io_service object's event processing
loop to execute at most one handler.
std::size_t run_one( boost::system::error_code & ec);
function blocks until one handler has been dispatched, or until the
has been stopped.
The number of handlers that were executed. A zero return value implies
io_service object is stopped
Subsequent calls to
poll_one() will return immediately unless there
is a prior call to
The number of handlers that were executed.