/**
* down_interruptible - acquire the semaphore unless interrupted
* @sem: the semaphore to be acquired
*
* Attempts to acquire the semaphore. If no more tasks are allowed to
* acquire the semaphore, calling this function will put the task to sleep.
* If the sleep is interrupted by a signal, this function will return -EINTR.
* If the semaphore is successfully acquired, this function returns 0.
*/
int down_interruptible(struct semaphore *sem)
{
unsigned long flags;
int result = 0;
spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0)){
sem->count--;
}else{
#ifdef CONFIG_MT_LOCK_DEBUG
if(sem->owner == current){
char aee_str[40];
printk("[Warning!Recursive Semaphore!][%d:%s], down_interruptible:%s(0x%x)\n", current->pid, current->comm, sem->sem_name, sem);
sprintf( aee_str, "Recursive SemLock:%s\n", current->comm);
aee_kernel_warning( aee_str,"mtlock debugger\n");
dump_stack();
}
#endif
result = __down_interruptible(sem);
}
#ifdef CONFIG_MT_LOCK_DEBUG
if(0 == sem->count)
sem_set_owner(sem);
#endif
spin_unlock_irqrestore(&sem->lock, flags);
return result;
}
int __sched
down_interruptible(struct semaphore *sem)
{
#ifdef WAITQUEUE_DEBUG
CHECK_MAGIC(sem->__magic);
#endif
#ifdef CONFIG_DEBUG_SEMAPHORE
printk("%s(%d): down(%p) <count=%d> from %p\n",
current->comm, current->pid, sem,
atomic_read(&sem->count), __builtin_return_address(0));
#endif
return __down_interruptible(sem);
}
int down_interruptible(struct semaphore *sem)
{
unsigned long flags;
int result = 0;
spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;
else
result = __down_interruptible(sem);
spin_unlock_irqrestore(&sem->lock, flags);
return result;
}
/**
* down_interruptible - acquire the semaphore unless interrupted
* @sem: the semaphore to be acquired
*
* Attempts to acquire the semaphore. If no more tasks are allowed to
* acquire the semaphore, calling this function will put the task to sleep.
* If the sleep is interrupted by a signal, this function will return -EINTR.
* If the semaphore is successfully acquired, this function returns 0.
*/
int down_interruptible(struct semaphore *sem)
{
unsigned long flags;
int result = 0;
raw_spin_lock_irqsave(&sem->lock, flags);
#ifdef CONFIG_ILOCKDEP
ilockdep_acquire(&sem->idep_map, _RET_IP_, (void *)sem);
#endif
if (likely(sem->count > 0))
sem->count--;
else
result = __down_interruptible(sem);
#ifdef CONFIG_ILOCKDEP
if (result)
ilockdep_clear_locking(current);
else
ilockdep_acquired(&sem->idep_map, _RET_IP_, (void *)sem);
#endif
raw_spin_unlock_irqrestore(&sem->lock, flags);
return result;
}
