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Run the io_service
object's event processing loop to execute at most one handler.
std::size_t run_one( asio::error_code & ec);
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 restart().
The number of handlers that were executed.