19:25 < tjafk2> desrt: now i understand what you're after. you want the 
                connect_object disconnect handler to be thread-safe. good 
                point, file a gnome bug about, should be worth fixing.

essentially, you should be able to call g_object_unref() on an object in one thread while a signal is being dispatched with that object as the argument in another thread.

either:

1) the signal should dispatch (with the signal handling code taking a reference)

or

2) nothing should happen (the closure is disabled before anything happens)

but never 

3) *boom*