garbage collection is a bit different on 3.11

- different refcount increment for calling a function
- __del__ is called in different circumstances

Author: minrk

zmq/sugar/context.py

@@ -81,7 +81,7 @@ def __repr__(self) -> str:
             _repr_cls = f"{cls.__module__}.{cls.__name__}"
 
         closed = ' closed' if self.closed else ''
-        if self._sockets:
+        if getattr(self, "_sockets", None):
             n_sockets = len(self._sockets)
             s = 's' if n_sockets > 1 else ''
             sockets = f"{n_sockets} socket{s}"

zmq/tests/test_message.py

@@ -37,9 +37,14 @@ def await_gc(obj, rc):
     Necessary because of the zero-copy gc thread,
     which can take some time to receive its DECREF message.
     """
+    # count refs for this function
+    if sys.version_info < (3, 11):
+        my_refs = 2
+    else:
+        my_refs = 1
     for i in range(50):
         # rc + 2 because of the refs in this function
-        if grc(obj) <= rc + 2:
+        if grc(obj) <= rc + my_refs:
             return
         time.sleep(0.05)