Lance Stout 70af52d74c Make one-off Callbacks ready for deletion after the prerun step.
Waiting until the actual run step means that the handler is not
marked for deletion when checked in the __spawn_event() thread,
causing the callback to stay in the handler list.
2011-02-13 16:28:06 -05:00
..
2010-10-06 14:20:32 -04:00