bpo-30256: Add manager_owned keyword arg to AutoProxy (GH-16341)

Co-authored-by: Jordan Speicher <jordan@jspeicher.com>

Lib/multiprocessing/managers.py

@@ -967,7 +967,7 @@ def MakeProxyType(name, exposed, _cache={}):
 
 
 def AutoProxy(token, serializer, manager=None, authkey=None,
-              exposed=None, incref=True):
+              exposed=None, incref=True, manager_owned=False):
     '''
     Return an auto-proxy for `token`
     '''
@@ -987,7 +987,7 @@ def AutoProxy(token, serializer, manager=None, authkey=None,
 
     ProxyType = MakeProxyType('AutoProxy[%s]' % token.typeid, exposed)
     proxy = ProxyType(token, serializer, manager=manager, authkey=authkey,
-                      incref=incref)
+                      incref=incref, manager_owned=manager_owned)
     proxy._isauto = True
     return proxy
 

Lib/test/_test_multiprocessing.py

@@ -2286,6 +2286,16 @@ class _TestContainers(BaseTestCase):
         self.assertIsInstance(outer[0], list)  # Not a ListProxy
         self.assertEqual(outer[-1][-1]['feed'], 3)
 
+    def test_nested_queue(self):
+        a = self.list() # Test queue inside list
+        a.append(self.Queue())
+        a[0].put(123)
+        self.assertEqual(a[0].get(), 123)
+        b = self.dict() # Test queue inside dict
+        b[0] = self.Queue()
+        b[0].put(456)
+        self.assertEqual(b[0].get(), 456)
+
     def test_namespace(self):
         n = self.Namespace()
         n.name = 'Bob'

Misc/NEWS.d/next/Library/2019-09-25-13-54-41.bpo-30256.wBkzox.rst

@@ -0,0 +1 @@
+Pass multiprocessing BaseProxy argument `manager_owned` through AutoProxy

Misc/NEWS.d/next/Tests/2019-09-25-18-10-10.bpo-30256.A5i76Q.rst

@@ -0,0 +1,2 @@
+Add test for nested queues when using ``multiprocessing`` shared objects
+``AutoProxy[Queue]`` inside ``ListProxy`` and ``DictProxy``