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test_refcounts.py
import unittest from test import support import ctypes import gc MyCallback = ctypes.CFUNCTYPE(ctypes.c_int, ctypes.c_int) OtherCallback = ctypes.CFUNCTYPE(ctypes.c_int, ctypes.c_int, ctypes.c_ulonglong) import _ctypes_test dll = ctypes.CDLL(_ctypes_test.__file__) class RefcountTestCase(unittest.TestCase): @support.refcount_test def test_1(self): from sys import getrefcount as grc f = dll._testfunc_callback_i_if f.restype = ctypes.c_int f.argtypes = [ctypes.c_int, MyCallback] def callback(value): #print "called back with", value return value self.assertEqual(grc(callback), 2) cb = MyCallback(callback) self.assertGreater(grc(callback), 2) result = f(-10, cb) self.assertEqual(result, -18) cb = None gc.collect() self.assertEqual(grc(callback), 2) @support.refcount_test def test_refcount(self): from sys import getrefcount as grc def func(*args): pass # this is the standard refcount for func self.assertEqual(grc(func), 2) # the CFuncPtr instance holds at least one refcount on func: f = OtherCallback(func) self.assertGreater(grc(func), 2) # and may release it again del f self.assertGreaterEqual(grc(func), 2) # but now it must be gone gc.collect() self.assertEqual(grc(func), 2) class X(ctypes.Structure): _fields_ = [("a", OtherCallback)] x = X() x.a = OtherCallback(func) # the CFuncPtr instance holds at least one refcount on func: self.assertGreater(grc(func), 2) # and may release it again del x self.assertGreaterEqual(grc(func), 2) # and now it must be gone again gc.collect() self.assertEqual(grc(func), 2) f = OtherCallback(func) # the CFuncPtr instance holds at least one refcount on func: self.assertGreater(grc(func), 2) # create a cycle f.cycle = f del f gc.collect() self.assertEqual(grc(func), 2) class AnotherLeak(unittest.TestCase): def test_callback(self): import sys proto = ctypes.CFUNCTYPE(ctypes.c_int, ctypes.c_int, ctypes.c_int) def func(a, b): return a * b * 2 f = proto(func) a = sys.getrefcount(ctypes.c_int) f(1, 2) self.assertEqual(sys.getrefcount(ctypes.c_int), a) if __name__ == '__main__': unittest.main()