include/asm-arm/semaphore.h

   1 /*
   2  * linux/include/asm-arm/semaphore.h
   3  */
   4 #ifndef __ASM_ARM_SEMAPHORE_H
   5 #define __ASM_ARM_SEMAPHORE_H
   6
   7 #include <linux/linkage.h>
   8 #include <asm/atomic.h>
   9
  10 struct semaphore {
  11         atomic_t count;
  12         int waking;
  13         wait_queue_head_t wait;
  14 };
  15
  16 #define MUTEX ((struct semaphore) { ATOMIC_INIT(1), 0, NULL })
  17 #define MUTEX_LOCKED ((struct semaphore) { ATOMIC_INIT(0), 0, NULL })
  18
  19 asmlinkage void __down_failed (void /* special register calling convention */);
  20 asmlinkage int  __down_interruptible_failed (void /* special register calling convention */);
  21 asmlinkage int  __down_failed_trylock(void  /* params in registers */);
  22 asmlinkage void __up_wakeup (void /* special register calling convention */);
  23
  24 extern void __down(struct semaphore * sem);
  25 extern int  __down_interruptible(struct semaphore * sem);
  26 extern int  __down_trylock(struct semaphore * sem);
  27 extern void __up(struct semaphore * sem);
  28
  29 #define sema_init(sem, val)     atomic_set(&((sem)->count), (val))
  30
  31 #include <asm/proc/semaphore.h>
  32
  33 #endif