线程的读者优先与写者优先。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。-priority threads with the readers who wrote priority. The process of creating a console, this process contain n threads. Use of these n threads to express n readers who write. Each thread according to the corresponding test data files and write. Using signal mechanism volume respectively priority and the readers who write to the readers to write priority problem.