Method tearDownClass

Lib/test/_test_multiprocessing.py:7288–7317

(cls)

    @classmethod
    def tearDownClass(cls):
        # only the manager process should be returned by active_children()
        # but this can take a bit on slow machines, so wait a few seconds
        # if there are other children too (see #17395)
        timeout = WAIT_ACTIVE_CHILDREN_TIMEOUT
        start_time = time.monotonic()
        for _ in support.sleeping_retry(timeout, error=False):
            if len(multiprocessing.active_children()) <= 1:
                break
        else:
            dt = time.monotonic() - start_time
            support.environment_altered = True
            support.print_warning(f"multiprocessing.Manager still has "
                                  f"{multiprocessing.active_children()} "
                                  f"active children after {dt:.1f} seconds")

        gc.collect()                       # do garbage collection
        if cls.manager._number_of_objects() != 0:
            # This is not really an error since some tests do not
            # ensure that all processes which hold a reference to a
            # managed object have been joined.
            test.support.environment_altered = True
            support.print_warning('Shared objects which still exist '
                                  'at manager shutdown:')
            support.print_warning(cls.manager._debug_info())
        cls.manager.shutdown()
        cls.manager.join()
        cls.manager = None

        super().tearDownClass()


class ThreadsMixin(BaseMixin):