JPH03260840A - Bank memory control system for multi-task - Google Patents

Abstract

PURPOSE:To attain the switching even to a task included in a bank memory different from its own one by providing a memory which stores previously a table corresponding a task and bank memory, referencing to the table when the switch of tasks is carried out by an interruption and switching a task to a bank memory corresponding to the task of the switching destination. CONSTITUTION:A dispatch processing part is provided with a memory 31 storing previously a task-bank memory table. When the tasks are switched to each other, a bank memory is switched to another corresponding to the task of the switching destination by referencing to the table of the memory 31. Thus a task switching dispatch processing part switches the bank memories together with the switch of tasks which is carried out by an interruption. Thus a task can be also switched to another included in a bank memory different from its own memory.

Description

[Detailed Description of the Invention] [Summary] A multitasking programmer effect that stores a plurality of tasks into which a processing program of a computer system is divided, respectively, in a predetermined bank memory, and processes the plurality of tasks in parallel by switching them in a dispatch processing unit. Regarding bank memory in multitasking, the dispatch processing unit for task switching also switches bank memory when switching tasks due to an interrupt, making it possible to switch to a task in a bank memory other than its own memory. For the purpose of a control system, the dispatch processing unit is equipped with a memory ROM that stores a correspondence table between tasks and bank memory in advance, and when switching tasks due to an interrupt, the table in the memory ROM is referred to and the task to be switched to is changed. The configuration is configured to switch to the corresponding bank memory.

[Industrial application field]

The present invention aims to improve the efficiency of computer system processing.
This method relates to multitask programming in which multiple tasks (multitasking) in which a processing program is divided is held in a block of memory (bank memory) and processed in parallel, and in particular, a method of controlling bank memory when interrupting processing from an external source. Regarding.

As the amount of program memory used in computer systems increases, a method is sometimes adopted to expand the program memory by adding multiple bank memories to the computer's main memory, but in the case of multi-task programming. Since a plurality of tasks exist across a plurality of bank memories, it is necessary to control the bank memories when switching processing from a task consisting of an interrupt to another task.

[Conventional technology]

Methods for expanding program memory in a computer system include adding an external storage device such as a floppy disk in addition to the main memory and loading the program into the main memory as needed, and adding bank memory to the main memory. However, if the system does not have an external storage device, the method of adding bank memory to the main memory is often adopted. C with function
When using PU in a system, there is no need to be aware of bank memory switching, but PU does not have a bank control function.
When using pυ, it was necessary to consciously design the bank memory so that it could be switched by the user's program.

[Problem to be solved by the invention]

However, in the conventional bank memory control method in multitask programming, for example, in a conventional system that performs the operation shown in the explanatory diagram of FIG. When it is necessary to switch a task from task 1 to another task 2, if the task 2 to which the task is to be switched is located in a bank memory 12 that is different from the bank memory 11 that owns the task l currently being processed, the dispatch Since the processing unit 20^ does not have a switching function in bank memory units, bank memory 1
It is not possible to batch (task switch) task 2 in task 2. Therefore, task switching is performed in bank memory ll, and the task goes out of control within self 11, and self 11
This results in the destruction of the execution address stack, etc. Further, task l in bank memory ll is stored in bank memory 12.
Since it is not possible to predict the occurrence of a factor that causes task switching to task 2 in the bank memory 12, it is not possible to control the switching to task 2 in the bank memory 12.The problem of the present invention is to When the dispatch processing unit switches tasks due to an interrupt, it also switches the bank memory,
An object of the present invention is to provide a bank memory control method in multitasking that enables task switching to a task in a bank memory different from its own memory.

[Means to solve the problem]

As shown in FIG. 1, the dispatch processing unit 20 is equipped with a memory ROM 31 that stores in advance a correspondence table between tasks and bank memories indicating which task number belongs to which bank memory. This problem is solved by the structure of the present invention, which is provided with a bank switching section 30 that refers to a table in the memory ROM 31 and switches to a bank memory corresponding to the task to which the task is to be switched, when a task is switched due to a task.

