JPH0594316A - Information processor - Google Patents

Abstract

PURPOSE:To preferentially perform the use of the resources of the urgent task when plural tasks to share one power exist and the urgent task occurs. CONSTITUTION:An instruction interpreting part 2 to interpret the instruction of each task and judge whether it is the use starting instruction of resources or a use end instruction is provided. An operation number identifier 3 to store the prescribed value in correspondence to the resources is provided. An arithmetic part 4 to add 1 to the value of the operation number identifier 3 at the time of the use start instruction of the resources and subtract 1 at the time of the use end instruction is provided. When the value of the operation number identifier 3 after 1 is subtracted by the use end instruction of the resources is except '0,' an instruction sequencer 5 to perform the use processing to the resources of the previous task from a leading address is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus, and more particularly to an information processing apparatus having a function of sharing the same resource when a plurality of tasks are executed.

[0002]

2. Description of the Related Art Conventionally, in this type of information processing apparatus, when a plurality of tasks are executed and one task is executing a resource use process, another urgent task occurs and the resource is used. When processing, even if the control is switched to a more urgent task, it waits until the resource use processing for the resource that was being processed by the task before switching is completed, and preemption of resource processing is taken. I did not forgive.

[0003]

In the above-described conventional information processing apparatus, even if a task with a higher degree of urgency appears, preemption is not allowed for resource processing, and resource competition occurs when resource competition occurs. However, since they are executed in order, even if the task is an urgent task, there is a drawback that the resource processing is kept waiting.

An object of the present invention is to provide an information processing apparatus capable of preferentially using and processing a shared resource for a task of high urgency.

[0005]

An information processing apparatus of the present invention is an information processing apparatus that shares a resource when a plurality of tasks exist and each of these tasks is executed, An instruction interpretation unit that interprets and determines whether it is an instruction to start the use processing of the resource or an instruction to end the use processing of the resource, an operation number identifier that is provided corresponding to the resource and stores a predetermined value, and the instruction interpretation When the determination of the copy is an instruction to start the use processing of the resource, the value of the operation number identifier is 1
And an operation unit that subtracts 1 from the value of the operation number identifier when the instruction is an instruction to end the use processing of the resource, and after the use processing for the resource of the first task of the plurality of tasks is completed. , When the value of the operation number identifier is other than a preset value, the resource is processed from the start address of the resource use process of the second task which has used the resource before the first task. And an instruction sequencer for resuming usage processing.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

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

In this embodiment, an internal bus 1 and an instruction interpreter 2 for interpreting an instruction of each task from the internal bus 1 and determining whether it is an instruction to start a resource use process or an instruction to end a resource use process. , The operation number identifier 3 which is provided corresponding to the resource and stores a predetermined value, and when the instruction interpretation unit 2 judges that the resource use process is started, 1 is added to the value of the operation number identifier 3 Operation number identifier 3 when the instruction is a usage processing end
After the operation unit 4 that subtracts 1 from the value of and the use processing for the resource of one task of the plurality of tasks is completed,
The value of the operation number identifier is a preset value (for example, "0")
In other cases, the instruction sequencer 5 restarts the resource use process from the start address of the resource use process of the other task that has used the resource before the one task.

Next, the operation of this embodiment will be described.

Each instruction for task processing is interpreted by the instruction interpreting section 2 via the internal bus 1. Then, when it is interpreted that the use process for the resource is started, the contents (value) of the operation number identifier 3 corresponding to the resource is set to 1 by the arithmetic unit 4.
to add. When the instruction interpreting unit 2 interprets that the resource use processing is completed, the arithmetic unit 4 subtracts 1 from the content of the operation number identifier 3 corresponding to the resource. If the content of the operation number identifier 3 after decrementing by 1 is not "0", it means that the process for that resource has been nested. Therefore, the task that is using the resource before the currently executing task is processed. The instruction sequencer 5 is operated so as to transfer control to the processing for setting the restart address to the start address of the processing unit for operating this resource.

The determination of the degree of urgency is made by the central processing unit or the like, and the instruction of the task of high urgency is transmitted to the instruction interpreting unit 2 via the internal bus 1. At the same time, the central processing unit suspends the resource use processing of the task that has used the resource.

FIG. 2 shows the flow of control when the same resource A is used and processed when a first task that is using the resource A and a second task with a high degree of urgency occur in this embodiment. It is the flow chart shown.

First, the first task is executing the process P1 for the resource A (S1). At that time, the content of the operation number identifier 3 for the resource A is “1”.

On the way, an urgent second task appears,
The first task suspends its processing P1 during the processing of the resource A, and the control is transferred to the second task. When the process P2 for the resource A is started in the second task, the operation number identifier 3 of the resource A is incremented by 1 and becomes "2". When the process P2 for the resource A of the second task is completed, the resource A
The operation number identifier 3 of is subtracted by 1 and becomes "1" (S2).

At this time, the content of the operation number identifier 3 is "0".
Since it is not, it can be seen that the process P1 for the resource A was partially executed in the first task that was executed before the second task, and the restart of the process P1 for the resource A was resumed from where it was interrupted. Instead, it is set to trace back to the start address of the process P1 for the resource A and start over.
Then, the process P1 of the resource A of the first task is executed from the start address, and the process P1 of the resource A of the first task is executed.
To finish. At this time, the content of the operation number identifier 3 is decremented by 1 and becomes "0" (S3).

In this way, it becomes possible to perform a process of using a shared resource of a task with a high degree of urgency, and it is possible to end the process of using the same resource of a suspended task.

[0017]

As described above, according to the present invention, if the instruction of each task is the start instruction of the use processing of one resource, 1 is added to its content, and if it is the end instruction of the use processing, 1 is subtracted. When the usage process for the resource of one task is completed, if the content of the operation number identifier is other than the predetermined value (0), the usage process for the resource of the task before this completed task is performed. With the configuration that restarts from the start address, the shared resource can be preferentially used for the task with high urgency, and the use processing for the interrupted task for the same resource can be terminated. effective.

[Brief description of drawings]

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

FIG. 2 is a flow chart for explaining the operation of the embodiment shown in FIG.

[Explanation of symbols]

 1 Internal Bus 2 Instruction Interpreter 3 Operation Number Identifier 4 Operation Unit 5 Instruction Sequencer

Claims (1)

[Claims] 1. An information processing apparatus that shares a resource when there are a plurality of tasks and each of these tasks is executed. The information processing apparatus interprets the instruction of each task and starts the use processing of the resource. An instruction interpreting unit that determines whether it is an instruction to end the use processing of a resource, an operation number identifier that is provided corresponding to the resource and stores a predetermined value, and an instruction that the determination of the instruction interpreting unit starts the use processing of the resource And an operation unit for adding 1 to the value of the operation number identifier, and subtracting 1 from the value of the operation number identifier when the instruction is an instruction to end the use process of the resource, and a first of the plurality of tasks. After the use processing of the task for the resource is completed, when the value of the operation number identifier is other than a preset value, the second task of the second task that has used the resource before the first task is processed. Start of resource usage processing An information processing device, comprising: an instruction sequencer for restarting the processing of using this resource from a dress.