GtkWindow destroy problem

[Martin Baulig <martin home-of-linux org>]

Hi,

the following code crashes:

====
    window = g_object_new (GTK_TYPE_WINDOW, NULL);

    g_object_unref (G_OBJECT (window));
====

Debugging shows me:

=====
g_object_unref (_object=0x80ee7d8) at gobject.c:1312
g_object_last_unref (object=0x80ee7d8) at gobject.c:421
gtk_window_dispose (object=0x80ee7d8) at gtkwindow.c:1363
gtk_widget_dispose (object=0x80ee7d8) at gtkwidget.c:5155
gtk_object_dispose (gobject=0x80ee7d8) at gtkobject.c:368
gtk_window_destroy (object=0x80ee7d8) at gtkwindow.c:2787
gtk_container_destroy (object=0x80ee7d8) at gtkcontainer.c:714
gtk_widget_real_destroy (object=0x80ee7d8) at gtkwidget.c:5174
gtk_object_real_destroy (object=0x80ee7d8) at gtkobject.c:388
=====

Now the object is finally dead.

When we return from the emission of the "destroy" signal in
gtk_object_dispose() (gtkobject.c:379), the object doesn't exist
anymore and it crashes:

====
gtk_object_dispose (gobject=0x80ee7d8) at gtkobject.c:379
379	      GTK_OBJECT_UNSET_FLAGS (object, GTK_DESTROYED);
====

Btw. changing the code to

====
    window = g_object_new (GTK_TYPE_WINDOW, NULL);

    gtk_object_destroy (GTK_OBJECT (window));
====

works just fine.

However, I still call this a serious bug - a GtkWindow is a GObject and
thus g_object_unref() on it must not crash.

This also causes some trouble in my guile bindings: I have a guile module
(gnome gobject) which doesn't know anything about Gtk+ but which knows how
to deal with GObjects. In the (gnome gtk) module, of course, I want to
re-use the GObject code from (gnome gobject) rather than implementing a whole
new datatype from GtkWidgets.

So in my code, creating and freeing the GtkWindow happens in a module which
doesn't link against Gtk+ at all.

-- 
Martin Baulig
martin gnome org (private)
baulig suse de (work)