#11866: Eliminate race condition in the computation of names for new threads.
Original patch by Peter Saveliev.
diff --git a/Lib/threading.py b/Lib/threading.py
index 0438e1f..27a5511 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -11,6 +11,7 @@
import warnings
from collections import deque as _deque
+from itertools import count as _count
from time import time as _time, sleep as _sleep
from traceback import format_exc as _format_exc
@@ -623,11 +624,10 @@
self.__cond.release()
# Helper to generate new thread names
-_counter = 0
+_counter = _count().next
+_counter() # Consume 0 so first non-main thread has id 1.
def _newname(template="Thread-%d"):
- global _counter
- _counter = _counter + 1
- return template % _counter
+ return template % _counter()
# Active thread administration
_active_limbo_lock = _allocate_lock()