A comparation with mio

[tisonkun]

@notgull how do you compare polling with mio? I suppose this is a common tech decision topic ..

From my understanding, their supported features and API style are similar, while

• mio defines its own TcpListener and TcpStream type; polling uses std's ones.

Previously, polling define a plain-old Event struct but it's now almost the same wit mio's.

Anything else?

[notgull]

polling supports other modes of polling (oneshot mode and level triggered mode) and is also unsafe to use as it enforced I/O safety.

Generally mio is intended to be used standalone while polling is intended to be used as a lower level brick in a higher level API (such as async-io or calloop).