diff options
Diffstat (limited to 'include/asm-ppc/semaphore.h')
-rw-r--r-- | include/asm-ppc/semaphore.h | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/include/asm-ppc/semaphore.h b/include/asm-ppc/semaphore.h deleted file mode 100644 index 89e6e73be08c..000000000000 --- a/include/asm-ppc/semaphore.h +++ /dev/null | |||
@@ -1,111 +0,0 @@ | |||
1 | #ifndef _PPC_SEMAPHORE_H | ||
2 | #define _PPC_SEMAPHORE_H | ||
3 | |||
4 | /* | ||
5 | * Swiped from asm-sparc/semaphore.h and modified | ||
6 | * -- Cort (cort@cs.nmt.edu) | ||
7 | * | ||
8 | * Stole some rw spinlock-based semaphore stuff from asm-alpha/semaphore.h | ||
9 | * -- Ani Joshi (ajoshi@unixbox.com) | ||
10 | * | ||
11 | * Remove spinlock-based RW semaphores; RW semaphore definitions are | ||
12 | * now in rwsem.h and we use the generic lib/rwsem.c implementation. | ||
13 | * Rework semaphores to use atomic_dec_if_positive. | ||
14 | * -- Paul Mackerras (paulus@samba.org) | ||
15 | */ | ||
16 | |||
17 | #ifdef __KERNEL__ | ||
18 | |||
19 | #include <asm/atomic.h> | ||
20 | #include <asm/system.h> | ||
21 | #include <linux/wait.h> | ||
22 | #include <linux/rwsem.h> | ||
23 | |||
24 | struct semaphore { | ||
25 | /* | ||
26 | * Note that any negative value of count is equivalent to 0, | ||
27 | * but additionally indicates that some process(es) might be | ||
28 | * sleeping on `wait'. | ||
29 | */ | ||
30 | atomic_t count; | ||
31 | wait_queue_head_t wait; | ||
32 | }; | ||
33 | |||
34 | #define __SEMAPHORE_INITIALIZER(name, n) \ | ||
35 | { \ | ||
36 | .count = ATOMIC_INIT(n), \ | ||
37 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \ | ||
38 | } | ||
39 | |||
40 | #define __MUTEX_INITIALIZER(name) \ | ||
41 | __SEMAPHORE_INITIALIZER(name, 1) | ||
42 | |||
43 | #define __DECLARE_SEMAPHORE_GENERIC(name, count) \ | ||
44 | struct semaphore name = __SEMAPHORE_INITIALIZER(name,count) | ||
45 | |||
46 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1) | ||
47 | #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0) | ||
48 | |||
49 | static inline void sema_init (struct semaphore *sem, int val) | ||
50 | { | ||
51 | atomic_set(&sem->count, val); | ||
52 | init_waitqueue_head(&sem->wait); | ||
53 | } | ||
54 | |||
55 | static inline void init_MUTEX (struct semaphore *sem) | ||
56 | { | ||
57 | sema_init(sem, 1); | ||
58 | } | ||
59 | |||
60 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | ||
61 | { | ||
62 | sema_init(sem, 0); | ||
63 | } | ||
64 | |||
65 | extern void __down(struct semaphore * sem); | ||
66 | extern int __down_interruptible(struct semaphore * sem); | ||
67 | extern void __up(struct semaphore * sem); | ||
68 | |||
69 | extern inline void down(struct semaphore * sem) | ||
70 | { | ||
71 | might_sleep(); | ||
72 | |||
73 | /* | ||
74 | * Try to get the semaphore, take the slow path if we fail. | ||
75 | */ | ||
76 | if (atomic_dec_return(&sem->count) < 0) | ||
77 | __down(sem); | ||
78 | smp_wmb(); | ||
79 | } | ||
80 | |||
81 | extern inline int down_interruptible(struct semaphore * sem) | ||
82 | { | ||
83 | int ret = 0; | ||
84 | |||
85 | might_sleep(); | ||
86 | |||
87 | if (atomic_dec_return(&sem->count) < 0) | ||
88 | ret = __down_interruptible(sem); | ||
89 | smp_wmb(); | ||
90 | return ret; | ||
91 | } | ||
92 | |||
93 | extern inline int down_trylock(struct semaphore * sem) | ||
94 | { | ||
95 | int ret; | ||
96 | |||
97 | ret = atomic_dec_if_positive(&sem->count) < 0; | ||
98 | smp_wmb(); | ||
99 | return ret; | ||
100 | } | ||
101 | |||
102 | extern inline void up(struct semaphore * sem) | ||
103 | { | ||
104 | smp_wmb(); | ||
105 | if (atomic_inc_return(&sem->count) <= 0) | ||
106 | __up(sem); | ||
107 | } | ||
108 | |||
109 | #endif /* __KERNEL__ */ | ||
110 | |||
111 | #endif /* !(_PPC_SEMAPHORE_H) */ | ||