Issue #23095, asyncio: IocpProactor.close() must not cancel pending
_WaitCancelFuture futures
diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index 5105426..3cb5690f 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -163,6 +163,9 @@
self._done_callback = None
+ def cancel(self):
+ raise RuntimeError("_WaitCancelFuture must not be cancelled")
+
def _schedule_callbacks(self):
super(_WaitCancelFuture, self)._schedule_callbacks()
if self._done_callback is not None:
@@ -693,6 +696,9 @@
# FIXME: Tulip issue 196: remove this case, it should not happen
elif fut.done() and not fut.cancelled():
del self._cache[address]
+ elif isinstance(fut, _WaitCancelFuture):
+ # _WaitCancelFuture must not be cancelled
+ pass
else:
try:
fut.cancel()