Method IsUsefulToSwap

tensorflow/core/kernels/stack.cc:82–89

We don't swap the first tensor on the stack and any subsequent tensors that share the buffer with the first tensor.

  // We don't swap the first tensor on the stack and any subsequent tensors
  // that share the buffer with the first tensor.
  bool IsUsefulToSwap(const Tensor& tensor) const {
    mutex_lock l(mu_);
    if (stack_.empty()) {
      return false;
    }
    const Tensor& first = stack_.front().tensor;
    return !tensor.SharesBufferWith(first);
  }

  void Close() {
    mutex_lock l(mu_);