/**
* This function will control thread behaviors according to control command.
*
* @param thread the specified thread to be controlled
* @param cmd the control command, which includes
* RT_THREAD_CTRL_CHANGE_PRIORITY for changing priority level of thread;
* RT_THREAD_CTRL_STARTUP for starting a thread;
* RT_THREAD_CTRL_CLOSE for delete a thread.
* @param arg the argument of control command
*
* @return RT_EOK
*/
rt_err_t rt_thread_control(rt_thread_t thread, rt_uint8_t cmd, void *arg)
{
register rt_base_t temp;
/* thread check */
RT_ASSERT(thread != RT_NULL);
switch (cmd) {
case RT_THREAD_CTRL_CHANGE_PRIORITY:
/* disable interrupt */
temp = rt_hw_interrupt_disable();
/* for ready thread, change queue */
if (thread->stat == RT_THREAD_READY) {
/* remove thread from schedule queue first */
rt_schedule_remove_thread(thread);
/* change thread priority */
thread->current_priority = *(rt_uint8_t *)arg;
/* recalculate priority attribute */
#if RT_THREAD_PRIORITY_MAX > 32
thread->number = thread->current_priority >> 3; /* 5bit */
thread->number_mask = 1 << thread->number;
thread->high_mask = 1 << (thread->current_priority & 0x07); /* 3bit */
#else
thread->number_mask = 1 << thread->current_priority;
#endif
/* insert thread to schedule queue again */
rt_schedule_insert_thread(thread);
} else {
/**
* This function will delete a thread. The thread object will be removed from
* thread queue and detached/deleted from system object management.
*
* @param thread the thread to be deleted
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*
*/
rt_err_t rt_thread_delete(rt_thread_t thread)
{
rt_base_t lock;
/* thread check */
RT_ASSERT(thread != RT_NULL);
/* remove from schedule */
rt_schedule_remove_thread(thread);
/* release thread timer */
rt_timer_detach(&(thread->thread_timer));
/* change stat */
thread->stat = RT_THREAD_CLOSE;
/* disable interrupt */
lock = rt_hw_interrupt_disable();
/* insert to defunct thread list */
rt_list_insert_after(&rt_thread_defunct, &(thread->tlist));
/* enable interrupt */
rt_hw_interrupt_enable(lock);
return RT_EOK;
}
static void rt_thread_exit(void)
{
struct rt_thread *thread;
register rt_base_t level;
/* get current thread */
thread = rt_current_thread;
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* remove from schedule */
rt_schedule_remove_thread(thread);
/* change stat */
thread->stat = RT_THREAD_CLOSE;
/* remove it from timer list */
rt_list_remove(&(thread->thread_timer.list));
rt_object_detach((rt_object_t)&(thread->thread_timer));
if ((rt_object_is_systemobject((rt_object_t)thread) == RT_EOK) &&
thread->cleanup == RT_NULL) {
rt_object_detach((rt_object_t)thread);
} else {
/* insert to defunct thread list */
rt_list_insert_after(&rt_thread_defunct, &(thread->tlist));
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
/* switch to next task */
rt_schedule();
}
