process

# File actionpack/lib/action_controller/metal/live.rb, line 273
    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.
      new_controller_thread {
        ActiveSupport::Dependencies.interlock.running do
          t2 = Thread.current

          # 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 }
          ActiveSupport::IsolatedExecutionState.share_with(t1)

          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
        end
      }

      ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
        @_response.await_commit
      end

      raise error if error
    end