Function rt_event_send

src/ipc.c:1966–2062

* @brief This function will send an event to the event object. * If there is a thread suspended on the event, the thread will be resumed. * * @note When using this function, you need to use the parameter (set) to specify the event flag of the event object, * then the function will traverse the list of suspended threads waiting on the event object. * If the

 *           If the return value is any other values, it means that the event detach failed.
 */
rt_err_t rt_event_send(rt_event_t event, rt_uint32_t set)
{
    struct rt_list_node *n;
    struct rt_thread *thread;
    rt_sched_lock_level_t slvl;
    rt_base_t level;
    rt_base_t status;
    rt_bool_t need_schedule;
    rt_uint32_t need_clear_set = 0;

    /* parameter check */
    RT_ASSERT(event != RT_NULL);
    RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event);

    if (set == 0)
        return -RT_ERROR;

    need_schedule = RT_FALSE;

    level = rt_spin_lock_irqsave(&(event->spinlock));

    /* set event */
    event->set |= set;

    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(event->parent.parent)));

    rt_sched_lock(&slvl);
    if (!rt_list_isempty(&event->parent.suspend_thread))
    {
        /* search thread list to resume thread */
        n = event->parent.suspend_thread.next;
        while (n != &(event->parent.suspend_thread))
        {
            /* get thread */
            thread = RT_THREAD_LIST_NODE_ENTRY(n);

            status = -RT_ERROR;
            if (thread->event_info & RT_EVENT_FLAG_AND)
            {
                if ((thread->event_set & event->set) == thread->event_set)
                {
                    /* received an AND event */
                    status = RT_EOK;
                }
            }
            else if (thread->event_info & RT_EVENT_FLAG_OR)
            {
                if (thread->event_set & event->set)
                {
                    /* save the received event set */
                    thread->event_set = thread->event_set & event->set;

                    /* received an OR event */
                    status = RT_EOK;
                }
            }
            else
            {