Browse Prior Art Database

Job List Verification

IP.com Disclosure Number: IPCOM000081109D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 99K

Publishing Venue

IBM

Related People

Breon, JR: AUTHOR

Abstract

Errors occurring during the job list manager's manipulation of the resident job list may cause system failure at a much later time. Dumps taken at failure time may be of little or no value in isolating the cause of failure. A method of validating the resident job list is needed to note errors as they occur.

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Job List Verification

Errors occurring during the job list manager's manipulation of the resident job list may cause system failure at a much later time. Dumps taken at failure time may be of little or no value in isolating the cause of failure. A method of validating the resident job list is needed to note errors as they occur.

The Job List Verification Program (JLVP) is a diagnostic tool that acts as a monitor. It examines the resident job list for errors and inconsistencies that may eventually lead to system failure. It can be made active at any time by setting a verification bit.

With JLVP active, each execution of a job list manager module calls for job list verification. When JLVP detects error, it calls for a formatted system dump. After dumping is complete, JLVP calls for an error message with a return code indicating the nature of the error. Using the dump and message can lead to faster diagnosis of the problem. (After the message is issued, the verification bit is turned off because continued verification would provide no further useful information until the current problem is solved.)

Fig. 1 shows JLVP logic and the types of errors detected by it. Fig. 2 shows the resident job list. It can be used in relation with Fig. 1 processing.

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