diff --git a/Python/pystate.c b/Python/pystate.c
index d612d3a..99a01ef 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -403,7 +403,7 @@
     int64_t refcount = interp->id_refcount;
     PyThread_release_lock(interp->id_mutex);
 
-    if (refcount == 0) {
+    if (refcount == 0 && interp->requires_idref) {
         // XXX Using the "head" thread isn't strictly correct.
         PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
         // XXX Possible GILState issues?
@@ -413,6 +413,18 @@
     }
 }
 
+int
+_PyInterpreterState_RequiresIDRef(PyInterpreterState *interp)
+{
+    return interp->requires_idref;
+}
+
+void
+_PyInterpreterState_RequireIDRef(PyInterpreterState *interp, int required)
+{
+    interp->requires_idref = required ? 1 : 0;
+}
+
 _PyCoreConfig *
 _PyInterpreterState_GetCoreConfig(PyInterpreterState *interp)
 {
@@ -425,6 +437,16 @@
     return &interp->config;
 }
 
+PyObject *
+_PyInterpreterState_GetMainModule(PyInterpreterState *interp)
+{
+    if (interp->modules == NULL) {
+        PyErr_SetString(PyExc_RuntimeError, "interpreter not initialized");
+        return NULL;
+    }
+    return PyMapping_GetItemString(interp->modules, "__main__");
+}
+
 /* Default implementation for _PyThreadState_GetFrame */
 static struct _frame *
 threadstate_getframe(PyThreadState *self)
@@ -1370,7 +1392,7 @@
 static void _register_builtins_for_crossinterpreter_data(void);
 
 int
-_PyCrossInterpreterData_Register_Class(PyTypeObject *cls,
+_PyCrossInterpreterData_RegisterClass(PyTypeObject *cls,
                                        crossinterpdatafunc getdata)
 {
     if (!PyType_Check(cls)) {