通俗易懂说多路复用(3)eventfd 事件通知
参考
https://www.cnblogs.com/zhengchunhao/p/5335914.html
https://blog.csdn.net/qq_28114615/article/details/97929524
https://www.cnblogs.com/zhengchunhao/p/5335914.html
https://blog.csdn.net/qq_28114615/article/details/97929524