Asynchronous and non-blocking IO
Asynchronous IO refers to an interface where you supply a callback to an IO operation, which is invoked when the operation completes. This invocation often happens to an entirely different thread to the one that originally made the request, but this is not necessarily the case. Asynchronous IO is a manifestation of the “proactor” pattern.
select、poll、epoll之间的区别总结[整理]
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