JPH0772867B2 - Task control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A task control method for selecting and operating different basic systems, including a selecting means for selecting a basic system from a plurality of basic systems and a basic system necessary for the operation of each task. By providing a designation flag for designating, and selecting and designating the basic system by referring to the designation flag by the selection means, it is possible to operate different basic systems.

[Industrial application field]

The present invention relates to an apparatus in which a basic system is stored in a ROM, and more particularly to a task control system capable of selecting and operating a basic system required for the operation of each task from a plurality of basic systems.

There is a demand for a method capable of operating a different basic system or an old system in a device in which the basic system is stored in ROM without exchanging ROM and tasks.

[Conventional technology]

FIG. 4 shows a block diagram of a device 1 in which a basic system is stored in a ROM as a conventional example.

In the figure, 2a is a ROM in which the basic system A is stored. RAMs 4a and 4b store tasks A ₁ and A ₂ used in the basic system A. RAMs 5a and 5b store routines a ₁ and a ₂ used in the basic system A.

Therefore, the basic system A includes the testers A ₁ , A ₂ , and the routines a ₁ , a
_Operates according to ₂ to perform a function.

[Problems to be solved by the invention]

According to the above-mentioned conventional method, a task developed for a specific basic system cannot operate under a different basic system. Therefore, a task having the same function must be developed for each basic system. Even if a different basic system includes the basic system A, if there is a difference in the part unrelated to the task such as the initial program load (hereinafter referred to as IPL) method and the interrupt acceptance processing,
There is a problem that the tasks of both systems cannot coexist.

[Means for solving problems]

 FIG. 1 shows the principle of the present invention.

In the figure, 7 is a designated flag, 3 is a first storage unit that stores a designated flag 7 that designates a basic system required for task operation, 2 is a plurality of basic systems that are designated and designated by the designated flag 7. The second storage unit stores a selection unit 6 that selects a basic system and collectively switches to the basic system and tasks under the basic system.

Therefore, when using any of several basic systems,
The selection means 6 refers to the designation flag 7 of the first storage unit 3 to select the basic system from the second storage unit 2 based on the designation of the designation flag 7, and the basic system and the tasks under the basic system. It is configured to perform the processing by collectively switching to.

[Action]

When using any of the plurality of basic systems, the selection means 6 refers to the designation flag 7 of the first storage unit 3 and selects the basic system from the second storage unit 2 based on the designation of the designation flag 7. By collectively switching to the basic system and the tasks under the basic system and instructing the processing, different basic systems can be used without exchanging the ROM and creating a new task. It also eliminates the need to develop tasks with similar functions twice.

〔Example〕

An embodiment of the present invention will be described below with reference to the block diagram of FIG. The same reference numerals as those in FIGS. 1 and 4 denote the same objects. In FIG. 2, the ones corresponding to those in FIG. 1 are shown surrounded by a one-dot chain line.

In the figure, the device la includes a ROM 2b, a RAM 3a, 4a to 4d, and 5a to 5d.

ROM2b has basic systems A and B, and a basic system selector 6a.
Is stored.

The instruction 7a designated and input in advance is stored in the RAM 3a.

The RAMs 4a to 4d store tasks A ₁ and A ₂ under the basic system A and tasks B ₁ and B ₂ under the basic system B.

The RAMs 5a to 5d include routines a ₁ ,
The routines a ₁ and b ₂ used in a _{2 and the} basic system B are stored.

The basic system selection unit 6a collectively accepts processes such as start-up, interrupts, etc. that are unrelated to the tasks A ₁ , A ₂ , B ₁ , and B ₂ , and the instruction flag 7a
The selected basic system is selected with reference to, and the selected basic system and the tasks under the basic system are collectively switched.

The instruction flag 7a specifies the basic systems A and B required for the respective operations of the tasks A ₁ , A ₂ , B ₁ and B ₂ .

Since it has such a configuration and functions, when performing operations such as IPL and interrupt acceptance processing, the basic system selection unit 6a refers to the instruction flag 7a, and selects one of the designated basic systems A and B. Select and switch collectively to the selected basic system and the tasks under the basic system.

In this way, different basic systems can be used without ROM replacement and new task creation.

A different embodiment is shown in FIG. 3 is different from the embodiment described in FIG. 2 in the case where the basic system D includes the task service function of the basic system C, for example.
It is not necessary to have both tasks, and the basic system C
It is also possible to use the task of as a task of the basic system D.

In the figure, the device 1b is a ROM 2c, and RAM 3a, 4e ~ 4h, 5e ~ 5h
Is equipped with. The ROM 2c stores basic systems C and D and a basic system selection unit 6b. The RAMs 4e to 4h store the tasks C ₁ and C ₂ commonly used as subordinates of the basic system C and the basic system D, and the tasks D ₁ and D ₂ exclusively used as subordinates of the basic system D. ing.

The RAMs 5e to 5h have routines c ₁ ,
c ₂ and routines d ₁ and d ₂ used in the basic system D are stored.

The basic system selection unit 6b collectively accepts processes such as activation and interrupts unrelated to the tasks C ₁ , C ₂ , D ₁ , and D ₂ , and issues an instruction flag 7b.
The selected basic system is selected, and the selected basic system and the tasks under the basic system are collectively switched to instruct the processing.

The instruction flag 7b specifies the basic systems C and D necessary for the respective operations of the tasks c ₁ , c ₂ , D ₁ and D ₂ .

Since it has such a configuration and functions, when performing operations such as IPL and interrupt acceptance processing, the basic system selection unit 6b refers to the instruction flag 7b and selects one of the designated basic systems C and D. It is possible to select and switch to the selected basic system and tasks under the basic system at once.

In this way, when the basic system D includes the basic system C, the tasks c ₁ and c ₂ can be shared without exchanging the ROM and creating a new task. You don't have to develop your own tasks twice, and you can save memory.

〔The invention's effect〕

As described above, according to the present invention, a different basic system can be used without replacing the ROM and newly creating a task.

Eliminates the need to duplicate tasks with similar functions.

There is an effect.

[Brief description of drawings]

1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram showing an embodiment according to the present invention, FIG. 3 is a block diagram showing a different embodiment of the present invention, and FIG. 4 is a block diagram showing a conventional example. Is. In the figure, 2 is a second storage unit, 2a to 2c are ROMs, 3 is a first storage unit, 3a, 3b, 4a to 4d, 5a to 5d are RAMs, 6 is selection means, 6a and 6b are basic systems. Selector, 7 is a designation flag, 7a and 7b are instruction flags, A to D are basic systems, A _{1 to} D ₁ , A _{2 to} D ₂ are tasks, and a _{1 to} d ₁ and a _{2 to} d ₂ are routines. Show.

Claims (1)

[Claims] 1. In a device in which a plurality of basic systems and tasks are independently present under each of the basic systems, and the tasks perform processing by using the basic systems, a basic system required for the operation of the tasks is provided. A first storage unit that stores a designated flag that designates a system; and a basic system that stores the plurality of basic systems, selects the basic system designated by the designated flags, and tasks under the basic system And a second storage unit for storing a selection unit for instructing the processing by collectively switching to, and when any one of the plurality of basic systems is used, the selection unit specifies the designation flag of the first storage unit. , A basic system is selected from the second storage unit based on the designation of the designation flag, and the basic system and the tasks under the basic system are collectively switched and processed. Task control method, characterized in that to perform.