编写一个程序，完成多个线程的创建，使得所创建的多线程在处理机上并发执行。通过本实验，学习在Win32程序中利用操作系统提供的API创建线程，并通过所创建线程的运行情况来获得关于多线程并发的感性认识，以及加深对临界资源(本实验中临界资源是屏幕)互斥访问的理解。(Write a program to complete the creation of multiple threads, so that the created multithreading is executed concurrently on the processor. Through this experiment, learn to use the operating system in the Win32 program in API to create threads, and through the operation of the thread is created to acquire perceptual knowledge about multiple threads, and deepen our understanding of the critical resources (the critical resources in this experiment is the exclusive access to the understanding of the screen).)