process

# File actionpack/lib/action_controller/metal/live.rb, line 261
    def process(name)
      t1 = Thread.current
      locals = t1.keys.map { |key| [key, t1[key]] }

      error = nil
      # This processes the action in a child thread. It lets us return the
      # response code and headers back up the rack stack, and still process
      # the body in parallel with sending data to the client
      Thread.new {
        t2 = Thread.current
        t2.abort_on_exception = true

        # Since we're processing the view in a different thread, copy the
        # thread locals from the main thread to the child thread. :'(
        locals.each { |k,v| t2[k] = v }

        begin
          super(name)
        rescue => e
          if @_response.committed?
            begin
              @_response.stream.write(ActionView::Base.streaming_completion_on_exception) if request.format == :html
              @_response.stream.call_on_error
            rescue => exception
              log_error(exception)
            ensure
              log_error(e)
              @_response.stream.close
            end
          else
            error = e
          end
        ensure
          @_response.commit!
        end
      }

      @_response.await_commit
      raise error if error
    end