Margarita Manterola wrote:
> Hi!
>
> I've already submitted a bug, with the whole information about this,
> but I'm writting also to the list to see if someone has any idea of
> how to fix it.
>
> This is a problem with the C wrapper of gtk_window_list_toplevels for PyGTK.
>
> This is the reported bug:
> http://bugzilla.gnome.org/show_bug.cgi?id=574259 (it has stacktraces
> and the like)
>
> The problem is that in this code for _wrap_gtk_window_list_toplevels:
>
> static PyObject *
> _wrap_gtk_window_list_toplevels(PyGObject *self)
> {
> GList *list, *tmp;
> PyObject *py_list;
> PyObject *gtk_obj;
>
> list = gtk_window_list_toplevels();
>
> if ((py_list = PyList_New(0)) == NULL) {
> g_list_free(list);
> return NULL;
> }
> for (tmp = list; tmp != NULL; tmp = tmp->next) {
> gtk_obj = pygobject_new(G_OBJECT(tmp->data));
> if (gtk_obj == NULL) {
> g_list_free(list);
> Py_DECREF(py_list);
> return NULL;
> }
> PyList_Append(py_list, gtk_obj);
> Py_DECREF(gtk_obj);
> }
> g_list_free(list);
> return py_list;
> }
>
> The garbage collector is called while the code is in the for loop, it
> removes one of the toplevel windows which is not in use anywhere,
> except that it's already on the list, thus after the GC returns and
> the loop tries to access that removed window, it triggers a segfault.
>
> I can think of one ugly solution, but no correct solution. The ugly
> solution would be to add extra checks everywhere, so that if a window
> was destroyed in the middle of the function, everything would still
> work. The correct solution would be to somehow prevent the GC from
> destroying the unused window which is still in the list, but I have no
> idea how.
>
> Any ideas on how to fix it?
For a rather brute-force hack, you can do this:
import gtk, gobject
import gc
gc.disable()
def collect():
with gtk.gdk.lock:
gc.collect()
return True
gobject.timeout_add_seconds(10, collect)
Not a long-term solution, but it gets your software working.
--
Tim Evans
Applied Research Associates NZ
http://www.aranz.com/
_______________________________________________
pygtk mailing list pygtk@daa.com.au
http://www.daa.com.au/mailman/listinfo/pygtk
Read the PyGTK FAQ: http://faq.pygtk.org/
