bool silc_schedule_one(SilcSchedule schedule, int block);

    Same as the silc_schedule but runs the scheduler only one round
    and then returns.  This function is handy when the SILC scheduler
    is used inside some other external scheduler, for example.  If
    the `timeout_usecs' is non-negative a timeout will be added to the
    scheduler.  The function will not return in this timeout unless
    some other event occurs.