#ifndef __V850_SEMAPHORE_H__ #define __V850_SEMAPHORE_H__ #include <linux/linkage.h> #include <linux/spinlock.h> #include <linux/wait.h> #include <linux/rwsem.h> #include <asm/atomic.h> struct semaphore { atomic_t count; int sleepers; wait_queue_head_t wait; }; #define __SEMAPHORE_INITIALIZER(name,count) \ { ATOMIC_INIT (count), 0, \ __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) } #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ struct semaphore name = __SEMAPHORE_INITIALIZER (name,count) #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1) #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0) static inline void sema_init (struct semaphore *sem, int val) { *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val); } static inline void init_MUTEX (struct semaphore *sem) { sema_init (sem, 1); } static inline void init_MUTEX_LOCKED (struct semaphore *sem) { sema_init (sem, 0); } /* * special register calling convention */ asmlinkage void __down_failed (void); asmlinkage int __down_interruptible_failed (void); asmlinkage int __down_trylock_failed (void); asmlinkage void __up_wakeup (void); extern void __down (struct semaphore * sem); extern int __down_interruptible (struct semaphore * sem); extern int __down_trylock (struct semaphore * sem); extern void __up (struct semaphore * sem); static inline void down (struct semaphore * sem) { might_sleep(); if (atomic_dec_return (&sem->count) < 0) __down (sem); } static inline int down_interruptible (struct semaphore * sem) { int ret = 0; might_sleep(); if (atomic_dec_return (&sem->count) < 0) ret = __down_interruptible (sem); return ret; } static inline int down_trylock (struct semaphore *sem) { int ret = 0; if (atomic_dec_return (&sem->count) < 0) ret = __down_trylock (sem); return ret; } static inline void up (struct semaphore * sem) { if (atomic_inc_return (&sem->count) <= 0) __up (sem); } #endif /* __V850_SEMAPHORE_H__ */