Method of launching low-priority tasks

• US 8,245,231 B2
• Filed: 09/26/2007
• Issued: 08/14/2012
• Est. Priority Date: 07/02/2001
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Bower, Fred A. III
• Primary Examiner(s): To, Jennifer
• Assistant Examiner(s): Ghaffari, Abu Z
• Application Number:
  US11/861,957
• Publication Number:
  US 20080235694A1
• Time in Patent Office: 1,784 Days
• Field of Search: 718/102, 718/103
• US Class Current: 718/103
• CPC Class Codes: G06F 9/4843 by program, e.g. task dispatcher, supervisor, operating system

Abstract

A driver is provided to manage launching of tasks at different levels of priority and within the parameters of the firmware interface. The driver includes two anchors for managing the tasks, a dispatcher and an agent. The dispatcher operates at a medium priority level and manages communication from a remote administrator. The agent functions to receive communications from the dispatcher by way of a shared data structure and to launch lower priority level tasks in respond to the communication. The shared data structure stores communications received from the dispatcher. Upon placing the communication in the shared data structure, the dispatcher sends a signal to the agent indicating that a communication is in the data structure for reading by the agent. Following reading of the communication in the data structure, the agent launches the lower priority level task and sends a signal to the data structure indicating the status of the task. Accordingly, a higher level task maintains its level of operation and spawns lower level tasks through the dispatcher in conjunction with the agent.

Claims

1. A computer implemented method for managing tasks comprising:

a driver including a message manager and a task manager loaded in firmware, the message manager operating at a high priority level receiving a message from a remote administrator within the system firmware to launch a low priority task;

said message manager communicating said low priority task to said task manager by placing the message in a shared location and setting a flag signaling placement of said message, wherein said shared location is accessible by said message manager operating at said high priority level and the task manager operating at a low priority level; and

said task manager reading the message from the shared location in response to said flag, and launching said low priority task received from said message manager in response to the message from said message manager in said shared location, wherein launching said low priority task further performed without a suspension selected from the group consisting of;

a system interrupt, and a pause in a higher level task operation, wherein said message manager maintaining operation at said high priority level and said task manager maintaining operation at said low priority level.

2. The method of claim 1, wherein the step of communicating said low priority task to said task manager include communicating the flag for signaling placement of said message to said task manager.

3. The method of claim 2, further comprising said task manager reading said message in said shared location in response to receiving said flag and subsequently launching said low priority task.

4. The method of claim 3, further comprising said task manager resetting said flag following launch of said low priority task.

5. A computer system comprising:

a remote administrator located in firmware;

a set of resources within a driver loaded in said firmware and in communication with said remote administrator, said resources comprising;

a message manager operating at a high priority level to receive a message from said administrator to launch a low priority level task;

a task manager operating at a low priority level to launch said low priority level task;

a shared location accessible by said message manager operating at said high priority level and said task manager operating at said low priority level, said shared location to facilitate communication between said message manager and said task manager;

said message manager to communicate said low priority level task received from said message manager to said task manager through said shared location and to set a flag signaling placement of said message in the said location shared by the task manager and the message manager; and

said task manager to read the message from the shared location in response to said flag and launch said low priority level task received from said message manager in response to receipt of said message in said shared location, wherein launch of said low priority task is further performed without a suspension selected from the group consisting of;

a system interrupt, and a pause in a higher level task operation, wherein said task manager maintains said low priority level of operation and said message manager maintains said high priority level of operation.

6. The system of claim 5, further comprising the flag communicated to said task manager from said message manager to signal receipt of said communication in said shared location.

7. The system of claim 6, wherein said task manager reads said message in said shared location and launches said low priority task in response to receipt of said communication.

8. The system of claim 6, further comprising said task manager to reset said flag in said shared location in response to launch of said low priority task.

9. An article comprising:

computer storage including a remote administrator located in firmware and a set of resources in said firmware in communication with said remote administrator, and computer program instructions configured to manage tasks in said firmware, said instructions comprising;

instructions to maintain a driver including a message manager and a task manager loaded in firmware;

instructions to maintain the message manager at a high priority level to receive a message from said remote administrator within system firmware to launch a low priority task;

instructions for said message manager to place said message in a shared location and to set a flag signaling placement of said message, wherein said shared location is accessible by said message manager and the task manager operating at a low priority level;

instructions to communicate said low priority level task to said task manager in response to placement of said message in said shared location; and

instructions for said task manager to read the message from the shared location in response to said flag and to launch said low priority task received from said message manager in response to the message from said message manager in said shared location, wherein launching said low priority task is further performed without a suspension selected from the group consisting of;

a system interrupt, and a pause in a higher level task operation, wherein said message manager maintaining operation at said high priority level and said task manager maintaining operation at said low priority level.

10. The article of claim 9, wherein the instructions to communicate said low priority task to said task manager includes instructions to communicate the flag to signal presence of said message and said task manager to read said message in said shared location and to launch said low priority task in response to said flag.

11. The article of claim 10, further comprising instructions to reset said flag following launch of said low priority task.