Run the io_service
object's event processing loop to execute at most one handler.
std::size_t run_one();
The run_one()
function blocks until one handler has been dispatched, or until the
io_service
has been stopped.
The number of handlers that were executed. A zero return value implies
that the io_service
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 reset()
.
Thrown on failure.