Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Reexamination Certificate
2005-09-27
2005-09-27
Barron, Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
C718S104000
Reexamination Certificate
active
06950945
ABSTRACT:
An apparatus and method for distributed intersystem lock optimization are provided. With the apparatus and method of the present invention, the time required to obtain an uncontested lock, meaning a lock that no other program or process in the distributed system is simultaneously attempting to acquire, is minimized. The apparatus and method of the present invention increases the speed with which locks are acquired by splitting the process of obtaining a lock into two separate operations: a test for contention, and then if contention exists, a full lock operation. The test for contention is made fast by associating each lock with a memory location, and using an atomic operation or the like, to atomically set the memory location associated with the lock to a different value. If the lock is found to be contested, meaning that another program or process has already locked it, control is turned over to a slower operation than ensures that the lock-requesting program or process will eventually be granted the lock.
REFERENCES:
patent: 5392433 (1995-02-01), Hammersley et al.
IBM Technical Disclosure Bulletin, “Fine Granularity Locking to Support High Data Availability in a Client/Server Database Management System”, Feb. 1995, pp. 143-146.
Pfister Gregory Francis
Recio Renato John
Wadia Noshir Cavas
Barron Gilberto
Formby Betty
Gurshman G.
International Business Machines - Corporation
McBurney Mark E.
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