void silc_schedule_stop(SilcSchedule schedule);

    Stops the scheduler even if it is not supposed to be stopped yet.
    After calling this, one must call silc_schedule_uninit (after the
    silc_schedule has returned).  After this is called it is guaranteed
    that next time the scheduler enters the main loop it will be stopped.
    However, untill it enters the main loop it will not detect that
    it is stopped for example if this is called from another thread.