说明：  windows操作系统内核实验。读者写者问题。创建一个控制台进程。此进程包含n个线程。用这n个线程来表示n个读者或写者。每个线程按相应测试数据文件要求进行读写操作。用信号量机制分别实现读者优先和写者优先的读者-写者问题。
(windows operating system kernel experiment. Readers who write. Create a console process. This process contains n threads. With n threads n reader or writer. Each thread is required by the corresponding test data file read and write operations. Achieve the readers priority and write preferred reader- writer semaphore mechanism.)