static extern void g_closure_add_finalize_notifier (IntPtr closure, IntPtr dummy, ClosureNotify notify);
static extern IntPtr g_cclosure_new (Delegate cb, IntPtr user_data, ClosureNotify notify);
static extern void g_closure_add_finalize_notifier(IntPtr closure, IntPtr dummy, ClosureNotify notify);
static extern IntPtr g_cclosure_new(Delegate cb, IntPtr user_data, ClosureNotify notify);
static extern IntPtr glibsharp_closure_new (ClosureMarshal marshaler, ClosureNotify notify, IntPtr gch);
static extern IntPtr glibsharp_closure_new(ClosureMarshal marshaler, ClosureNotify notify, IntPtr gch);