Boots – shoes – and leggings
Patent
1986-10-17
1989-02-28
Heckler, Thomas M.
Boots, shoes, and leggings
G06F 1300
Patent
active
048091685
ABSTRACT:
In a multi-processing computer system, a method for serializing references to shared data objects, such as pages, tables, and the like, that permits the system processes to reference objects on a shared access basis without obtaining a shared lock. A point of execution of the control program is monitored that is common to all processes in the system, which occurs regularly in the execution of each process and across which no references to any data object can be maintained by any process, except references using locks. A system reference point is established, which occurs after each process in the system has passed the monitored point of execution at least once since the last such system reference point. Operations requiring exclusive access, such as modification or destruction of the data object, are performed by, first, obtaining a conventional exclusive lock, then preventing any subsequent references to the data object, waiting until two of the system reference points have occurred, and, finally, performing the operation. Significant reductions in overhead can be achieved through the application of the invention.
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Hennessy James P.
Osisek Damian L.
Seigh, II Joseph W.
Heckler Thomas M.
International Business Machines - Corporation
Moore J. Dennis
Walker Mark S.
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