On Tue, 2009-06-16 at 11:52 +0200, Jannis Pohlmann wrote: > I played with this a bit more and it seems it's not related to > GTypeModule all. Even if I make the GModule resident and never unuse > the GTypeModule, I still end up with this error. So the question is, is > GType or at least g_object_new() thread-safe? Or if it's not, shouldn't > it be?
For what it's worth, GStreamer uses GType/GObject in a heavily multithreaded context fairly successfully, so it should generally work just fine as long as you're aware of a few things: - you need to make sure your _get_type() functions are thread-safe (via g_once_init_enter/leave() or somesuch) - g_object_notify() and by extension g_object_set() are not thread-safe (yet) and bad things will happen if they are concurrently used on the same object+property. A fairly straight-forward patch for this issue is available in bugzilla [1], but is sadly still waiting for review. - you need to do locking internally in your object implementation as needed (e.g. for properties etc.) (hope I didn't forget anything) > Excerpt of the backtrace of the above error: > > #3 0xb7ec0f17 in g_assertion_message () > #4 0xb7ec14dd in g_assertion_message_expr () > #5 0xb7f6458f in g_type_class_ref () > #6 0xb7f49268 in g_object_newv () > #7 0xb7f497b1 in g_object_new_valist () > #8 0xb7f49920 in g_object_new () > > Any help would be greatly appreciated. Seems like I can reduce the risk > of this error to appear by protecting parts of my code with mutexes but > that still isn't 100% safe and it looks to me like this might be a bug > in GObject/GType. This looks a lot like the infamous bug #64764, which was fixed quite some time ago, however. What GLib version are you using? I think the fix made it into 2.16. If this is in fact the same issue, you can work around it by doing a g_type_class_ref(type) at the beginning of your code. Cheers -Tim [1] http://bugzilla.gnome.org/show_bug.cgi?id=166020#c61 _______________________________________________ gtk-devel-list mailing list gtk-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-devel-list
