[Zodb-checkins] SVN: ZODB/trunk/src/persistent/cPersistence.c Minor optimization in __getstate__ to avoid a needless dict allocation

[Jim Fulton]

Log message for revision 103109:
  Minor optimization in __getstate__ to avoid a needless dict allocation
  for objects that don't use slots, which are the vast majority of
  persistent objects.
  

Changed:
  U   ZODB/trunk/src/persistent/cPersistence.c

-=-
Modified: ZODB/trunk/src/persistent/cPersistence.c
===================================================================
--- ZODB/trunk/src/persistent/cPersistence.c	2009-08-23 14:34:05 UTC (rev 103108)
+++ ZODB/trunk/src/persistent/cPersistence.c	2009-08-23 15:29:26 UTC (rev 103109)
@@ -280,6 +280,12 @@
   slotnames = PyDict_GetItem(cls->tp_dict, py___slotnames__);
   if (slotnames)
     {
+      int n = PyObject_Not(slotnames);
+      if (n < 0)
+        return NULL;
+      if (n)
+        slotnames = Py_None;
+      
       Py_INCREF(slotnames);
       return slotnames;
     }