89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
#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 __MUTEX_INITIALIZER(name) \
|
|
__SEMAPHORE_INITIALIZER (name,1)
|
|
|
|
#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)
|
|
|
|
extern 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);
|
|
|
|
extern inline void down (struct semaphore * sem)
|
|
{
|
|
might_sleep();
|
|
if (atomic_dec_return (&sem->count) < 0)
|
|
__down (sem);
|
|
}
|
|
|
|
extern 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;
|
|
}
|
|
|
|
extern inline int down_trylock (struct semaphore *sem)
|
|
{
|
|
int ret = 0;
|
|
if (atomic_dec_return (&sem->count) < 0)
|
|
ret = __down_trylock (sem);
|
|
return ret;
|
|
}
|
|
|
|
extern inline void up (struct semaphore * sem)
|
|
{
|
|
if (atomic_inc_return (&sem->count) <= 0)
|
|
__up (sem);
|
|
}
|
|
|
|
#endif /* __V850_SEMAPHORE_H__ */
|