* the return value of bsc_update_timers() is required for applications to find out if a timer was fired (Andreas Eversberg)
yesterday's crash with the llist_del instead of using del_timer was due this kind of bug. Add a test case.
One can use add_timer or schedule_timer to add a timer. After the timeout time has been reached the callback will be called. One can call add_time/schedule_timer and del_timer from within the callback.