Executing epoll_ctl in one thread while the other thread is in the middle of epoll_wait

I am new to linux server programming with epoll. I have 2 threads: Thread_Accept and Thread_epoll. The former is block accept loop, if new connection is coming, it will add the new fd with epoll_ctl()开发者_如何学Go. The latter is a big epoll_wait() loop.

Now my question is: What if when Thread_Accept executing epoll_ctl() while the Thread_epoll is in the middle of epoll_wait? Will it got any side effect?

Thanks in advance.

regards, Martin

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From the epoll_wait man page:

While one thread is blocked in a call to epoll_pwait(), it is possible for another thread to add a file descriptor to the waited-upon epoll instance. If the new file descriptor becomes ready, it will cause the epoll_wait() call to unblock.

So, no side effects when adding a new file descriptor :-)

(This man page note is the result of the bug mentioned by nathansizemore)

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Why don't you make it one thread?

You can set the listener socket to nonblocking and add the socket to your big epoll_wait

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From my experience, yes. But, this says otherwise