How do you use AIO and epoll together in a single event loop?

Question

How can you combine AIO and epoll together in a single event loop?

Google finds lots of talk from 2002 and 2003 about unifying them, but its unclear if anything happened, or if it's possible.

Has anyone rolled-their-own with an epoll loop using eventfd for the aio signal?

Igniter

Realise this is very old question, but you could use 'signalfd' for the signal from aio – Madura

Are you referring to POSIX AIO or Linux AIO? The latter allows to register an eventfd for completion notifications. And that eventfd you could add to your epoll fd set. – Arel

Answer 1

try libevent:

http://www.monkey.org/~provos/libevent/

there are patches to support both.

Harsh

The new libeevent 2.0 is going completion-based: google-opensource.blogspot.com/2010/01/… - hopefully AIO will turn up as a backend so you can mix file and network descriptórs – Igniter

Answer 2

you can see http://www.xmailserver.org/eventfd-aio-test.c for a sample of aio and eventfd

Airboat

Interestingly, according to oxnz.github.io/2016/10/13/linux-aio now there is #include <linux/aio_abi.h> so there's no need to resort to __NR_io_setup – Towline

Answer 3

Tried eventfd with epoll?

"A key point about an eventfd file descriptor is that it can be monitored just like any other file descriptor using select(2), poll(2), or epoll(7)."

Kirkwood

Answer 4

FreeBSD supports AIO together with Kqueue, the AIO completion can be monitored by the Kqueue interface.

Kyle