| 摘要 |
PURPOSE:To reduce the loads of a system accompanying the identity of an internal state by guaranteeing the identity of the internal state with other program modules when it is judged that the internal state is changed and changing a check point cycle when the internal state is not changed. CONSTITUTION:An internal state monitoring part 7 judges whether or not the internal state is changed by an execution processing part 5 during a period from a previous check point to the check point at present. Then, when it is judged that the internal state of the program module is not changed, the cycle of the check point held at present is prolonged. On the other hand, when an internal state judgement part 7 judges that the internal state is changed, a check point cycle setting part 6 is informed so as to reset the check point cycle to a initial value, an internal state identity holding part 9 is activated and the internal state of a standby system program module is rewritten with the contents of the internal state of a main system program module. |
