def _py24_25_compat(self):
        """
        Python 2.4/2.5 have grave difficulties with threads/fork. We
        mandatorily quiesce all running threads during fork using a
        monkey-patch there.
        """
        if sys.version_info < (2, 6):
            # import_module() is used to avoid dep scanner.
            os_fork = import_module('mitogen.os_fork')
            mitogen.os_fork._notice_broker_or_pool(self)