Method pop

dali/util/thread_safe_queue.h:37–46

  }

  T pop() {
    std::unique_lock<std::mutex> lock{lock_};
    cond_.wait(lock, [&](){return !queue_.empty() || interrupt_;});
    if (interrupt_) {
      return {};
    }
    T item = std::move(queue_.front());
    queue_.pop();
    return item;
  }

  const T& peek() {
    return front();