JP2590872B2 - Task scheduling method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a task scheduling method in an operating environment in which a plurality of OSs operate in parallel in one central processing unit.

2. Description of the Related Art A task or a process is a control unit of an operating system (hereinafter referred to as an OS). In a conventional task scheduler, one task is controlled under one OS. Hereinafter, a conventional task scheduler will be described with reference to FIG. 4 and FIG.

In FIG. 4, reference numeral 14 denotes an OS running on a conventional system,
Reference numeral 15 denotes a scheduler for managing the OS 14, and reference numerals 16 to 18 denote tasks controlled by the scheduler 15.

In the above configuration, tasks 16 to 18 are the only OS
It is managed and operated by 14 and scheduler 15.

FIG. 5 shows a conventional example in which a plurality of OSs operate in parallel. In FIG. 5, reference numeral 19 denotes one OS that operates in parallel, 20 denotes a scheduler under this OS 19, 21 denotes the other OS that operates in parallel, 22 denotes a scheduler under this OS 21, 23 to 25 Is a task controlled under OS21, 26-28 is an OS
It is a task controlled under 19.

In the configuration shown in FIG. 5, the OS 21, the scheduler 22, and the tasks 23 to 25 are one task # 1 of the OS 19
Running as 26. Tasks # 2 27 and #n 28 have the same configuration as task # 126.

Problems to be Solved by the Invention In the conventional example shown in FIG. 4, in one central processing unit, another OS cannot operate in parallel.

In the conventional example shown in FIG. 5, a plurality of OSs can be operated in parallel, but the OS 21 and its tasks 23 to 25 operate as one task of the OS 19, and the two schedulers 20, 22 operate independently independently of each other. doing. Here, when tasks 23 to 25 enter a wait state under OS 19, the OS and these tasks 23
25 are all in a waiting state under the OS 19, which hinders the efficient operation of the tasks 23 to 25 of the OS 21.

The present invention solves the above-mentioned problems of the prior art, and enables the operation of a plurality of OSs in one central processing unit and improves the efficiency of the operation of tasks under the plurality of OSs. It is the purpose.

Means for Solving the Problems In order to achieve the above object, the present invention includes a plurality of OSs and a scheduler included in each OS, and a task is independently controlled by each scheduler. .

Operation In the above configuration, after a plurality of tasks operate under the control of one OS, each task internally sets itself to the other.
By generating a task as a task for the OS, the task can be operated under the control of a plurality of OSs.

Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing the basic configuration of the present invention. -5 are different schedulers 2, 6
Is independently controlled and operated. Here tasks 3-5
Is a task under the control of the scheduler 2 and is also a task under the control of the scheduler 6, and can use the system functions of both OS1 and OS7.

Next, the operation of the present invention will be described with reference to FIGS. Tasks 3 to 5 are generated as tasks under the control of OS1, and each task 3 to 5 is activated. Each of the activated tasks 3 to 5 is controlled and operated by the scheduler 2 of the OS1, but each task is provided with a command for notifying the OS7 of its own memory area, start address, etc., and generating itself as a task of the OS7. By placing, each task 3-5
Is generated and activated as a task under the control of the OS 7 during its operation, and operates under the control of the scheduler 6 of the OS 7. As a result, tasks 3 to 5 are performed by both OS1 and OS7.
Works.

FIG. 3 shows a specific embodiment of the present invention. In FIG. 3, 8 is an OS for general-purpose business processing, 9 is a scheduler of this OS 8, 10 is a data input / output processing task, 11 is a business processing task, and 12 is a scheduler of an OS 13 for real-time processing.

The operation of the above configuration will be described below. Tasks 10 and 11 are OS for general-purpose business processing at initial startup
It is registered as a task 8 and operates under the scheduler 9.

Next, inside each task 10, 11, for real-time processing
Registration processing as a task of OS13 is performed, and the scheduler
Under 12, it operates as a task of OS13 for real-time processing.

Task 10 is a data input / output processing task that requires high-speed access.
Under the control of OS8, office work task 11 mainly operates under the control of OS8 for general-purpose office work.
It operates using the characteristic scheduler function.

In addition, each OS switches mutual operations, for example, at regular time intervals or the other interrupt processing, and each scheduler operates asynchronously without contacting each other,
Data passing between tasks depends on the application,
For example, it is performed via a memory.

Effects of the Invention As described above, the present invention enables a wide range of applications from real-time control to office use by enabling a plurality of different OSs to operate in parallel and allowing one task to operate under the scheduler management of a plurality of OSs. It has the advantage of being applicable to the field, and its effect is great.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a task scheduler according to the present invention, FIG. 2 is a flowchart showing a processing flow of the block diagram of FIG. 1, and FIG. 3 is a block diagram in an embodiment of the task scheduler according to the present invention. Figures, 4 and 5
The figures are block diagrams of a conventional task scheduler. 1,7 ... OS, 2,6,9,12 ... scheduler, 3 ~
5: Task, 8: OS for general-purpose business processing, 10: Data input / output processing task, 11: Business processing task, 13: OS for real-time processing.

Claims (1)

(57) [Claims] After a plurality of tasks are started under the control of one operating system, each task is generated inside another task for another operating system, so that each task can be executed independently. A task scheduling method characterized by operating under the asynchronous control of schedulers of a plurality of operating systems.