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 __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
  34 static inline void sema_init (struct semaphore *sem, int val)
  35 {
  36         atomic_set(&sem->count, val);
  37         init_waitqueue_head(&sem->wait);
  38 }
  39
  40 static inline void init_MUTEX (struct semaphore *sem)
  41 {
  42         sema_init(sem, 1);
  43 }
  44
  45 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
  46 {
  47         sema_init(sem, 0);
  48 }
  49
  50 extern void up(struct semaphore *sem);
  51 extern void down(struct semaphore *sem);
  52 extern int down_trylock(struct semaphore *sem);
  53 extern int down_interruptible(struct semaphore *sem);
  54
  55 #endif /* __KERNEL__ */
  56
  57 #endif /* !(_SPARC64_SEMAPHORE_H) */