Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2006-02-03
2008-09-16
Thai, Tuan V. (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S147000, C711S154000, C711S162000
Reexamination Certificate
active
07426614
ABSTRACT:
A method and system of executing duplicate copies of a program in lock step. Some illustrative embodiments are a computer system comprising a first processor executing a program, a second processor executing a duplicate copy of the program (the first processor and second processor executing their respective programs in lock step), a logic device coupled to the processors, and a shared device coupled to the processors through the logic device. The first processor presents to the logic device a first operation involving the shared device, and the second processor does not present an operation, or presents an operation that does not match the first operation. The logic device obtains a second operation from the second processor that matches the first operation, and wherein a single operation that matches the first and second operations is presented to the shared device.
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patent: 5890003 (1999-03-01), Cutts, Jr. et al.
patent: 6233702 (2001-05-01), Horst et al.
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patent: 2004/0006722 (2004-01-01), Safford
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Bruckert William F.
Damian Mihai
Klecka James S.
Reynolds Peter A.
Southgate Dale E.
Hewlett--Packard Development Company, L.P.
Thai Tuan V.
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