JPS649543A - Abnormality detecting system for data processing system - Google Patents

Abstract

PURPOSE:To clearly decide the factors of the abnormality or an overload of a device by monitoring a task initiated at a constant period of the tasks constituting the system of a data processing system. CONSTITUTION:The respective tasks 10-12 are initiated at the constant period, for instance, at the period T to execute respective processings by a task control mechanism, respectively make access to a task initiation monitor flag buffer 13 to erect the flag of a corresponding bit position. A system monitor task 14 having the priority level of a higher order than the tasks 10-12 for processing a communication is initiated at the period about twice as long as the period T to inspect the state of the task initiation monitor flag buffer 13 and examine whether all the flags are '1' or not. According to this inspection, when the flags are completely '1', they are completely cleared to have '0' and at the time of NO, the entirely bit pattern of the flag is outputted to an external output device. Thereby, the mutual states of the plural flag bits are viewed, at which stage the abnormality is generated or the factor thereof can be discriminated based on the type of the task.