/* Epoll private bits inside the event mask */#define EP_PRIVATE_BITS (EPOLLWAKEUP | EPOLLONESHOT | EPOLLET | EPOLLEXCLUSIVE)
主要是看下：惊群源：
1、socket wake_up all
2、epoll_wait 中wake_up all
epoll oneshot
原文：https://www.cnblogs.com/codestack/p/13040907.html
