Issue #18808: Thread.join() now waits for the underlying thread state to be destroyed before returning.
This prevents unpredictable aborts in Py_EndInterpreter() when some non-daemon threads are still running.
diff --git a/Lib/_dummy_thread.py b/Lib/_dummy_thread.py
index 13b1f26..b67cfb9 100644
--- a/Lib/_dummy_thread.py
+++ b/Lib/_dummy_thread.py
@@ -81,6 +81,10 @@
raise error("setting thread stack size not supported")
return 0
+def _set_sentinel():
+ """Dummy implementation of _thread._set_sentinel()."""
+ return LockType()
+
class LockType(object):
"""Class implementing dummy implementation of _thread.LockType.