// most likely need to call `TF_FinishOperation` instead.
TF_CAPI_EXPORT extern TF_Operation* TF_FinishOperationLocked(
    TF_OperationDescription* desc, TF_Status* status);

// If this function succeeds:
//   * *status is set to an OK value,
//   * a TF_Operation is added to the graph,
//   * a non-null value pointing to the added operation is returned --
//     this value is valid until the underlying graph is deleted.

  /// keys in `num_keys`. Ownership of the buffers in `keys` are transferred to
  /// caller and needs to be freed using relevant filesystem allocation API.
  ///
  /// Plugins:
  ///   * Must set `status` to `TF_OK` on success. If there are no configurable
  ///     keys, `num_keys` should be set to 0
  ///   * Might use any other error value for `status` to signal other errors.
  ///
  /// DEFAULT IMPLEMENTATION: return `TF_OK` and `num_keys`=0.