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代码说明：

  用以演示他提出的信号量机制。本作业要求设计在同一个进程地址空间内执行的两个线程。生产者线程生产物品，然后将物品放置在一个空缓冲区中供消费者线程消费。(For the presentation he made semaphore mechanism. Operational requirements of the design process in the same address space to implement the two threads. Thread the production of goods producers, and then the article should be placed in an empty buffer for consumers thread consumption.)