这是操作系统课，期中考试的题目，用互斥信号量解决进程同步的问题-This is the OS class, the subject of the examination period, with the volume contradict signal synchronization process to resolve the problem

生产者消费者同步问题，用于模拟都线程的并行与互斥-Producer consumer synchronization, threads are used to simulate parallel and mutually exclusive