Watchdog and implementing method thereof

Abstract

The embodiment of the invention provides a watchdog and an implementing method thereof. The watchdog comprises a hardware watchdog and a cascade software watchdog, wherein the cascade software watchdog at least comprises a first-stage software watchdog and a second-stage software watchdog. The input end of the hardware watchdog is in communication connection with the output end of the first-stagesoftware watchdog. The hardware watchdog is used for conducting zero clearing operation according to received zero clearing signals sent by the first-stage software watchdog within a preset time internal and monitoring the first-stage software watchdog. The input end of the first-stage software watchdog is in communication connection with the output end of the second-stage software watchdog. The first-stage software watchdog is used for conducting zero clearing operation according to received zero clearing signals sent by the second-stage software watchdog within a preset time interval and monitoring the second-stage software watchdog. When failures of an application stage are determined, there is no need to reboot a whole system, it is avoided that the work of other parts in the system ishindered and the system is forced to be stopped, and the stability of the whole system is ensured.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of system monitoring, and more specifically, relate to a watchdog and an implementation method thereof. Background technique [0002] In a microcomputer system, because the work is often disturbed by the external electromagnetic field, the program will run away or fall into an endless loop. s consequence. In order to monitor the running state of the computer system in real time, a chip or controller specially used to monitor the running state of the program in the computer system is produced, which is called "watchdog". [0003] At present, watchdogs can be divided into hardware watchdogs and software watchdogs. The hardware watchdog is essentially a timer circuit, which generally has an input terminal and an output terminal, where the input terminal is called feeding dog, and the output terminal is generally connected to the Micro-Controller Unit (MCU) in the computer system reset t...

AI Technical Summary

Problems solved by technology

But in general, the cause of the program failure may be only a problem in a certain part of the computer system, and it is not necessary to restart the entire computer system at this time

Restarting the entire computer system may hinder the work of other parts that can work normally and be forced to stop, which is not conducive to the stability of the entire computer system

At the same time, since the entire computer system includes a large number of programs, the time required for restarting the entire computer system will be greatly extended when the entire computer system is restarted, and data loss will also be caused.

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