使用CMutex 类实现线程同步，将了解到声明线程函数，定义全局变量m_Sec，程序睡眠10秒，锁定临界区，对临界区进行解锁，输出变量等知识点。

-Use CMutex class implements thread synchronization, thread function declaration will learn to define global variables m_Sec, program sleep for 10 seconds, lock the critical areas, critical areas of the unlock output variables such as knowledge points.