android_kernel_xiaomi_sm8350/include/asm-v850/semaphore.h
Arthur Othieno 727a53bd53 [PATCH] semaphore: Remove __MUTEX_INITIALIZER()
__MUTEX_INITIALIZER() has no users, and equates to the more commonly used
DECLARE_MUTEX(), thus making it pretty much redundant.  Remove it for good.

Signed-off-by: Arthur Othieno <a.othieno@bluewin.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:27 -08:00

86 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 __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__ */