test_refcounts.py 文件源码

def test_callback(self):
        import sys
        try:
            from sys import getrefcount
        except ImportError:
            return unittest.skip("no sys.getrefcount()")

        proto = ctypes.CFUNCTYPE(ctypes.c_int, ctypes.c_int, ctypes.c_int)
        def func(a, b):
            return a * b * 2
        f = proto(func)

        gc.collect()
        a = sys.getrefcount(ctypes.c_int)
        f(1, 2)
        self.assertEqual(sys.getrefcount(ctypes.c_int), a)