What about edge-triggered notification?

From the article:

> AIO poll operations always operate in the "one-shot" mode

While "one-shot" isn't precisely the same thing as edge-triggered, they can largely be used with similar effect. If you want edge triggering and you have one-shot, you can arm a level-triggered one-shot listener and it will fire either immediately on the next "up" edge. Your application is in control of the "down" edge (i.e. you read all the data from the socket until you receive EAGAIN) and if you re-arm after that point, you effectively get notified of the next "up" edge in the same way that edge-triggered notification would.

The main differences are that (a) you have to explicitly re-arm and (b) you won't get extra notifications if you happen to get two edges while processing (i.e. if you drain all data from the socket but more comes in before you do another read and notice that the buffer is empty). The (a) point is a down-side, but (b) is pretty much essential if you want to poll for events from multiple threads, since you can otherwise end up with more than one thread trying to service the same active connection.