Method WaitForIdle

cpp/src/arrow/util/thread_pool.cc:522–525

}

void ThreadPool::WaitForIdle() {
  std::unique_lock<std::mutex> lk(state_->mutex_);
  state_->cv_idle_.wait(lk, [this] { return state_->tasks_queued_or_running_ == 0; });
}

ThreadPool::ThreadPool()
    : sp_state_(std::make_shared<ThreadPool::State>()),