Method of and apparatus for managing task, and computer product

• US 20050183085A1
• Filed: 05/24/2004
• Published: 08/18/2005
• Est. Priority Date: 02/17/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sun, Zhitai
• Granted Patent: US 7,707,576 B2
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 9/4843 by program, e.g. task dispatcher, supervisor, operating system

Abstract

A task management method includes determining, when a task other than an operating system task operated cooperatively with a process executed under a control of an operating system requests a cooperative operation to the operating system task and is set in a wait state, whether a priority of the task is higher than a priority of other task set in a wait state by requesting a cooperative operation to the operating system task, and making, when the priority of the task is determined to be higher than the priority of the other task, the operating system task and a process under control of the operating system operated cooperatively with the task succeed the priority of the task.

Claims

1. A computer program making a computer execute:

determining, when a task other than an operating system task operated cooperatively with a process executed under a control of an operating system requests a cooperative operation to the operating system task and is set in a wait state, whether a priority of the task is higher than a priority of other task set in a wait state by requesting a cooperative operation to the operating system task; and

making, when the priority of the task is determined to be higher than the priority of the other task, the operating system task and a process under control of the operating system operated cooperatively with the task succeed the priority of the task.

2. The computer program according to claim 1, further making the computer execute

determining, when resuming the cooperative operation requested to the task after completion of the operating system task, whether the other task is present;

and

making, when the other task is determined to be present, a process operated cooperatively with a task with the highest-priority from among the operating system task and the other task succeed priority of the task with the highest-priority.

3. The computer program according to claim 1, wherein the determining includes determining whether the priority of the task is higher than the priority of the other task by using a priority succession management list in which control blocks of tasks set in a wait state by requesting a cooperative operation to the operating system task are connected in order of priority.

4. The computer program according to claim 2, wherein

the determining includes determining whether the other task is present by using a priority succession management list in which control blocks of tasks set in a wait state by requesting a cooperative operation to the operating system task are connected in order of priority, and

the making includes making a process operated cooperatively with a task with the highest-priority from among the operating system task and the other task succeed priority of the task with the highest-priority by using the priority succession management list.

5. The computer program according to claim 1, wherein the making includes

specifying an inter-OS cooperative operation mechanism that performs a cooperative operation stored in a task control block of a task set in a wait state by requesting the cooperating operation from the operating system by using a task control block wait queue;

and

making a process operated cooperatively with the task succeed the priority through the inter-OS cooperative operation mechanism specified.

6. The computer program according to claim 5, wherein

the task control block includes a pointer to the inter-OS cooperative operation mechanism used by the task as a wait target, and

the specifying includes specifying the inter-OS cooperative operation mechanism used by the task by using the wait target included in the task control block.

7. The computer program according to claim 1, wherein a cooperative operation between the process and the task is a communication using an inter-OS communication mechanism.

8. A task management apparatus comprising:

a priority determining unit that determines, when a task other than an operating system task operated cooperatively with a process executed under a control of an operating system requests a cooperative operation to the operating system task and is set in a wait state, whether a priority of the task is higher than a priority of other task set in a wait state by requesting a cooperative operation to the operating system task; and

a priority succession unit that makes, when the priority of the task is determined to be higher than the priority of the other task, the operating system task and a process under control of the operating system operated cooperatively with the task succeed the priority of the task.

9. A task management method comprising:

determining, when a task other than an operating system task operated cooperatively with a process executed under a control of an operating system requests a cooperative operation to the operating system task and is set in a wait state, whether a priority of the task is higher than a priority of other task set in a wait state by requesting a cooperative operation to the operating system task; and

making, when the priority of the task is determined to be higher than the priority of the other task, the operating system task and a process under control of the operating system operated cooperatively with the task succeed the priority of the task.

10. A computer readable recording medium for storing a computer program that makes a computer execute:

determining, when a task other than an operating system task operated cooperatively with a process executed under a control of an operating system requests a cooperative operation to the operating system task and is set in a wait state, whether a priority of the task is higher than a priority of other task set in a wait state by requesting a cooperative operation to the operating system task; and

making, when the priority of the task is determined to be higher than the priority of the other task, the operating system task and a process under control of the operating system operated cooperatively with the task succeed the priority of the task.