def notify_readable
      data = @process.async_read(@stream_out)
      receive_data(data) if (data && data.length > 0)
      detach unless data
    end
def notify_readable
      data = @process.async_read(@stream_out)
      receive_data(data) if (data && data.length > 0)
      detach unless data
    end
=== Parameters
 @param [Process] process that was executed
 @param [Object] target defining handler methods to be called
 @param [Connector] stderr_eventable EM object representing stderr handler.
 @param [IO] stream_out as standard output stream
 Callback from EM to asynchronously read the stdout stream. Note that this
 callback mechanism is deprecated after EM v0.12.8 but the win32 EM code
 has never advanced beyond that point.