I am wondering about boost.asio. Boost.asio must have a proactor implementation on Linux, I guess.

How does the proactor of boost.asio work? Does it use epoll? Is it edge-triggered? What about real-time signal? Doesn't boost.asio use real-time signal on Linux?

What is the recommended implementation of boost.asio for asynchronous and non-blocking overlapped IO on Linux?

Thank you in advance!