From: Thomas Kluyver <thomas@kluyver.me.uk>
Date: Tue, 31 Jan 2023 11:09:14 +0000 (+0000)
Subject: IOLoop.current(): create new asyncio loop if not already present
X-Git-Tag: v6.3.0b1~8^2~10
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c8f27ee4996b258708d06795854b98ae0accf776;p=thirdparty%2Ftornado.git

IOLoop.current(): create new asyncio loop if not already present
---

diff --git a/tornado/ioloop.py b/tornado/ioloop.py
index 8245d34a2..cad985396 100644
--- a/tornado/ioloop.py
+++ b/tornado/ioloop.py
@@ -254,10 +254,13 @@ class IOLoop(Configurable):
         """
         try:
             loop = asyncio.get_event_loop()
-        except (RuntimeError, AssertionError):
+        except RuntimeError:
             if not instance:
                 return None
-            raise
+            # Create a new asyncio event loop for this thread.
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+
         try:
             return IOLoop._ioloop_for_asyncio[loop]
         except KeyError: