PV

代码说明：

说明：  ●实践目标  用Win32所提供的同步对象实现P、V操作，并使用它们并解决读写互斥问题。 ●实践内容 使用信号量对象或事件对象来实现方便(The goal of practice A synchronization object provided by Win32 P, V operation, and use them to read and write and solve the problem. The content of practice Using a signal object or event object to achieve the convenience)