clean_stop_errors_.insert(static_cast<int>(code));
    }
  }
}

Coordinator::~Coordinator() {
  RequestStop().IgnoreError();
  Join().IgnoreError();
}

Status Coordinator::RegisterRunner(std::unique_ptr<RunnerInterface> runner) {
  {
    mutex_lock l(mu_);
    if (should_stop_) {
      return Status(absl::StatusCode::kFailedPrecondition,
                    "The coordinator has been stopped.");
    }