多线程程序的编写，多线程应用中容易出现的问题。互斥对象的讲解，如何使用互斥对象来实现多线程的同步。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。-Writing multithreaded programs, multi-threaded applications prone to problems. Mutex object to explain how to use a mutex object to the multi-thread synchronization. How to use named mutex to ensure that only one instance of the application is running. Multi-threaded application program written in Internet chat rooms.