | { | |
47 | sema_init(sem, 0); | |
48 | } | |
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 | ||
55 | /* | |
56 | * Atomically decrement the semaphore's count. If it goes negative, | |
57 | * block the calling thread in the TASK_UNINTERRUPTIBLE state. | |
58 | */ | |
59 | static inline void | |
60 | down (struct semaphore *sem) | |
61 | { | |
62 | might_sleep(); | |
4b16bfbf | 63 | if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1) |
1da177e4 LT |
64 | __down(sem); |
65 | } | |
66 | ||
67 | /* | |
68 | * Atomically decrement the semaphore's count. If it goes negative, | |
69 | * block the calling thread in the TASK_INTERRUPTIBLE state. | |
70 | */ | |
71 | static inline int | |
72 | down_interruptible (struct semaphore * sem) | |
73 | { | |
74 | int ret = 0; | |
75 | ||
76 | might_sleep(); | |
4b16bfbf | 77 | if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1) |
1da177e4 LT |
78 | ret = __down_interruptible(sem); |
79 | return ret; | |
80 | } | |
81 | ||
82 | static inline int | |
83 | down_trylock (struct semaphore *sem) | |
84 | { | |
85 | int ret = 0; | |
86 | ||
4b16bfbf | 87 | if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1) |
1da177e4 LT |
88 | ret = __down_trylock(sem); |
89 | return ret; | |
90 | } | |
91 | ||
92 | static inline void | |
93 | up (struct semaphore * sem) | |
94 | { | |
4b16bfbf | 95 | if (ia64_fetchadd(1, &sem->count.counter, rel) <= -1) |
1da177e4 LT |
96 | __up(sem); |
97 | } | |
98 | ||
99 | #endif /* _ASM_IA64_SEMAPHORE_H */ |