Function SpawnReal

cpp/src/arrow/util/future_test.cc:1090–1095

    bool IsCurrentExecutor() override { return pool_->IsCurrentExecutor(); }

    Status SpawnReal(internal::TaskHints hints, internal::FnOnce<void()> task,
                     StopToken stop_token, StopCallback&& stop_callback) override {
      ++spawn_count;
      return pool_->Spawn(hints, std::move(task), std::move(stop_token),
                          std::move(stop_callback));
    }

    std::atomic<int> spawn_count{0};
    internal::Executor* pool_ = internal::GetCpuThreadPool();