test_multiprocessing.py 文件源码

def run_in_child(cls):
        import json
        r, w = multiprocessing.Pipe(duplex=False)
        p = multiprocessing.Process(target=cls.run_in_grandchild, args=(w,))
        p.start()
        grandchild_flags = r.recv()
        p.join()
        r.close()
        w.close()
        flags = (tuple(sys.flags), grandchild_flags)
        print(json.dumps(flags))