Method of and apparatus for task control, and computer product

• US 20050050541A1
• Filed: 02/25/2004
• Published: 03/03/2005
• Est. Priority Date: 08/26/2003
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Uchiyama, Toru, Kato, Takeharu, Hasegawa, Kenichi, Sun, Zhitai
• Granted Patent: US 8,555,285 B2
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 9/4881 Scheduling strategies for dispatcher, e.g. round robin, multi-level priority queues

Abstract

A task control computer program includes computer executable instructions which when executed by a computer, cause the computer to execute an operating system as a task. The computer is caused to perform determining whether there is an executable non-idle process under control of the operating system and changing a set priority of the operating system task to a priority higher than the primary priority of the operating system task when it is determined that there is an executable non-idle process with the specified time elapsed.

Claims

1. A task control computer program including computer executable instructions which when executed by a computer, cause the computer to execute an operating system as a task by performing:

determining whether a non-idle process is included in executable processes to be executed under control of the operating system; and

changing a set priority of the operating system to a higher priority higher than a primary priority of an operating system task when it is determined at the determining that the executable processes include the non-idle process.

2. The task control computer program according to claim 1, further comprising a system call that executes the determining and the changing.

3. The task control computer program according to claim 1, further comprising changing the higher priority to the primary priority after the operating system has been executed at the higher priority for a predetermined period of time.

4. The task control computer program according to claim 1, wherein the determining comprises:

determining whether a non-idle process is executable under the control of the operating system;

determining whether a schedule request has been made to the operating system; and

determining whether an interruption request has been made to the operating system.

5. The task control computer program according to claim 4, wherein the determining whether the non-idle process is executable under the control of the operating system is based on a process identifier stored in a process control block (PCB) of the process.

6. The task control computer program according to claim 4, wherein the determining whether the schedule request has been made to the operating system is based on a schedule request flag stored in a process control block of the current process.

7. The task control computer program according to claim 4, wherein the determining whether an interruption request has been made to the operating system is based on an interruption request flag provided in a global area of the operating system.

8. The task control computer program according to claim 1, wherein the primary priority is changed to the higher priority when a predetermined period of time has elapsed after it is determined that there is an executable non-idle process.

11. The task control computer program according to claim 2, further comprising changing the higher priority to the primary priority after the operating system has been executed at the higher priority for a predetermined period of time.

9. A task control apparatus for causing a computer to execute an operating system as a task, comprising:

a determining unit that determines whether a non-idle process is executable under control of the operating system; and

a changing unit that changes a set priority of an operating system task to a priority higher than the primary priority of the operating system task when the determining unit determines that there is an executable non-idle process.

10. A task control method for causing a computer to execute an operating system as a task, comprising:

determining whether executable processes to be executed under control of the operating system include a non-idle process; and

changing a set priority of an operating system task to a priority higher than the primary priority of the operating system task when it is determined that there is an executable non-idle process.