[Python-Dev] epoll implementation

["Martin v. Löwis"]

Ross Cohen wrote:
> epoll also allows 64 bits of data to be tucked away and returned when events
> happen. Could be useful for saving a dict lookup for every event. However,
> there are some refcounting issues. Dict lookup per event could be traded
> for one on deregistration. All it needs is a small forward-compatible
> extension to the current select.poll API.

I don't understand. You only need the dictionary on registration, to
find out whether this is a new registration or a modification of an
existing one. How could you save the dict lookup at registration time?
And what would you store in the additional data?

Regards,
Martin