virtual absl::Status AddDevices(
      std::vector<std::unique_ptr<Device>> devices) = 0;

  // Block until all pending nodes are finished.
  virtual absl::Status AsyncWait() = 0;

  // Add a function (serialized FunctionDef protocol buffer) so that it can
  // be executed as an op. Return error if the function with the same name
  // already exists.

#if defined(IS_MOBILE_PLATFORM)
  status->status = tensorflow::OkStatus();
#else   // !defined(IS_MOBILE_PLATFORM)
  status->status = tensorflow::unwrap(ctx)->AsyncWait();
#endif  // !IS_MOBILE_PLATFORM
}

void TFE_ContextSetThreadLocalDevicePlacementPolicy(
    TFE_Context* ctx, TFE_ContextDevicePlacementPolicy policy) {