break;
    }
    status = RealRun(sess, enqueue_op, true);
    if (first_iteration) {
      if (!status.ok()) {
        mutex_lock l(mu_);
        enqueue_status_ = status;
      }
      counter_->DecrementCount();
      first_iteration = false;
    }
  }
  bool last_run = false;
  {
    mutex_lock l(mu_);
    runs_--;
    last_run = (runs_ == 0);
  }