Electrical computers and digital data processing systems: input/ – Access locking
Reexamination Certificate
2007-12-04
2007-12-04
Perveen, Rehana (Department: 2116)
Electrical computers and digital data processing systems: input/
Access locking
Reexamination Certificate
active
10692038
ABSTRACT:
In one embodiment of the invention, a method of semaphoring between a system firmware and ACPI subsystem, includes: prior to entering a critical section by a first entity, checking a turn flag to determine if a second entity has a turn to access a critical section; if the second entity has the turn, then checking an In flag of the second entity to determine if the second entity is in the critical section; if the second entity is in the critical section, then waiting for the second entity to exit the critical section; and entering the critical section by the first entity. The method may further include: if the second entity is not in the critical section, then entering the critical section by the first entity.
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Lee Terry
Qureshi Shiraz Ali
Wei Dong
Hewlett--Packard Development Company, L.P.
Perveen Rehana
Rehman Mohammed H
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