reinitialize an Event's Condition with a regular lock (closes #25319)

2 files changed, 9 insertions, 1 deletions

diff --git a/Lib/test/lock_tests.py b/Lib/test/lock_tests.py
index 42a7d82..462ecef 100644
--- a/Lib/test/lock_tests.py
+++ b/Lib/test/lock_tests.py
@@ -388,6 +388,14 @@ class EventTests(BaseTestCase):
         b.wait_for_finished()
         self.assertEqual(results, [True] * N)
 
+    def test_reset_internal_locks(self):
+        evt = self.eventtype()
+        old_lock = evt._cond._lock
+        evt._reset_internal_locks()
+        new_lock = evt._cond._lock
+        self.assertIsNot(new_lock, old_lock)
+        self.assertIs(type(new_lock), type(old_lock))
+
 
 class ConditionTests(BaseTestCase):
     """
diff --git a/Lib/threading.py b/Lib/threading.py
index 37aa3b8..80f809c 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -496,7 +496,7 @@ class Event:
 
     def _reset_internal_locks(self):
         # private!  called by Thread._reset_internal_locks by _after_fork()
-        self._cond.__init__()
+        self._cond.__init__(Lock())
 
     def is_set(self):
         """Return true if and only if the internal flag is true."""