include/asm-arm/semaphore.h

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 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 #include <linux/spinlock.h>
 10 #include <linux/wait.h>
 11
 12 struct semaphore {
 13  atomic_t count;
 14 int sleepers;
 15  wait_queue_head_t wait;
 16 };
 17
 18 #define __SEMAPHORE_INIT(name,count) \
 19  { ATOMIC_INIT(count), 0, \
 20  __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) }
 21
 22 #define __MUTEX_INITIALIZER(name) \
 23  __SEMAPHORE_INIT(name,1)
 24
 25 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
 26  struct semaphore name = __SEMAPHORE_INIT(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 #define sema_init(sem, val) \
 32 do { \
 33  atomic_set(&((sem)->count), (val)); \
 34  (sem)->sleepers = 0; \
 35  init_waitqueue_head(&(sem)->wait); \
 36 } while (0)
 37
 38 staticinlinevoidinit_MUTEX(struct semaphore *sem)
 39 {
 40 sema_init(sem,1);
 41 }
 42
 43 staticinlinevoidinit_MUTEX_LOCKED(struct semaphore *sem)
 44 {
 45 sema_init(sem,0);
 46 }
 47
 48 asmlinkage void__down_failed(void/* special register calling convention */);
 49 asmlinkage int__down_interruptible_failed(void/* special register calling convention */);
 50 asmlinkage int__down_trylock_failed(void/* params in registers */);
 51 asmlinkage void__up_wakeup(void/* special register calling convention */);
 52
 53 externvoid__down(struct semaphore * sem);
 54 externint__down_interruptible(struct semaphore * sem);
 55 externint__down_trylock(struct semaphore * sem);
 56 externvoid__up(struct semaphore * sem);
 57
 58 extern spinlock_t semaphore_wake_lock;
 59
 60 #include <asm/proc/semaphore.h>
 61
 62 #endif