[linux-2.6-block.git] / include / asm-v850 / semaphore.h

#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__ */
Commit	Line	Data
1da177e4 LT	1	#ifndef __V850_SEMAPHORE_H__
	2	#define __V850_SEMAPHORE_H__
	3
	4	#include <linux/linkage.h>
	5	#include <linux/spinlock.h>
	6	#include <linux/wait.h>
	7	#include <linux/rwsem.h>
	8
	9	#include <asm/atomic.h>
	10
	11	struct semaphore {
	12	atomic_t count;
	13	int sleepers;
	14	wait_queue_head_t wait;
	15	};
	16
	17	#define __SEMAPHORE_INITIALIZER(name,count) \
	18	{ ATOMIC_INIT (count), 0, \
	19	__WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
	20
1da177e4 LT	21	#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
	22	struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
	23
	24	#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1)
	25	#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0)
	26
23f88fe4	27	static inline void sema_init (struct semaphore *sem, int val)
1da177e4 LT	28	{
	29	sem = (struct semaphore)__SEMAPHORE_INITIALIZER((sem),val);
	30	}
	31
	32	static inline void init_MUTEX (struct semaphore *sem)
	33	{
	34	sema_init (sem, 1);
	35	}
	36
	37	static inline void init_MUTEX_LOCKED (struct semaphore *sem)
	38	{
	39	sema_init (sem, 0);
	40	}
	41
	42	/*
	43	* special register calling convention
	44	*/
	45	asmlinkage void __down_failed (void);
	46	asmlinkage int __down_interruptible_failed (void);
	47	asmlinkage int __down_trylock_failed (void);
	48	asmlinkage void __up_wakeup (void);
	49
	50	extern void __down (struct semaphore * sem);
	51	extern int __down_interruptible (struct semaphore * sem);
	52	extern int __down_trylock (struct semaphore * sem);
	53	extern void __up (struct semaphore * sem);
	54
23f88fe4	55	static inline void down (struct semaphore * sem)
1da177e4 LT	56	{
	57	might_sleep();
	58	if (atomic_dec_return (&sem->count) < 0)
	59	__down (sem);
	60	}
	61
23f88fe4	62	static inline int down_interruptible (struct semaphore * sem)
1da177e4 LT	63	{
	64	int ret = 0;
	65	might_sleep();
	66	if (atomic_dec_return (&sem->count) < 0)
	67	ret = __down_interruptible (sem);
	68	return ret;
	69	}
	70
23f88fe4	71	static inline int down_trylock (struct semaphore *sem)
1da177e4 LT	72	{
	73	int ret = 0;
	74	if (atomic_dec_return (&sem->count) < 0)
	75	ret = __down_trylock (sem);
	76	return ret;
	77	}
	78
23f88fe4	79	static inline void up (struct semaphore * sem)
1da177e4 LT	80	{
	81	if (atomic_inc_return (&sem->count) <= 0)
	82	__up (sem);
	83	}
	84
	85	#endif /* __V850_SEMAPHORE_H__ */