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