Fix #39191: Don't spawn a task before failing (#17796)
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index adcdec1..e53ca73 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -573,14 +573,17 @@
except Exception as ex:
self.call_soon_threadsafe(future.set_exception, ex)
- def run_forever(self):
- """Run until stop() is called."""
- self._check_closed()
+ def _check_runnung(self):
if self.is_running():
raise RuntimeError('This event loop is already running')
if events._get_running_loop() is not None:
raise RuntimeError(
'Cannot run the event loop while another loop is running')
+
+ def run_forever(self):
+ """Run until stop() is called."""
+ self._check_closed()
+ self._check_runnung()
self._set_coroutine_origin_tracking(self._debug)
self._thread_id = threading.get_ident()
@@ -612,6 +615,7 @@
Return the Future's result, or raise its exception.
"""
self._check_closed()
+ self._check_runnung()
new_task = not futures.isfuture(future)
future = tasks.ensure_future(future, loop=self)