1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/asyncio/transports.py b/Lib/asyncio/transports.py
index 03099e3..9a6d919 100644
--- a/Lib/asyncio/transports.py
+++ b/Lib/asyncio/transports.py
@@ -19,6 +19,10 @@ class BaseTransport:
         """Get optional transport information."""
         return self._extra.get(name, default)
 
+    def is_closing(self):
+        """Return True if the transport is closing or closed."""
+        raise NotImplementedError
+
     def close(self):
         """Close the transport.