diff --git a/Lib/threading.py b/Lib/threading.py
index 88101b0..d5412e9 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -798,6 +798,10 @@
 
 activeCount = active_count
 
+def _enumerate():
+    # Same as enumerate(), but without the lock. Internal use only.
+    return list(_active.values()) + list(_limbo.values())
+
 def enumerate():
     with _active_limbo_lock:
         return list(_active.values()) + list(_limbo.values())