解决有限缓冲区问题,用Win32提供的同步对象解决有限缓冲区问题,修改sm6.cpp，在它的基础上修改线程函数并予以控制。用一个Symbol区分线程类型，用事件对象实现线程互斥的运行

-To solve the problem with limited buffers, using Win32 synchronization objects to provide limited buffers to solve the problem, modify sm6.cpp, on the basis of changes in its function and be controlled by a thread. Symbol distinction with a thread type, use the event object implements the operation of the thread mutex