Kernel-Scheduler implementation

 const struct sched_class rt_sched_class = {
         .next                   = &fair_sched_class,
         .enqueue_task           = enqueue_task_rt,
         .dequeue_task           = dequeue_task_rt,
         .yield_task             = yield_task_rt,
 
         .check_preempt_curr     = check_preempt_curr_rt,（blank）
 
         .pick_next_task         = pick_next_task_rt,
         .put_prev_task          = put_prev_task_rt,（blank）
 
 #ifdef CONFIG_SMP
         .select_task_rq         = select_task_rq_rt,
 
         .set_cpus_allowed       = set_cpus_allowed_rt,
         .rq_online              = rq_online_rt,
         .rq_offline             = rq_offline_rt,
         .pre_schedule           = pre_schedule_rt,
         .post_schedule          = post_schedule_rt,
         .task_woken             = task_woken_rt,
         .switched_from          = switched_from_rt,
 #endif
 
         .set_curr_task          = set_curr_task_rt,
         .task_tick              = task_tick_rt,
 
         .get_rr_interval        = get_rr_interval_rt,
 
         .prio_changed           = prio_changed_rt,
         .switched_to            = switched_to_rt,
 };