Shared access serialization featuring second process lock steal

Details Shared access serialization featuring second process lock steal Shared access serialization featuring second process lock steal

1993-09-16

1994-04-19

Lee, Thomas C.

Boots, shoes, and leggings

395725, 3642453, 3642689, 3642692, 364DIG1, G06F 1300, G06F 1314

Patent

active

053054482

ABSTRACT:
A Shared Data Access Serialization mechanism for sharing data among a plurality of systems while maintaining data integrity. User data is maintained on a primary and optionally an alternate data store. Each data store contains a set of lock blocks, one for each system sharing the data. The contents of the lock blocks, normally a time-of-day value, indicate system ownership status of the associated data. "Lock Rules" are disclosed for determining resource ownership, as well as a "lock stealing" mechanism for obtaining resource ownership from a temporarily stopped system. Suffix records and check records are used to insure data integrity. Error indications deduced from inconsistent suffix and/or check records are used to trigger a data recovery mechanism, and the recovery mechanism can synchronize a primary and secondary data store without the necessity of suspending access to the primary during the synchronization process.

REFERENCES:
patent: 4823261 (1989-04-01), Bank et al.
patent: 4979105 (1990-12-01), Daly et al.

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