JPH06175863A - Restart circuit for task - Google Patents

Abstract

PURPOSE:To perform suitable dealing without continuing any abnormal state inside a device at the time of alarm generation and interrupting the processing of a normal system and to perform dealing corresponding to the frequency of an alarm to be changed by the operational environment of the device. CONSTITUTION:A restart judging function 20 decides a task to be restarted by judging alarm information 10 from a task group 3 based on contents previously registered on an alarm table 21. A restart synchronizing function 22 registers the task to be restarted on a processing request table 12 of an operating system (OS) 1. When the restart is requested, a restart setting function 23 outputs reset information 102 to an operating position storage table 12 of the OS 1 and reloads the operation restart position information with the leading position of the task. When the restart judging function 20 is not operated, an alarm table updating function 24 reloads the contents of the alarm table 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a task restart circuit, and more particularly to a task / device restart by an alarm generated when a plurality of tasks are arbitrated by an operating system in software / firmware.

[0002]

2. Description of the Related Art A program (task) that performs different processing passes a processing request for the next task that takes over the processing to the operating system when its own processing ends. At this time, if there is no processing request for the next task, the processing is simply transferred to the operating system.

As described above, in a system in which a plurality of tasks are arbitrated by the operating system to operate, there is a limit on the time during which one task can be processed continuously. When this time limit is exceeded, the operating system forcibly interrupts the processing and executes the processing of the next task.

The task whose processing has been completed, or the task whose processing has been forcibly interrupted by the operating system, sequentially executes the processing of other tasks by the operating system, and when the processing completes, the next position at which the processing is interrupted again. The process can be restarted from.

When an alarm occurs in any one of a plurality of tasks that make up the apparatus, the task generally continues processing, and the task dedicated to alarm determination takes the following measures.

That is, when the alarm does not seem to affect the operation, the task dedicated to alarm determination does nothing. If the alarm seems to affect operation,
The task dedicated to alarm determination restarts the entire device.

[0007]

In the prior art, even if a task in which an alarm has occurred is restored, it is impossible to determine what state other tasks affected by the alarm are in, so appropriate measures are taken. I can't
The abnormal state may continue in the device.

When the entire apparatus is restarted,
Even tasks that are performing normal processing are forcibly restarted, and normal processing is interrupted. In this case, the restart is forcibly performed during the process, which may adversely affect the external device.

Further, since the processing for the alarm is fixed only by restarting or not restarting the device, it is not possible to respond in accordance with the frequency of the alarm that changes depending on the operating environment of the device, and an incorrect response is taken. May go.

Therefore, it is an object of the present invention to take appropriate measures without causing an abnormal state in the device to continue when an alarm occurs, and without interrupting the processing of the normal system, and the operating environment of the device. The task is to provide a restart circuit for tasks that can respond according to the frequency of alarms that change.

[0011]

A task restart circuit according to the present invention is a task restart circuit in an information processing system in which a plurality of tasks each performing different processing operate under the control of an operating system.
A storage unit that stores in advance the importance of an alarm generated by the task and the range of influence of the plurality of tasks; and one of the plurality of tasks that corresponds to the alarm when an abnormality is detected and an alarm is generated. A determination unit that determines the restart range based on the contents of the storage unit; and a setting unit that sets the restart start position of the task that is determined to be the restart range by the determination unit to the head position of the task, The task determined to be in the restart range by the determination unit is restarted from the start position set by the setting unit.

[0012]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a conventional example, and FIG. 3 is a diagram showing a failure in the operation between tasks in the conventional example. It is a figure which shows an example.

2 and 3, the task T1 of the task group 3 is initialized by the activation information 101 from the task activation function 10 of the operating system (OS) 1 and then executes the process a. After executing the process a, the task T1 issues a process request 103 to the operating system 1 for the next task T2.

In operating system 1, task T
The processing request 103 from 1 is stored in the processing request table 12. In this case, the processing request table 12 stores the task T2 as the request destination and the task T1 as the request source.

Based on the information stored in the processing request table 12, the task starting function 10 of the operating system 1 sends the starting information 101 to the task T2 which has already been initialized and is operating, and requests the processing from the task T1. give. The task activation function 10 is the operation position storage table 1
Restart position xxx stored in 1 for each task T1 to Tn
x, yyyy, zzzz, ... And processing request table 1
Based on the information stored in 2 and the start information 10 in the task group 3
1 is sent, and the processing is executed in accordance with the processing request from task T1.
Tn Let each perform.

The task T2, which has received the processing request from the task T1, executes the processing b in accordance with the processing request. However, in the middle of the processing of the hardware (H / W) access, no response is returned from the hardware and the failure occurs. If an alarm occurs and an abnormal state (program infinite wait state, etc.) occurs, task T1 will continue to wait for a response from task T2.

The alarm generated in this task T2 is used as alarm information 104 in the task T which is an alarm judging device.
n is notified. The task Tn determines whether to wait for the alarm to spontaneously recover or to restart the entire device according to the generated alarm, and operates according to the determination result.

