}

  void Cancel() override {}

  int NumThreads() const override {
    return underlying_threadpool_->NumThreads();
  }

  int CurrentThreadId() const override {
    return underlying_threadpool_->CurrentThreadId();
  }

  int GetNumScheduleCalled() { return num_schedule_called_; }

 private:
  int num_schedule_called_;

  void Schedule(std::function<void()> fn) override {
    tpool_.Schedule(std::move(fn));
  }

  int NumThreads() const override { return tpool_.NumThreads(); }
  int CurrentThreadId() const override { return tpool_.CurrentThreadId(); }
  void Cancel() override {}

 private:
  ThreadPool tpool_;
};
}  // namespace

RuntimeFallbackExecutor::RuntimeFallbackExecutor(int64_t num_threads)