利用多线程同步技术模拟电梯调度算法。主要用到了事件内核对象、临界区来让电梯服务线程、楼层请求正确地对请求队列进行访问、以及修改。-Simulation of elevator scheduling algorithm using thread synchronization techniques. Main event kernel object, a critical section is used to make service request threads, floors properly accessed, and modified the request queue.