Method SpawnAddsThreaded

cpp/src/arrow/util/thread_pool_test.cc:555–559

  }

  void SpawnAddsThreaded(ThreadPool* pool, int nthreads, int nadds, AddTaskFunc add_func,
                         StopToken stop_token = StopToken::Unstoppable()) {
    DoSpawnAddsThreaded(pool, nthreads, nadds, std::move(add_func),
                        std::move(stop_token));
  }

  void SpawnAddsThreadedAndCancel(ThreadPool* pool, int nthreads, int nadds,
                                  AddTaskFunc add_func, StopSource* stop_source) {