tidy code for asynchronous IO

Question

Whilst asynchronous IO (non-blocking descriptors with select/poll/epoll/kqueue etc) is not the most documented thing on the web, there are a handful of good examples.

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Answer 1

State machines are one nice approach. It's a bit of complexity up front that'll save you headaches in the future, where the future starts really, really soon. ;-)

Another method is to use threads and do blocking I/O on a single fd in each thread. The trade-off here is that you make I/O simple but may introduce complexity in synchronization.