模拟实现动态高优先权优先（若数值越大优先权越高，每运行一个时间单位优先权-n，若数值越小优先权越高，没运行一个时间单位优先权+n）-Simulation of dynamic high-priority priority (higher priority if greater value per unit of time to run a priority-n, if the smaller the value, the higher the priority, the priority is not running a time unit+ n)