JPH01196656A - Task switching system - Google Patents

Abstract

PURPOSE:To effectively use an operation system processor by determining a processor, which executes a task, according to the processor block of a displaying means to be provided in the task. CONSTITUTION:A displaying means A is provided in the task in order to display the respective processor blocks according to information which show whether a task 3 can be executed only by an operation system processor 1 or can be executed by an application program processor 2 as well. Then, a processor switching means B is provided to determine the processor, which executes the task 3, according to the processor block and a processor updating means is equipped to update the displaying means A on the basis of these information in the task 3. Thus, the operation system processor 1 can be effectively used and the system of multiprocessor constitution can be full used.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a task switching method, particularly 1. The present invention mainly relates to a task switching method in a multiprocessor system having an O87 processor that executes an operation system and an AP processor that executes an application program.

[Conventional technology]

Conventionally, task switching for this building has been carried out by interrupting the operating system (hereinafter referred to as O8) by stopping the task that was No. 1 A and starting the task determined by the priority at that time.

As is well known, some tasks can only be executed by an OS processor, while others can be executed by both an OS processor and an application (hereinafter referred to as AP) processor. So, I was never aware of these types of tasks.

[Problem to be solved by the invention]

The conventional task switching method described above does not take into account the type of task when switching between tasks, and even if the AP processor can perform the processing, the OS processor may end up processing it. There is a problem that the OS processor is not being used effectively.

Note that "1 case in which a task can be processed by the AP processor" refers to a case in which processing can be performed without synchronization between tasks.

[Means to solve the problem]

The method of the present invention mainly uses the operation system'c
Execution - In a task switching method in a multiprocessor system having an operating system processor that executes an application program and an application processor that executes an application program, it is determined whether the task can be executed only by the operating system processor or can also be executed by the application program processor. display means provided in the task for displaying each processor classification by information indicating the processor classification; processor switching means for determining the processor to execute the task according to the processor classification; and processor updating means for updating the display means.

〔Example〕

Next, non-invention will be explained with reference to the drawings.

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

Referring to FIG. 1, this embodiment shows an OS processor 1, an AP
Processor 2. It consists of an indicator A that indicates the existing executable processor in task 3, and an OS call instruction that changes all executable processors of the current task. 4
In FIG. 1, the indicator A specifies the OS processor.

In task 3, whether task 3 can be executed only on OS processor 1 or whether OS processor 1 and A
All information indicating whether the program can be executed by any of the P processors 2 is included.

If task 3 is being executed on OS processor 1 according to the specification of indicator A, and the process becomes such that it can also be executed on AP processor 2, task 3 executes the OS call instruction within its own process. (Figure 2). When this instruction is executed, the indicator A indicating the executable processor in task 3 changes to AP processor 2 (FIG. 3).

Thereafter, task 3 is scheduled to the AP processor 2 and executed by the AP processor 2 (FIG. 4).

When task 3 becomes something that can only be executed by OS processor 1, OS call instruction C is executed again.
The indicator A indicating an executable processor is OS processor 1.
#) The OS processor IK is scheduled (FIG. 5).

〔Effect of the invention〕

As described above, the present invention has a configuration in which an executable processor is specified for the invoking task, so that the OS processor can be used effectively and a system with a multiprocessor configuration can be fully utilized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 to 5 are explanatory diagrams of this embodiment. 1...US processor, 2...AP processor, 3...task. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Scope of Claims] In a task switching method in a multiprocessor system mainly having an operation system processor that executes an operation system and an application processor that executes an application program, the task can only be executed by the operation system processor. Display means provided in a task for displaying each processor classification with information indicating whether the application program can be executed by the processor; and processor switching means for determining a processor to execute the task according to the processor classification. and processor update means for updating the display means based on the information in the task.