Method test_changing_value

Lib/test/test_winreg.py:263–293

(self)

            self.assertEqual(h.handle, 0)

    def test_changing_value(self):
        # Issue2810: A race condition in 2.6 and 3.1 may cause
        # EnumValue or QueryValue to raise "WindowsError: More data is
        # available"
        done = False

        class VeryActiveThread(threading.Thread):
            def run(self):
                with CreateKey(HKEY_CURRENT_USER, test_key_name) as key:
                    use_short = True
                    long_string = 'x'*2000
                    while not done:
                        s = 'x' if use_short else long_string
                        use_short = not use_short
                        SetValue(key, 'changing_value', REG_SZ, s)

        thread = VeryActiveThread()
        thread.start()
        try:
            with CreateKey(HKEY_CURRENT_USER,
                           test_key_name+'\\changing_value') as key:
                for _ in range(1000):
                    num_subkeys, num_values, t = QueryInfoKey(key)
                    for i in range(num_values):
                        name = EnumValue(key, i)
                        QueryValue(key, name[0])
        finally:
            done = True
            thread.join()
            DeleteKey(HKEY_CURRENT_USER, test_key_name+'\\changing_value')
            DeleteKey(HKEY_CURRENT_USER, test_key_name)

    def test_queryvalueex_race_condition(self):
        # gh-142282: QueryValueEx could read garbage buffer under race