5 软件定时器线程优先级怎么通过代码设置？

rt_system_timer_thread_init();
    windoor_timer = rt_timer_create("timer1", windoor_timeout,
                             RT_NULL, 1000,
                             RT_TIMER_FLAG_PERIODIC  | RT_TIMER_FLAG_SOFT_TIMER);
    if( windoor_timer != RT_NULL && windoor_flag ==0 )
    {
        rt_timer_start( windoor_timer);
        windoor_flag = 1;
    }
    sidewindow_timer = rt_timer_create("timer2", sidewindow_timeout,
                             RT_NULL, 1000,
                             RT_TIMER_FLAG_PERIODIC |RT_TIMER_FLAG_SOFT_TIMER);
    if( sidewindow_timer != RT_NULL && sidewindw_flag == 0 )
    {
        //rt_kprintf("sidewindow_timer start\n");
        rt_timer_start( sidewindow_timer);
        sidewindw_flag = 1;
    }