Issue #13502: threading: Fix a race condition in Event.wait() that made it
return False when the event was set and cleared right after.
diff --git a/Lib/threading.py b/Lib/threading.py
index 043e6c8..fe92f10 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -418,9 +418,10 @@
def wait(self, timeout=None):
self._cond.acquire()
try:
- if not self._flag:
- self._cond.wait(timeout)
- return self._flag
+ signaled = self._flag
+ if not signaled:
+ signaled = self._cond.wait(timeout)
+ return signaled
finally:
self._cond.release()