It uses an ioctl that boils down to 'an overlapped version of poll()'. So the call doesn't block - instead when an event like POLLIN or POLLOUT happens, a completion is posted to the completion port.

Call this overlapped-poll function on every monitored socket individually so you don't inherit poll()s scalability problems.

See https://github.com/piscisaureus/wepoll/blob/437fb2f24ce197b4...

This is as much of an explanation I can type on my phone - I'll add more detail to the wepoll readme later.