Method run_in_child

Lib/test/_test_multiprocessing.py:5431–5443

(cls, start_method)

    @classmethod
    def run_in_child(cls, start_method):
        import json
        mp = multiprocessing.get_context(start_method)
        r, w = mp.Pipe(duplex=False)
        p = mp.Process(target=cls.run_in_grandchild, args=(w,))
        with warnings.catch_warnings(category=DeprecationWarning):
            p.start()
        grandchild_flags = r.recv()
        p.join()
        r.close()
        w.close()
        flags = (tuple(sys.flags), grandchild_flags)
        print(json.dumps(flags))

    def test_flags(self):
        import json