说明：  实现了一个多线程工作组应用程序,此程序中使用了互斥对象，条件变量进行线程的控制。通过研究此程序，可以深刻理解线程的工作机理。
(achieve a working group multithreaded applications, the use of this procedure the mutex object, variable conditions thread control. Research through this procedure, a profound understanding of the working mechanism of thread.)