在Windows 2000 环境下，创建一个包含n 个线程的控制台进程。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的要求，进行读写操作。请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。-In Windows 2000 environment, create a console that contains the process of n threads. N threads with which to express n a reader or writer. Each thread according to the requirements of the corresponding test data files, reading and writing. Please use the semaphore mechanism is realized for the reader and the writer first priority of the reader- writer problem.