多线程编程之pthread_cond_wait、pthread_cond_signal

参考：

https://www.cnblogs.com/x_wukong/p/7909895.html

https://blog.csdn.net/paulkg12/article/details/84663378?utm_medium=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1

https://www.zhihu.com/question/24116967

https://www.cnblogs.com/wzheng/p/3753730.html

https://www.cnblogs.com/secondtonone1/p/5580203.html

https://blog.csdn.net/JISHUQIANJIA/article/details/80966620

http://www.360doc.com/content/10/1008/23/3700464_59462698.shtml