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Run the io_context
object's event processing loop to execute at most one handler.
count_type run_one();
The run_one() function blocks until one handler has been
dispatched, or until the io_context
has been stopped.
The number of handlers that were executed. A zero return value implies
that the io_context
object is stopped (the stopped() function returns true).
Subsequent calls to run(), run_one(), poll()
or poll_one() will return immediately unless there is a
prior call to restart().
Calling the run_one() function from a thread that is currently
calling one of run(), run_one(), run_for(),
run_until(), poll() or poll_one()
on the same io_context
object may introduce the potential for deadlock. It is the caller's reponsibility
to avoid this.