JPH03256132A - Double task system device - Google Patents

Abstract

PURPOSE:To eliminate the system down time at the time of generation a fault in this double task system device by doubling a program for executing a certain processing. CONSTITUTION:When a processing requirement is outputted, an operation system (OS) 1 admits the use of plural tasks to execute the processing and starts the management of the tasks. At the time of recognizing the generation of a fault in the task #2-3, the OS 1 immediately disconnects the task #2-3 and sets up a waiting state in the task just preceding the task #2-3. During the period, the OS 1 develops a task having the same function as the task #2-3 from an external storage device 5 to a real memory 7 through an external bus 6. After completing the transfer, the execution of the task is started to continue the processing, so that the system can be prevented from being interrupted at the time of generating the fault.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information processing system that operates on a program, and more particularly to a dual task system that improves program processing within the system.

[Conventional technology]

Conventional devices of this type run a number of programs, or so-called tasks, to obtain results in order to accomplish a certain process.

[Problem to be solved by the invention]

As mentioned above, in conventional devices, multiple different tasks are activated to accomplish a process. In this case, when a fault occurs in a task, the processing results in a result with low reliability. Furthermore, in the worst case, a result is returned, leading to a so-called system failure.

[Means to solve the problem]

The dual task system device of the present invention has a function of discovering a task in which an abnormality has occurred and replacing it with another task having the same function.

That is, the dual-task system device of the present invention eliminates system downtime in the event of a failure by duplicating a program for implementing a certain process.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

In FIG. 1, 1 is the O8 unit that forms the core of the software of this system, and is responsible for managing each task and the system. 2 is the task (#), ), and 3 is the task (#2> , 4 is a task (#n), which exists under the control of the O3 department.

Now, suppose that this system receives a request for one process.

O81 accepts the use of multiple tasks to perform this process and starts managing them. Then, when it is recognized that a failure has occurred in task (#2) 3, that task (
#2) Separate 3.

Therefore, the task before the task (#2>3) enters the waiting state. During this time, the O81
A task that has the same function as the above is transferred from the external storage device 5 through the external bus 6 and expanded into the real memory 7. As soon as the transfer is complete, execute from this task and continue processing.

〔Effect of the invention〕

As explained above, the dual task system device of the present invention has the advantage that by duplicating tasks, it is possible to eliminate system interruption when a program failure occurs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1...O8, 2...Task (#1), 3...Task (#2)=4...Task (#n), 5...External storage device.

Claims (1)

[Claims] A dual task system device for an information processing system device, characterized in that a program for realizing a certain process is duplicated to eliminate system down time in the event of a failure.