From 945bf8ce1bf7ee3881752c2ecc129e35ab818477 Mon Sep 17 00:00:00 2001 From: Robsdedude Date: Fri, 13 Feb 2026 00:15:23 +0100 Subject: [PATCH] gh-144706: Warn against using synchronization primitives within signal handlers (GH-144736) --- Doc/library/signal.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst index d85d7138911..c3fe9943ba9 100644 --- a/Doc/library/signal.rst +++ b/Doc/library/signal.rst @@ -68,6 +68,11 @@ the synchronization primitives from the :mod:`threading` module instead. Besides, only the main thread of the main interpreter is allowed to set a new signal handler. +.. warning:: + + Synchronization primitives such as :class:`threading.Lock` should not be used + within signal handlers. Doing so can lead to unexpected deadlocks. + Module contents ---------------