在没有epoll_waiting的情况下是否会观看epoll事件(Are epoll events being watched when not epoll_waiting)

 我对基于事件的编程很新。 我正在试验epoll的边缘模式 ，它显然只能发出已经准备好进行读/写的信号（而不是水平模式，它会发出所有就绪文件的信号，无论是否已经准备就绪，或者只是准备就绪） 。 
 
 对我来说不清楚的是： 在边缘模式下，我是否知道在我不是epoll_wait发生的准备事件？ 那些尚未重新安装的一次性文件的事件怎么样？ 
 
 为了说明我提出这个问题的原因，请考虑以下情况： 
 
 
 
 有10个非阻塞套接字连接 
 
 
 配置epoll_ctl以在套接字准备好读取时做出反应，在edge-mode + oneshot中 ： EPOLLET | EPOLLONESHOT | EPOLLIN EPOLLET | EPOLLONESHOT | EPOLLIN 
 
 
 epoll_wait发生的事情（报告最多10个事件） 
 
 
 linux唤醒我的进程并报告套接字＃1和＃2已准备就绪 
 
 
 我read并处理数据套接字＃1（直到E_AGAIN ） 
 
 
 我read并处理数据套接字＃2（直到E_AGAIN ） 
 
 
 当我这样做时 ，套接字S接收数据 
 
 
 我处理了所有事件，因此我在EPOLL_CTL_MOD模式下使用epoll_ctl重新启动触发的文件，因为 
 
 
 我的循环回到epoll_wait下一批事件 
 
 
 好的，最后一个epoll_wait被告知socket S的准备情况吗？ 如果S是＃1（即它没有重新安装），会发生什么事？ 

I'm rather new to event based programming. I'm experimenting with epoll's edge-mode which apparently only signals files which have become ready for read/write (as opposed to level-mode which signals all ready files, regardless of whether there were already ready, or just became ready).
 
What's not clear to me, is: in edge-mode, am I informed of readiness events that happen while I'm not epoll_waiting ? What about events on one-shot files that haven't been rearmed yet ?
 
To illustrate why I'm asking that, consider the following scenario:
 
 
 
have 10 non-blocking sockets connected
 
 
configure epoll_ctl to react when the sockets are ready for read, in edge-mode + oneshot : EPOLLET | EPOLLONESHOT | EPOLLIN
 
 
epoll_wait for something to happen (reports max 10 events)
 
 
linux wakes my process and reports sockets #1 and #2 are ready
 
 
I read and process data socket #1 (until E_AGAIN)
 
 
I read and process data socket #2 (until E_AGAIN)
 
 
While I'm doing that, a socket S receives data
 
 
I processed all events, so I rearm the triggered files with epoll_ctl in EPOLL_CTL_MOD mode, because of oneshot
 
 
my loop goes back to epoll_waiting the next batch of events
 
 
Ok, so will the last epoll_wait always be notified of the readiness of socket S ? Event if S is #1 (i.e. it's not rearmed) ?

原文：https://stackoverflow.com/questions/31581918