/**
* This function will release a semaphore, if there are threads suspended on
* semaphore, it will be waked up.
*
* @param sem the semaphore object
*
* @return the error code
*/
rt_err_t rt_sem_release(rt_sem_t sem)
{
register rt_base_t temp;
register rt_bool_t need_schedule;
#ifdef RT_USING_HOOK
if (rt_object_put_hook != RT_NULL) rt_object_put_hook(&(sem->parent.parent));
#endif
need_schedule = RT_FALSE;
/* disable interrupt */
temp = rt_hw_interrupt_disable();
#ifdef RT_IPC_DEBUG
rt_kprintf("thread %s releases sem:%s, which value is: %d\n", rt_thread_self()->name,
((struct rt_object*)sem)->name, sem->value);
#endif
if (sem->parent.suspend_thread_count > 0)
{
/* resume the suspended thread */
rt_ipc_object_resume(&(sem->parent));
need_schedule = RT_TRUE;
}
else sem->value ++; /* increase value */
/* enable interrupt */
rt_hw_interrupt_enable(temp);
/* resume a thread, re-schedule */
if (need_schedule == RT_TRUE) rt_schedule();
return RT_EOK;
}
/**
* This function will stop the timer
*
* @param timer the timer to be stopped
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*
*/
rt_err_t rt_timer_stop(rt_timer_t timer)
{
register rt_base_t level;
/* timer check */
RT_ASSERT(timer != RT_NULL);
if(!(timer->parent.flag & RT_TIMER_FLAG_ACTIVATED)) return -RT_ERROR;
#ifdef RT_USING_HOOK
if (rt_object_put_hook != RT_NULL) rt_object_put_hook(&(timer->parent));
#endif
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* change stat */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
/* remove it from timer list */
rt_list_remove(&(timer->list));
/* enable interrupt */
rt_hw_interrupt_enable(level);
return RT_EOK;
}
/**
* This function will release a mutex, if there are threads suspended on mutex,
* it will be waked up.
*
* @param mutex the mutex object
*
* @return the error code
*/
rt_err_t rt_mutex_release(rt_mutex_t mutex)
{
register rt_base_t temp;
struct rt_thread* thread;
rt_bool_t need_schedule;
need_schedule = RT_FALSE;
/* get current thread */
thread = rt_thread_self();
/* disable interrupt */
temp = rt_hw_interrupt_disable();
#ifdef RT_IPC_DEBUG
rt_kprintf("mutex_release:current thread %s, mutex value: %d, hold: %d\n",
thread->name, mutex->value, mutex->hold);
#endif
#ifdef RT_USING_HOOK
if (rt_object_put_hook != RT_NULL) rt_object_put_hook(&(mutex->parent.parent));
#endif
/* mutex only can be released by owner */
if (thread != mutex->owner)
{
thread->error = -RT_ERROR;
/* enable interrupt */
rt_hw_interrupt_enable(temp);
return -RT_ERROR;
}
/* decrease hold */
mutex->hold --;
/* if no hold */
if (mutex->hold == 0)
{
/* change the owner thread to original priority */
if (mutex->owner->init_priority != mutex->owner->current_priority)
{
rt_thread_control(mutex->owner, RT_THREAD_CTRL_CHANGE_PRIORITY,
&(mutex->owner->init_priority));
}
/* wakeup suspended thread */
if (mutex->parent.suspend_thread_count > 0)
{
/* get thread entry */
thread = rt_list_entry(mutex->parent.suspend_thread.next, struct rt_thread, tlist);
#ifdef RT_IPC_DEBUG
rt_kprintf("mutex_release: resume thread: %s\n", thread->name);
#endif
/* set new owner and priority */
mutex->owner = thread;
mutex->original_priority = thread->current_priority;
mutex->hold ++;
/* resume thread */
rt_ipc_object_resume(&(mutex->parent));
need_schedule = RT_TRUE;
}
else
{
