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Patent Title: Detection of deletion of stored data by concurrently executing processes in a multiprocessing data processing system

Assignee: IBM
Patent Number: US5247647
Issue Date: 09-21-1993
Application Number:
File Date:04-29-1992

Abstract: A virtual lookaside facility maintains named data objects in class-related data spaces by virtual storage, for use by user programs. Concurrently executing service processes use local copies of an access token to access the data in the data spaces. Deletion of one of the data spaces invalidates the access token so that active processes will encounter a program check on access after data deletion. An error recovery means, recognizing the invalid token as cause of the program check, provides an appropriate return code to the invoker of the service process.


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IBM Pledge dated 1/11/2005