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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.