# File lib/hydra/master.rb, line 102
    def send_file(worker)
      f = @files.shift
      if f
        trace "Sending #{f.inspect}"
        @event_listeners.each{|l| l.file_begin(f) }
        worker[:io].write(RunFile.new(:file => f))
      else
        trace "No more files to send"
      end
    end