Method, system, and program for returning attention to a processing system requesting a lock

• US 20060036790A1
• Filed: 08/10/2004
• Published: 02/16/2006
• Est. Priority Date: 08/10/2004
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Peterson, Beth Ann, Coronado, Juan Alonso, Clark, Brian Dow
• Application Number:
  US10/916,171
• Publication Number:
  US 20060036790A1
• Time in Patent Office: Days
• US Class Current: 710/200
• CPC Class Codes: G06F 9/5011 the resources being hardware resources other than CPUs, Servers and Terminals
• CPC Class Codes: G06F 9/5016 the resource being the memory
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores
• CPC Class Codes: G06F 9/524 Deadlock detection or avoidance

Abstract

Provided are method, system, and program for returning attention to a processing system requesting a lock. A lock request for a resource is received from the processing system. Indication is made of a connection path on which the processing system initially communicated an establish request to establish a connection. Attention is returned on the indicated connection path to the processing system to signal the processing system that the processing system may own the requested lock in response to the lock for the resource becoming available. Subsequent messages are received from and transmitted to the processing system concerning the resource on at least one additional path.

Claims

1. A method, comprising:

receiving a lock request for a resource from a processing system;

indicating a connection path on which the processing system initially communicated an establish request to establish a connection;

returning attention on the indicated connection path to the processing system to signal the processing system that the processing system may own the requested lock in response to the lock for the resource becoming available; and

receiving and transmitting subsequent messages from the processing system concerning the resource on at least one additional path.

2. The method of claim 1, wherein the connection path and at least one additional path are included in a path group associated with an I/O device including the requested resource.

3. The method of claim 1, wherein the paths on which the processing system communicates comprise logical paths.

4. The method of claim 1, further comprising:

receiving a plurality of lock requests from different processing systems including processing systems for storage resources in I/O devices, wherein the operations of indicating the path, returning attention and receiving and transmitting the subsequent messages are performed for each received lock request.

5. The method of claim 4, further comprising:

writing information indicating the connection path for the processing system submitting the lock request to a table having information on the connection paths used by the processing systems submitting the lock requests to enable the returning of attentions for the lock requests to the processing systems on the connection paths the processing systems used to establish the connection.

6. A system in communication with at least one processing system over paths and at least one Input/Output (I/O) device, comprising:

a computer readable medium;

circuitry in communication with the computer readable medium and enabled to perform;

(a) receiving a lock request for a resource in one I/O device from the processing system;

(b) indicating in the computer readable medium a connection path on which the processing system initially communicated an establish request to establish a connection;

(c) returning attention on the indicated connection path to the processing system to signal the processing system that the processing system may own the requested lock in response to the lock for the resource becoming available; and

(d) receiving and transmitting subsequent messages from the processing system concerning the resource on at least one additional path.

7. The system of claim 6, wherein the connection path and at least one additional path are included in a path group associated with the I/O device including the requested resource.

8. The system of claim 6, wherein the paths on which the processing system communicates comprise logical paths.

9. The system of claim 6, wherein the circuitry is further enabled to perform:

receiving a plurality of lock requests from different processing systems including processing systems for storage resources in the I/O devices, wherein the operations of indicating the path, returning attention and receiving and transmitting the subsequent messages are performed for each received lock request.

10. The system of claim 9, wherein the circuitry is further enabled to perform:

writing information indicating the connection path for the processing system submitting the lock request to a table in the computer readable medium having information on the connection paths used by the processing systems submitting the lock requests to enable the returning of attentions for the lock requests to the processing systems on the connection paths the processing systems used to establish the connection.

11. The system of claim 6, wherein the processing systems comprise logical partitions within a single processing device.

12. An article of manufacture in communication with a processing system and I/O devices, wherein the article of manufacture is enabled to perform operations, the operations comprising:

receiving a lock request for a resource in one I/O device from the processing system;

indicating a connection path on which the processing system initially communicated an establish request to establish a connection;

returning attention on the indicated connection path to the processing system to signal the processing system that the processing system may own the requested lock in response to the lock for the resource becoming available; and

receiving and transmitting subsequent messages from the processing system concerning the resource on at least one additional path.

13. The article of manufacture of claim 12, wherein the connection path and at least one additional path are included in a path group associated with an I/O device including the requested resource.

14. The article of manufacture of claim 12, wherein the paths on which the processing system communicates comprise logical paths.

15. The article of manufacture of claim 12, wherein the operations further comprise:

receiving a plurality of lock requests from different processing systems including processing systems for storage resources in I/O devices, wherein the operations of indicating the path, returning attention and receiving and transmitting the subsequent messages are performed for each received lock request.

16. The article of manufacture of claim 14, wherein the operations further comprise:

writing information indicating the connection path for the processing system submitting the lock request to a table having information on the connection paths used by the processing systems submitting the lock requests to enable the returning of attentions for the lock requests to the processing systems on the connection paths the processing systems used to establish the connection.