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ev provides an event loop for asynchronous I/O.

Start with [[newloop]] to create an event loop, then register files with it
using [[register]], or convenience functions like [[listen_tcp]]. Async
operations are provided such as [[read]], [[write]], and [[accept]]; each of
these schedules an I/O operation to be performed once the operating system is
ready to accept it without blocking. Users provide a callback to scheduling
functions which is called with the result of the I/O operation once completed.

Call [[ev::dispatch]] to process events for your event loop. This function will
return true until you call [[ev::stop]], providing a convenient means of exiting
the event loop from within callbacks. Thus, your core event loop might look like
this:

	for (ev::dispatch(&loop, -1)) void;