docs: 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