加深对进程概念的理解，明确进程和程序的区别；进一步认识并发的实质；分析进程正由资源的现象，学习解决进程互斥的方法-Deepen the understanding of the concept of the process, a clear distinction between processes and procedures　a better understanding of the substance of concurrency　analyze the phenomenon of the process of being examined by the resources and learn ways to solve the process of mutually exclusive