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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _SPARC64_SEMAPHORE_H
2#define _SPARC64_SEMAPHORE_H
3
4/* These are actually reasonable on the V9.
5 *
6 * See asm-ppc/semaphore.h for implementation commentary,
7 * only sparc64 specific issues are commented here.
8 */
9#ifdef __KERNEL__
10
11#include <asm/atomic.h>
12#include <asm/system.h>
13#include <linux/wait.h>
14#include <linux/rwsem.h>
15
16struct semaphore {
17 atomic_t count;
18 wait_queue_head_t wait;
19};
20
21#define __SEMAPHORE_INITIALIZER(name, count) \
22 { ATOMIC_INIT(count), \
23 __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) }
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define __DECLARE_SEMAPHORE_GENERIC(name, count) \
26 struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
27
28#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1)
29#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0)
30
31static inline void sema_init (struct semaphore *sem, int val)
32{
33 atomic_set(&sem->count, val);
34 init_waitqueue_head(&sem->wait);
35}
36
37static inline void init_MUTEX (struct semaphore *sem)
38{
39 sema_init(sem, 1);
40}
41
42static inline void init_MUTEX_LOCKED (struct semaphore *sem)
43{
44 sema_init(sem, 0);
45}
46
47extern void up(struct semaphore *sem);
48extern void down(struct semaphore *sem);
49extern int down_trylock(struct semaphore *sem);
50extern int down_interruptible(struct semaphore *sem);
51
52#endif /* __KERNEL__ */
53
54#endif /* !(_SPARC64_SEMAPHORE_H) */