系统的同步机构采用信号量上的p、v操作的机制；控制机构包括阻塞和唤醒操作；时间片中断处理程序处理模拟的时间片中断；进程调度程序负责为各进程分配处理机。系统设计3个并发进程，它们之间有如下同步关系：3个进程需要互斥使用临界资源s2,进程1和进程2又需要互斥使用临界资源s1。系统在运行过程中随即打印各进程的状态变换过程，系统的调度过程及公共变量的变化情况。-system synchronization signal used agencies on the volume of p, v operation of the mechanism; Control agencies, including obstruction and awaken operation; Time Slice interrupt handling procedures-time simulation of interruption; The process scheduler is responsible for the allocation process processor. System design three concurrent process, and they are as follows synchronization : three processes require the use of critical resources contradict s2, a process and the need to process two mutually exclusive use of critical resources s1. System in the course of operation of the printing process was the transformation process of the state, the activation process variables and the public of the changes.