# File cli/ruby-debug/processor.rb, line 76
    def initialize(interface = LocalInterface.new)
      @interface = interface
      @commands  = []
      @display   = []
      
      @mutex = Mutex.new
      @last_cmd = nil
      @last_file = nil   # Filename the last time we stopped
      @last_line = nil   # line number the last time we stopped
      @debugger_breakpoints_were_empty = false # Show breakpoints 1st time
      @debugger_displays_were_empty = true # No display 1st time
      @debugger_context_was_dead = true # Assume we haven't started.
    end