LXR linux/include/asm-sparc64/semaphore.h

   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 __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
  30static inline void sema_init (struct semaphore *sem, int val)
  31{
  32        atomic_set(&sem->count, val);
  33        init_waitqueue_head(&sem->wait);
  34}
  35
  36static inline void init_MUTEX (struct semaphore *sem)
  37{
  38        sema_init(sem, 1);
  39}
  40
  41static inline void init_MUTEX_LOCKED (struct semaphore *sem)
  42{
  43        sema_init(sem, 0);
  44}
  45
  46extern void up(struct semaphore *sem);
  47extern void down(struct semaphore *sem);
  48extern int down_trylock(struct semaphore *sem);
  49extern int down_interruptible(struct semaphore *sem);
  50
  51#endif /* __KERNEL__ */
  52
  53#endif /* !(_SPARC64_SEMAPHORE_H) */
  54