通过实现经典的读者写者问题，巩固对线程及其同步机制的学习效果，加深对相关基本概念的理解，并学习如何将基本原理和实际设计有机的结合。-through the realization of the classic problem of readers to write, and the consolidation of thread synchronization mechanism of the study results, related to deepen the understanding