JP2004355384A - Task monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a task monitoring device capable of monitoring and controlling a task number or an execution step number required for analyzing a stop factor of a stopped task when detecting the stop of the task by a watchdog timer. <P>SOLUTION: The task monitoring device 1 provided with an OS having a multitask management function and a watchdog timer function is also provided with a task management table 10 in which the number of a task being executed at present and the number of a step being executed in each task are stored, a monitored task processing means for judging whether the watchdog timer is started within monitoring time or not, and a system stop processing means for displaying the contents of the task management table as an error log when the watchdog time is not started within the monitoring time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a task monitoring device, and more particularly, to a task monitoring device capable of specifying an abnormal portion of a task when a watchdog timer times out.
[0002]
[Prior art]
For example, in Patent Document 1, when detecting a program abnormality in a computer system, a multi-task operating system is used, and a flag operation performed by a task with the lowest task level at predetermined time intervals is performed on a task with the highest task level. An abnormality detection method is shown in which an abnormality of a program being executed in an intermediate level task is detected by monitoring.
[0003]
[Patent Document 1]
JP-A-63-280345
[Problems to be solved by the invention]
However, in the related art, when a stop of a task is detected by a watchdog timer, there is no function of monitoring and recording a task number or an execution step number required for analyzing a cause of stopping the stopped task. For this reason, it is not possible to specify the location that caused the abnormality.
[0005]
The present invention has been made in view of these problems, and when a task stop is detected by a watchdog timer, a task number or an execution step number required to analyze a cause of stop of the stopped task is determined. It is another object to provide a task monitoring device that can monitor, record, and display.
[0006]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
[0007]
A task monitoring device including an OS having a multitask management function and a watchdog timer function, the task management table storing a currently executed task number and an executed step number for each task, Monitoring task processing means for determining whether or not the watchdog timer has been activated within the monitoring time; and system stop processing means for displaying the contents of the task management table as an error log if the watchdog timer has not been activated within the monitoring time. With.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating a task monitoring device according to an embodiment of the present invention. In the figure, 1 is a task monitoring device, 10 is a task management table, 11 is an error log table, 12 is a watchdog timer, and 13 is a multitask OS. Reference numeral 14 denotes a plurality of monitored tasks, and in the example of the figure, consists of monitored tasks 1 to n.
[0009]
The monitoring task 16 uses the watchdog timer 12 to constantly monitor whether a plurality of monitored tasks (monitored tasks 1 to n) are operating normally.
[0010]
FIG. 2 is a diagram for explaining the details of the configuration of the task management table 10. In the figure, reference numeral 20 denotes a currently executed task number field, which stores the task number of the task currently being executed. Reference numeral 21 denotes a task execution step number column provided for each task, and stores a currently executed step number (execution step number) for each task (task 1 to task n). The information to be stored in the task management table 10 can be obtained from the multitask OS 13.
[0011]
FIG. 3 is a diagram for explaining the details of the configuration of the error log table 11. The error log table 11 can record a plurality of cases (first case to n-th case) for each monitored task that has detected a stop. In the figure, reference numeral 30 denotes an error log number assigned to each error that has occurred, 31 denotes a time stamp with an error occurrence time, 32 denotes an error code indicating the type of error, and 33 denotes an error message. Reference numeral 34 denotes an execution task number, which represents the task number of a task in which an error has occurred. An execution step number 35 indicates the execution step number of the task in which the error has occurred.
[0012]
FIG. 4 is a diagram for explaining the start-up process of the task monitoring device and the watchdog timer process for each monitoring task.
[0013]
First, in the startup processing of the task monitoring device, in step 41, the power of the task monitoring device 1 is turned on, the system of the task monitoring device is started, and a watchdog timer is generated. At this time, the watchdog timers are generated in a number corresponding to the number of monitored tasks. In step 42, an ID is assigned to each of the generated watchdog timers, and in step 43, the assigned ID is written in a common area of the memory with the monitored task.
[0014]
