通过火车售票系统的事例来讲解利用互斥对象实现线程同步，对初学线程同步很有帮助-train ticketing system through the use of examples to explain Mutex object to synchronize threads, thread synchronization for beginners helpful

学习多线程编程，包括火车站售票系统模拟程序和网络聊天室程序-Learning multi-threaded programming, including the train station ticketing system simulation programs and Internet chat rooms program