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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#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
25#define __MUTEX_INITIALIZER(name) \
26 __SEMAPHORE_INITIALIZER(name, 1)
27
28#define __DECLARE_SEMAPHORE_GENERIC(name, count) \
29 struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
30
31#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1)
32#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0)
33
34static inline void sema_init (struct semaphore *sem, int val)
35{
36 atomic_set(&sem->count, val);
37 init_waitqueue_head(&sem->wait);
38}
39
40static inline void init_MUTEX (struct semaphore *sem)
41{
42 sema_init(sem, 1);
43}
44
45static inline void init_MUTEX_LOCKED (struct semaphore *sem)
46{
47 sema_init(sem, 0);
48}
49
50extern void up(struct semaphore *sem);
51extern void down(struct semaphore *sem);
52extern int down_trylock(struct semaphore *sem);
53extern int down_interruptible(struct semaphore *sem);
54
55#endif /* __KERNEL__ */
56
57#endif /* !(_SPARC64_SEMAPHORE_H) */