JPH03191440A - Software monitoring system - Google Patents

Abstract

PURPOSE:To execute detailed software abnormal operation monitoring in each task by transmitting software monitoring information like a loop among respective tasks. CONSTITUTION:At the time of executing the software, the initially started task a5 starts a monitoring timer 8 and sends software monitoring information 2 to the succeeding task b6 and the task b6 receives and checks the software monitoring information sent from the preceding task a5 and then sends the software monitoring information to the succeeding task c7 so that the similar operation is repeated among respective tasks. If any one of the tasks 5 to 7 executes abnormal operation, the sending of the software monitoring information is interrupted, the monitoring timer 8 generates time-out and an alarm is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to software monitoring, and more particularly to a method for monitoring software for abnormal operations.

[Conventional technology]

Traditionally, this type of software monitoring method has been
A software command from one task restarts a timer that monitors the software, and normally the software command is issued at a timing when the timer would not time out, and when the timer times out, it is determined that the software has malfunctioned.

[Problem to be solved by the invention]

In the conventional software monitoring method described above, as long as the specified task that issues software instructions is operating normally, the timer can be restarted, so even if other tasks are operating abnormally, the abnormal operation cannot be detected. The drawback was that it could not be detected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a software monitoring method that can perform detailed monitoring of software abnormal operations on a task-by-task basis by repeatedly transmitting software monitoring information in a loop between each task.

[Means to solve the problem]

In the software monitoring method of the present invention, a hardware timer for monitoring normal software operation is started, and the next operation order task that receives the software monitoring information further passes the software monitoring information to the next task in a loop between each task. When the software monitoring information that has been repeatedly transmitted and circulated passes through the first task in the operating order, the hardware timer for monitoring the software normal operation is restarted, and an abnormality occurs due to the hardware timer's timeout. It has a function to detect motion.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 1 shows task a5, task b6, task c7, software monitoring information 2 sent by task a, software monitoring information 3 sent by task b, software monitoring information 4 sent out by task C, It consists of a timer restart signal 1 and a monitoring timer 8.

Task a5 sends a timer restart signal to monitoring timer 8, and at the same time sends software monitoring information 2 to task b6. When task b6 starts, it confirms that it has received software monitoring information 2 from task a5, and then sends software monitoring information 3 to task c7. Subsequently, when task c7 is activated, it similarly confirms that the software monitoring information 3 has been received, and then sends the software monitoring information 4 to task a5. When task a5 starts and confirms the reception of software monitoring information 4 from task c7, it outputs timer restart signal 1 and task b6
Output software monitoring information 2 to

On the other hand, the monitoring timer 8 that receives the timer restart signal 1 from the task a5 is reset and starts operating again.

In this way, when software is executed, the first task to start starts the monitoring timer and sends software monitoring information to the next task, and after confirming that the software monitoring information has been received from the previous task, the next task continues to the next task. The operation of sending the software monitoring information to the task is repeated between each task, and when the software execution passes the first task, the monitoring timer is partially reset and then restarted.

Note that if any task operates abnormally, the software monitoring information is interrupted and as a result, the monitoring timer is not reset by a predetermined time, so the monitoring timer times out and outputs an alarm to notify of abnormal software operation. .

〔Effect of the invention〕

As explained above, in order to monitor the normal operation of each task, the present invention transmits software monitoring information between each task in a loop, thereby performing detailed monitoring of the normal operation of software on a task-by-task basis. It has the effect of

FIG. 1 is a block diagram showing one embodiment of the present invention.

1... Timer restart signal, 2.3.4... Software monitoring information, 5... Task a, 6... Task b, 7
...Task C18...Monitoring timer.

Claims (1)

[Claims] In a device that monitors the operating status of software, in order to monitor the normal operation of each task, the task that is first in the operating order sends out software monitoring information and starts a hardware timer for monitoring the software normal operation, and the software monitors the software. The task in the next operating order that received the information sequentially transmits the software monitoring information to the next task, and when the software monitoring information that has gone around from the last task to the first task passes through the first task in the operating order. . A software monitoring method, characterized in that the hardware timer for monitoring normal software operation is restarted, and abnormal operation is detected when the hardware timer times out.