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的要求进行读写操作。用信号量机制分别实现读者优先和写者优先问题。-Create a console process, this process contains n threads. Use of these n threads to represent n-reader or writer. Each thread according to the requirements of the corresponding test data file read and write operations. Semaphore mechanism are used to achieve the reader and the writer first priority.