gh-94732: Fix KeyboardInterrupt race in asyncio run_forever() (#97765)
Ensure that the event loop's `_thread_id` attribute and the asyncgen hooks set by `sys.set_asyncgen_hooks()` are always restored no matter where a KeyboardInterrupt exception is raised.
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 2df9dca..66202f0 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -606,12 +606,13 @@ def run_forever(self):
self._check_closed()
self._check_running()
self._set_coroutine_origin_tracking(self._debug)
- self._thread_id = threading.get_ident()
old_agen_hooks = sys.get_asyncgen_hooks()
- sys.set_asyncgen_hooks(firstiter=self._asyncgen_firstiter_hook,
- finalizer=self._asyncgen_finalizer_hook)
try:
+ self._thread_id = threading.get_ident()
+ sys.set_asyncgen_hooks(firstiter=self._asyncgen_firstiter_hook,
+ finalizer=self._asyncgen_finalizer_hook)
+
events._set_running_loop(self)
while True:
self._run_once()
