Issue #23865: close() methods in multiple modules now are idempotent and more
robust at shutdown. If needs to release multiple resources, they are released
even if errors are occured.
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 463d472..645a26f 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -285,9 +285,13 @@
         return conn
 
     def close(self):
-        self._socket.close()
-        if self._unlink is not None:
-            self._unlink()
+        try:
+            self._socket.close()
+        finally:
+            unlink = self._unlink
+            if unlink is not None:
+                self._unlink = None
+                unlink()
 
 
 def SocketClient(address):