On the other hand, in the watchdog timer process for each monitored task, first, in step 44, the watchdog timer ID corresponding to the task to be monitored (monitored task) is determined from the watchdog timer IDs written in the common area. take in. In step 45, the system stop processing shown in FIG. 5 is registered in the acquired watchdog timer ID. As a result, when the time of the watchdog timer indicated by the watchdog timer ID has expired, the system is stopped. In step 46, the monitoring time (time-up time) is set in the watch dock timer represented by the ID, and in step 47, the watch dock timer represented by the ID is started. These processes are repeatedly executed by the number of monitored tasks.
[0015]
FIG. 5 is a diagram illustrating details of the monitoring task process and the system stop process. The monitoring task process is started at a predetermined cycle by the multitask OS. First, in step 53, it is determined whether or not the watchdog timer to which the ID is assigned for each monitored task is activated by the monitored task within the monitoring time set for each ID. When the monitored task is not started by the monitored task within the set monitoring time (for example, when the monitored task is in-loop (a process of repeatedly executing a closed loop) during the monitoring time set in step 46) or If the processing of the monitored task has been extended for the monitoring time or more, the process proceeds to step 54, where the system is stopped in step 54. If it is determined in step 53 that the watchdog timer has been activated by the monitored task within the monitoring time set by the watchdog timer, the process returns to step 53.
[0016]
On the other hand, in the system stop processing, in step 51, the contents of the task management table 10 shown in FIG. 2 are stored in the error log table 11 shown in FIG. 3, and in step 52, the system is set to a stopped state. Next, in step 43, the contents of the error log table are displayed on a screen, for example, a display screen of a display device connected to the task monitoring device 1.
[0017]
FIG. 6 is a diagram illustrating an example of an error log display format. As shown in the figure, the error display content includes an error log number 30, a time stamp 31, an error code 32, an error message 33, an execution task number 34, and an execution step number 35 of the error log table shown in FIG. .
[0018]
FIG. 7 is a diagram illustrating a display example of an error log. In this error log display example, the time when the error occurred, the content of the error, the execution task number, and the execution step number are displayed. For this reason, the user can check the task number that was being executed when the error occurred and the task execution step number.
[0019]
As described above, according to the present embodiment, in a multitask system in which a plurality of tasks operate simultaneously, when the stop of a task is detected by a watchdog timer, the task number and the execution step number of the stopped task are monitored. Can be recorded and displayed. For this reason, the cause of the task suspension can be quickly analyzed, and the reliability of the system can be improved.
[0020]
【The invention's effect】
As described above, according to the present invention, when a stop of a task is detected by a watchdog timer, a task number or an execution step number required to analyze a stop factor of the stopped task is monitored, recorded, and displayed. A task monitoring device that can perform the task monitoring can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a task monitoring device according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining details of a configuration of a task management table 10;
FIG. 3 is a diagram illustrating details of a configuration of an error log table 11;
FIG. 4 is a diagram for explaining a start-up process of the task monitoring device and a watchdog timer process for each monitoring task.
FIG. 5 is a diagram illustrating details of a monitoring task process and a system stop process.
FIG. 6 is a diagram showing an example of an error log display format.
FIG. 7 is a diagram illustrating a display example of an error log.
[Explanation of symbols]
1 Task Monitor 10 Task Management Table 11 Error Log Table 12 Watchdog Timer 13 Multitask OS
14 Monitored task 16 Monitoring task

Claims (2)

A task monitoring device including an OS having a multitask management function and a watchdog timer function,
A task management table storing the number of the currently executing task and the number of the executing step for each task;
Monitoring task processing means for determining whether a watchdog timer has been started within the monitoring time,
A task monitoring device, comprising: a system stop processing means for displaying the contents of a task management table as an error log when a watchdog timer is not started within a monitoring time. A task monitoring device including an OS having a multitask management function and a watchdog timer function,
A task management table storing the number of the currently executing task and the number of the executing step for each task;
An error log table that stores, as an error log, a task number and an execution step number for specifying an abnormal point when the watchdog timer times out, and determines whether the watchdog timer has been started within the monitoring time. Monitoring task processing means;
An error log table that stores the task number and execution step number as an error log when the watchdog timer times out, and the contents of the task management table if the watchdog timer is not started within the monitoring time And a system stop processing unit for writing an error log to the error log table and displaying the error log.

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