生产者与消费者问题是进程同步的经典问题，而进程同步是进程这章的重点。我们要通过编写生产者与消费者问题的程序加深关于进程同步的印象，巩固所学知识。-Producers and consumers of the problem is a classic problem of synchronization process, and the process of synchronization is the process the focus of this chapter. We want to p