info_threads (Debugger)

    # File cli/ruby-debug/commands/info.rb, line 353
        def info_threads(*args)
          ok, verbose = info_thread_preamble(args[0])
          return unless ok
          threads = Debugger.contexts.sort_by{|c| c.thnum}.each do |c|
            display_context(c, !verbose)
            if verbose and not c.ignored?
              (0...c.stack_size).each do |idx|
                print "\t"
                print_frame(idx, false, c)
              end
            end
          end
        end