diff options
| -rw-r--r-- | Lib/multiprocessing/sharedctypes.py | 4 | ||||
| -rw-r--r-- | Lib/test/test_multiprocessing.py | 15 | ||||
| -rw-r--r-- | Misc/NEWS | 4 |
3 files changed, 22 insertions, 1 deletions
diff --git a/Lib/multiprocessing/sharedctypes.py b/Lib/multiprocessing/sharedctypes.py index e83ce58..1e694da 100644 --- a/Lib/multiprocessing/sharedctypes.py +++ b/Lib/multiprocessing/sharedctypes.py @@ -80,7 +80,9 @@ def RawArray(typecode_or_type, size_or_initializer): type_ = typecode_to_type.get(typecode_or_type, typecode_or_type) if isinstance(size_or_initializer, int): type_ = type_ * size_or_initializer - return _new_value(type_) + obj = _new_value(type_) + ctypes.memset(ctypes.addressof(obj), 0, ctypes.sizeof(obj)) + return obj else: type_ = type_ * len(size_or_initializer) result = _new_value(type_) diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py index f4031de..1136ab2 100644 --- a/Lib/test/test_multiprocessing.py +++ b/Lib/test/test_multiprocessing.py @@ -914,6 +914,21 @@ class _TestArray(BaseTestCase): self.assertEqual(list(arr[:]), seq) @unittest.skipIf(c_int is None, "requires _ctypes") + def test_array_from_size(self): + size = 10 + # Test for zeroing (see issue #11675). + # The repetition below strengthens the test by increasing the chances + # of previously allocated non-zero memory being used for the new array + # on the 2nd and 3rd loops. + for _ in range(3): + arr = self.Array('i', size) + self.assertEqual(len(arr), size) + self.assertEqual(list(arr), [0] * size) + arr[:] = range(10) + self.assertEqual(list(arr), list(range(10))) + del arr + + @unittest.skipIf(c_int is None, "requires _ctypes") def test_rawarray(self): self.test_array(raw=True) @@ -10,6 +10,10 @@ What's New in Python 3.1.4? Core and Builtins ----------------- +- Issue #11675: multiprocessing.[Raw]Array objects created from an integer size + are now zeroed on creation. This matches the behaviour specified by the + documentation. + - Issue #8651: PyArg_Parse*() functions raise an OverflowError if the file doesn't have PY_SSIZE_T_CLEAN define and the size doesn't fit in an int (length bigger than 2^31-1 bytes). |