RE: Thread safety for epoll/libaio

David Schwartz
2006-03-01T03:49:27Z

They are thread safe.

> Thread A: while(1) { io_getevents(); ... }
> // wait forever until an event occurs, then handles the event and loop
>
> Thread B: while(1) { epoll_wait(); ... }
> // same as thread A
>
> Thread C: ... io_submit(); ...
>
> Thread D: ... epoll_ctl(); ....
>
> Suppose thread B calls epoll_wait and blocks before thread D calls
> epoll_ctl. Is it safe to do so? Will thread B be notified for the
> event submitted by thread D? Thread A and C pose the same question
> for AIO.

Using the interfaces this way is pretty much their entire point. They'd be
almost useless if you couldn't use them in this way.

DS