def check_cpu_interval(self, cpu_process):
        """
        work-a-round for blocking input
        """
        try:
#            log.critical("check_cpu_interval()")
            if not cpu_process.is_alive():
                log.critical("raise SystemExit, because CPU is not alive.")
                _thread.interrupt_main()
                raise SystemExit("Kill pager.getch()")
        except KeyboardInterrupt:
            _thread.interrupt_main()
        else:
            t = threading.Timer(1.0, self.check_cpu_interval, args=[cpu_process])
            t.start()
work-a-round for blocking input