def init_service_processes(self):
        """
        Prepare processes defined in the **settings.SERVICE_PROCESSES**.
        Return :class:`list` of the :class:`ProcessWrapper` instances.
        """
        processes = []

        for process_struct in getattr(
                self.context.config.settings, 'SERVICE_PROCESSES', ()):
            process_cls = import_object(process_struct[0])
            wait_unless_ready, timeout = process_struct[1], process_struct[2]

            self.logger.info("Init service process '%s'", process_cls.__name__)

            processes.append(
                ProcessWrapper(
                    process_cls, (self.context,),
                    wait_unless_ready=wait_unless_ready,
                    timeout=timeout
                )
            )

        return processes