asyncio, Tulip issue 171: BaseEventLoop.close() now raises an exception if the

event loop is running. You must first stop the event loop and then wait until
it stopped, before closing it.

1 files changed, 4 insertions, 0 deletions

diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 2f7f197..42d8b0b 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -247,7 +247,11 @@ class BaseEventLoop(events.AbstractEventLoop):
 
         This clears the queues and shuts down the executor,
         but does not wait for the executor to finish.
+
+        The event loop must not be running.
         """
+        if self._running:
+            raise RuntimeError("cannot close a running event loop")
         if self._closed:
             return
         self._closed = True