多线程程序的编写，多线程应用中容易出现的问题。如何利用命名互斥对象保证应用程序只有一个实例运行。应用多线程编写网络聊天室程序。-Write multi-threaded programs, multi-threaded applications that can easily arise. How to use the named mutex to ensure only one instance of the application running. Multi-threaded applic