多线程程序的编写。采用互斥对象来实现多线程的同步。利用命名互斥对象保证应用程序只有一个实例运行。包括实例:应用多线程编写网络聊天室程序。-The preparation of multi-threaded process. Mutex object used to achieve simultaneous multi-threading. Use named mutex object to ensure that applications run only one instance. Inclu