Fix make check with Python 2.7

diff --git a/src/runtime/PythonPorts.cxx b/src/runtime/PythonPorts.cxx
index 66e176e277a4c1b68d08521a7d29d12b9f6fae9c..a5ac5f4e70424e3400a4f9c51a086037b9bbf5c5 100644 (file)
--- a/src/runtime/PythonPorts.cxx
+++ b/src/runtime/PythonPorts.cxx
@@ -201,7 +201,10 @@ bool InputPyPort::isEmpty()
  */
 void InputPyPort::exSaveInit()
 {
-  Py_XDECREF(_initData); 
+  // Interpreter lock seems necessary when deleting lists in Python 2.7
+  PyGILState_STATE gstate = PyGILState_Ensure();
+  Py_XDECREF(_initData);
+  PyGILState_Release(gstate);
   _initData=_data;
   Py_INCREF(_initData); 
   DEBTRACE( "_initData.ob refcnt: " << _initData->ob_refcnt );