Function rt_wm_que_inc

components/vbus/watermark_queue.h:41–94

Increase the water level. * * It should be called in the thread that want to raise the water level. If the * current level is above the high mark, the thread will be suspended up to * @timeout ticks. * * @return RT_EOK if water level increased successfully. -RT_EFULL on @timeout * is zero and the level is above water mark. -RT_ETIMEOUT if timeout occurred. */

 * is zero and the level is above water mark. -RT_ETIMEOUT if timeout occurred.
 */
rt_inline rt_err_t rt_wm_que_inc(struct rt_watermark_queue *wg,
                                 int timeout)
{
    rt_base_t level;

    /* Assert as early as possible. */
    if (timeout != 0)
    {
        RT_DEBUG_IN_THREAD_CONTEXT;
    }

    level = rt_hw_interrupt_disable();

    while (wg->level > wg->high_mark)
    {
        rt_thread_t thread;

        if (timeout == 0)
        {
            rt_hw_interrupt_enable(level);
            return -RT_EFULL;
        }

        thread = rt_thread_self();
        thread->error = RT_EOK;
        rt_thread_suspend(thread);
        rt_list_insert_after(&wg->suspended_threads, &RT_THREAD_LIST_NODE(thread));
        if (timeout > 0)
        {
            rt_tick_t timeout_tick = timeout;
            rt_timer_control(&(thread->thread_timer),
                             RT_TIMER_CTRL_SET_TIME,
                             &timeout_tick);
            rt_timer_start(&(thread->thread_timer));
        }
        rt_hw_interrupt_enable(level);
        rt_schedule();
        if (thread->error != RT_EOK)
            return thread->error;

        level = rt_hw_interrupt_disable();
    }

    wg->level++;

    if (wg->level == 0)
    {
        wg->level = ~0;
    }

    rt_hw_interrupt_enable(level);

    return RT_EOK;
}

/** Decrease the water level.
 *