多线程程序的编写，多线程应用中容易出现的问题。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。应用多线程编写网络聊天室程序。-Written in multithreaded programs, prone to the problem of multi-threaded applications. Mutex object to realize multi-thread synchronization. The use of named mutex object