When the task T2 is recovered naturally, the task T
Whether 2 returns a response to task T1 depends on the recovery state of task T2. If the task T2 does not return a response to the task T1, the task T1 cannot exit the state of waiting for the response from the task T2 and becomes an abnormal state. Further, when the task Tn executes the restart of the entire apparatus, the tasks up to the normally operating task T3 are interrupted.

In FIG. 1, the restart determination function 20 of the restart circuit 2 according to the embodiment of the present invention is represented by the task group 3.
The alarm information 104 generated by each of the tasks T1, T2, T3, ... Is determined based on the contents registered in advance in the alarm table 21, and the task to be restarted is determined.

Here, the alarm table 21 stores a task to be restarted when each alarm occurs for each alarm type. For example, if the alarm type is "Alarm A", tasks T1 and T2 are restarted, if the alarm type is "Alarm B", task T3 is restarted, and if the alarm type is "Alarm C", the entire device is restarted. When the alarm type is "alarm D", information such as not restarting is stored in advance.

The restart synchronization function 22 confirms whether the task to be restarted determined by the restart determination function 20 is stored in the processing request table 12 of the operating system 1. In the restart synchronization function 22, the task to be restarted is the processing request table 12
If not, the task is additionally registered in the processing request table 12. The restart synchronization function 22 confirms that the task is not currently in operation, and if the task is in operation, postpones the restart of the task until the operation is completed.

When the restart setting function 23 requests the restart from the restart synchronization function 22, the restart setting function 23 outputs the reset information 102 to the operating position storage table 11 of the operating system 1. The operation position storage table 11 rewrites the stored operation restart position information to the head position (initialization process) of the task according to the reset information 102 from the restart setting function 23. By this, when the operating system 1 restarts the task, only the task can be restarted without affecting other tasks.

The alarm table updating function 24 operates in response to a start request from the external interface 4, and confirms whether or not the restart determination function 20 is operating without disturbing the operation of the device. If the restart determination function 20 is not operating, the alarm table updating function 24 rewrites the contents of the alarm table 21 based on the information from the external interface 4.

If the restart determination function 20 is in operation, the alarm table update function 24 waits until the operation of the restart determination function 20 is completed and the alarm table 2
Rewrite the contents of 1.

As described above, the importance of an alarm generated by a task and the influence range of a plurality of tasks are stored in advance in the alarm table 21, and the contents of the alarm table 21 corresponding to the alarm information 104 from the task group 3 are stored. Based on this, the restart determination function 20 determines the restart range, and the restart setting function 23 sets the restart start position of the task determined to be within this restart range, and then restarts the task. Thus, without stopping the normal task, only the abnormal task can be restarted and the device can be returned to the normal state in a short time as a whole.

In addition, the restart operation can be smoothly performed without hindering the movement of other tasks, and the restart information according to the frequency of the alarm that changes depending on the operating environment of the apparatus is registered even during the operation of the apparatus. Can be changed.

Therefore, when an alarm occurs, an appropriate measure can be taken without the abnormal state continuing in the device and without interrupting the processing of the normal system. In addition, it is possible to take measures corresponding to the frequency of alarms that change depending on the operating environment of the device. This makes it possible to improve the operating rate of the system.

[0029]

As described above, according to the present invention, the importance of an alarm generated by a task and the range of influence of a plurality of tasks are stored in advance, and one of the plurality of tasks detects an abnormality. When an alarm occurs, the restart range is determined based on the stored contents corresponding to the alarm, and the restart start position of the task determined to be within the restart range is set to the start position of the task and then restarted. By doing so, it is possible to take appropriate measures without an abnormal condition continuing in the device when an alarm occurs and without interrupting the processing of the normal system, and the alarm frequency that changes depending on the operating environment of the device There is an effect that it is possible to take a combined action.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a conventional example.

FIG. 3 is a diagram showing an example in which a failure occurs in the operation between tasks in the conventional example.

[Explanation of symbols]

 1 Operating System 2 Restart Circuit 3 Task Group 4 External Interface 11 Operating Position Storage Table 12 Processing Request Table 20 Restart Judgment Function 21 Alarm Table 22 Restart Synchronization Function 23 Restart Setting Function 24 Alarm Table Updating Function

Claims (3)

[Claims] 1. A restart circuit of a task in an information processing system, wherein a plurality of tasks each performing a different process operate under the control of an operating system, the importance of an alarm generated by the task, and the plurality of tasks. And a determination means for determining the restart range based on the contents of the storage means corresponding to the alarm when one of the plurality of tasks detects an abnormality and generates an alarm. Means and setting means for setting the restart start position of the task judged to be in the restart range by the judgment means to the head position of the task, and the task judged to be in the restart range by the judgment means. The task is characterized by restarting from the start position set by the setting means. Restart circuit. 2. The restart of a task according to claim 1, further comprising means for determining a restart timing of a task determined to be in the restart range by the determination means based on a processing request to the operating system. circuit. 3. The registration means for registering the degree of importance of the alarm and the range of influence of the plurality of tasks in the storage means according to the operating state of the determination means. Restart circuit for the listed task.