kernel-ark/include/asm-v850/semaphore.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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__ */