In the principle diagram of FIG. 1 showing the basic configuration of the bank memory control method in multitasking of the present invention, 1 to n are tasks inside each of the plurality of bank memories 11 to 1n.

Reference numeral 10 denotes a bank memory section, which is composed of a plurality of bank memories 11=1n.

Reference numeral 20 denotes a task switching dispatch processing unit, which performs task switching from one task to another upon activation from an external interrupt processing unit 40.

30 is a bank switching unit provided in the dispatch processing unit 20, and the tasks 1 to n and the bank memory 11 are stored therein.
Memory RO that stores in advance the correspondence of ~1n as a table
When the dispatch processing unit 20 switches tasks due to an interrupt from the outside, it refers to the table in the memory 1JROM 31 and switches to the bank memory corresponding to the task to be switched.

40 indicates that the CPU
This is an interrupt processing section that is controlled by the bank switching section 30 and sends an activation command to the bank switching section 30.

[Effect]

In the present invention, the task switching dispatch processing unit 20
In response to a startup command from an external interrupt processing unit 40, task 1 in bank memory 11 is transferred to another bank memory 12.
When switching the task to task 2 in the dispatch processing section 20, first, the bank switching section 30 inside the dispatch processing section 20 performs the task based on the correspondence table between the tasks 1 to n and the bank memories 11 to 1n stored in advance in the memory ROM 31. to switch to the desired bank memory 12.

Therefore, the bank memory control method in multitasking according to the present invention can
Even if the switching destination task 2 is in a bank memory 12 different from the bank memory ll to which the task 1 currently being processed belongs,
The problem is solved because task switching by the dispatch processing unit 20 becomes possible.

〔Example〕

The principle diagram in FIG. 1 is a block diagram showing the configuration of a bank memory control method in multitasking according to an embodiment of the present invention, and FIG. 2 is a flow diagram of dispatch processing to explain its operation. .

In the flowchart shown in FIG. 2, the dispatch processing unit 20 shown in FIG. It is started by.

The dispatch processing unit 20 stores information in advance in the memory ROM 31 of the internal bank switching unit 30 as shown in FIG. 2, which task belongs to which bank memory.

It is kept as a table, and when the task switching factor occurs, the bank in which the switching destination task is located is obtained from the table.

For example, if the switching destination task 2 is in a bank memory 12 different from the bank memory 11 of task 1 currently being processed, the bank switching is first performed to that bank memory 12, and then the switching to task 2 is performed. I do.

Therefore, in the bank memory control method in the multitasking according to the embodiment of the present invention shown in FIG. Even if the task is in a bank memory 12 different from 11, there is no problem because task switching can be performed by the dispatch processing unit 20.

[Effects of the Invention] As explained above, according to the present invention, when performing task switching dispatch processing in multi-task programming, by first switching to the bank memory holding the switching destination task, Since it is also possible to switch to a task in another bank memory, a plurality of tasks can be placed in a plurality of bank memories, and the effect of facilitating expansion of the program memory can be obtained.

[Brief explanation of drawings]

Fig. 1 is a principle diagram showing the basic configuration of the bank memory control method in multitasking of the present invention, Fig. 2 is a flow diagram of dispatch processing to explain the operation of the embodiment of the present invention, and Fig. 3 is a conventional diagram. FIG. 2 is an explanatory diagram of a bank memory control method in multitasking. In the figure, 1 to n are tasks, 11 = I n is bank memory, l
O is a bank memory section, 20 is a dispatch processing section, 30
31 is a bank switching section, and 31 is a memory ROM.

Claims (1)

[Claims] A plurality of tasks (1 to n) obtained by dividing the processing program of a computer system are each stored in a predetermined bank memory (
11 to 1n) and in which a plurality of tasks are switched and processed in parallel by a dispatch processing section (20), a memory (31) that stores in advance a correspondence table between the tasks and the bank memory in the dispatch processing section; A bank memory control method in multitasking, characterized in that when a task is switched by an interrupt, a table in the memory is referred to and the bank memory corresponding to the task to be switched is switched to (30).