_thread compatibility using frozen _dummy_thread

Lib/functools.py

@@ -18,10 +18,7 @@ from abc import get_cache_token
 from collections import namedtuple
 # import types, weakref  # Deferred to single_dispatch()
 from reprlib import recursive_repr
-try:
-    from _thread import RLock
-except ModuleNotFoundError:
-    from _dummy_thread import RLock
+from _thread import RLock
 from types import GenericAlias
 
 

Lib/reprlib.py

@@ -4,10 +4,7 @@ __all__ = ["Repr", "repr", "recursive_repr"]
 
 import builtins
 from itertools import islice
-try:
-    from _thread import get_ident
-except ModuleNotFoundError:
-    from _dummy_thread import get_ident
+from _thread import get_ident
 
 def recursive_repr(fillvalue='...'):
     'Decorator to make a repr function return fillvalue for a recursive call'

Lib/tempfile.py

@@ -47,10 +47,7 @@ import sys as _sys
 import types as _types
 import weakref as _weakref
 
-try:
-    import _thread
-except ImportError:
-    import _dummy_thread as _thread
+import _thread
 _allocate_lock = _thread.allocate_lock
 
 _text_openflags = _os.O_RDWR | _os.O_CREAT | _os.O_EXCL

Lib/zipfile.py

@@ -22,7 +22,7 @@ import sys
 try:
     import threading
 except ImportError:
-    import _dummy_thread as threading
+    import dummy_threading as threading
 import time
 import contextlib
 import pathlib

vm/Lib/python_builtins/_thread.py

@@ -0,0 +1 @@
+../../../Lib/_dummy_thread.py

vm/src/vm/mod.rs

@@ -233,6 +233,8 @@ impl VirtualMachine {
         let mut essential_init = || -> PyResult {
             #[cfg(not(target_arch = "wasm32"))]
             import::import_builtin(self, "_signal")?;
+            #[cfg(not(feature = "threading"))]
+            import::import_frozen(self, "_thread")?;
             let importlib = import::init_importlib_base(self)?;
             self.import_utf8_encodings()?;