58 static inline void sema_init (struct semaphore *sem, int val)  in sema_init()  argument
60 	atomic_set(&sem->count, val);  in sema_init()
61 	init_waitqueue_head(&sem->wait);  in sema_init()
63 	sem->__magic = (long)&sem->__magic;  in sema_init()
67 static inline void init_MUTEX (struct semaphore *sem)  in init_MUTEX()  argument
69 	sema_init(sem, 1);  in init_MUTEX()
72 static inline void init_MUTEX_LOCKED (struct semaphore *sem)  in init_MUTEX_LOCKED()  argument
74 	sema_init(sem, 0);  in init_MUTEX_LOCKED()
77 extern void __down(struct semaphore * sem);
78 extern int  __down_interruptible(struct semaphore * sem);
79 extern void __up(struct semaphore * sem);
81 extern inline void down(struct semaphore * sem)  in down()  argument
84 	CHECK_MAGIC(sem->__magic);  in down()
90 	if (atomic_dec_return(&sem->count) < 0)  in down()
91 		__down(sem);  in down()
95 extern inline int down_interruptible(struct semaphore * sem)  in down_interruptible()  argument
100 	CHECK_MAGIC(sem->__magic);  in down_interruptible()
103 	if (atomic_dec_return(&sem->count) < 0)  in down_interruptible()
104 		ret = __down_interruptible(sem);  in down_interruptible()
109 extern inline int down_trylock(struct semaphore * sem)  in down_trylock()  argument
114 	CHECK_MAGIC(sem->__magic);  in down_trylock()
117 	ret = atomic_dec_if_positive(&sem->count) < 0;  in down_trylock()
122 extern inline void up(struct semaphore * sem)  in up()  argument
125 	CHECK_MAGIC(sem->__magic);  in up()
129 	if (atomic_inc_return(&sem->count) <= 0)  in up()
130 		__up(sem);  in up()
133 static inline int sem_getcount(struct semaphore *sem)  in sem_getcount()  argument
135 	return atomic_read(&sem->count);  in sem_getcount()