commit 9746cda705decebc0ba572d95612796afd06dcd4
author Erlend Egeberg Aasland <erlend.aasland@innova.no> Fri Apr 30 16:04:57 2021 +0200
committer GitHub <noreply@github.com> Fri Apr 30 16:04:57 2021 +0200
tree d21d7082061099687919b8e744250bb39cf5613d
parent 387397f8a4244c983f4568c16a28842e3268fe5d

bpo-43916: Apply Py_TPFLAGS_DISALLOW_INSTANTIATION to selected types (GH-25748)

Apply Py_TPFLAGS_DISALLOW_INSTANTIATION to the following types:

* _dbm.dbm
* _gdbm.gdbm
* _multibytecodec.MultibyteCodec
* _sre..SRE_Scanner
* _thread._localdummy
* _thread.lock
* _winapi.Overlapped
* array.arrayiterator
* functools.KeyWrapper
* functools._lru_list_elem
* pyexpat.xmlparser
* re.Match
* re.Pattern
* unicodedata.UCD
* zlib.Compress
* zlib.Decompress

Modules/_threadmodule.c

diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
index 7feb0b8..6924d65 100644
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -312,7 +312,8 @@ static PyType_Slot lock_type_slots[] = {
 static PyType_Spec lock_type_spec = {
     .name = "_thread.lock",
     .basicsize = sizeof(lockobject),
-    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+              Py_TPFLAGS_DISALLOW_INSTANTIATION),
     .slots = lock_type_slots,
 };
 
@@ -683,7 +684,7 @@ static PyType_Slot local_dummy_type_slots[] = {
 static PyType_Spec local_dummy_type_spec = {
     .name = "_thread._localdummy",
     .basicsize = sizeof(localdummyobject),
-    .flags = Py_TPFLAGS_DEFAULT,
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
     .slots = local_dummy_type_slots,
 };