grpc_function_handle_is_ready_np - Checks whether the specified handle is ready or not
  grpc_error_t grpc_function_handle_is_ready_np(grpc_function_handle_t *handle)
  grpc_function_handle_t *handleThe grpc_function_handle_is_ready_np() function returns whether the specified handle is ready or not.
This function is MT-safe.
If the function handle is ready, GRPC_NO_ERROR is returned. In the case of an error, Error code is returned.
  GRPC_NOT_INITIALIZED  GRPC_INVALID_FUNCTION_HANDLE  GRPC_OTHER_ERROR_CODE