Electrical computers and digital data processing systems: input/ – Access locking
Reexamination Certificate
2005-04-26
2005-04-26
Myers, Paul R. (Department: 2111)
Electrical computers and digital data processing systems: input/
Access locking
C710S108000, C710S110000, C709S210000, C709S211000, C709S215000, C709S248000, C707S793000
Reexamination Certificate
active
06886064
ABSTRACT:
In a computer system having a logical-partitioned server, each partition of the server is provided with its own separate lock and access corridor, in addition to a global lock. When the locking of a partition lock is followed by the locking of the global lock, the system is serialized. The partition locks are controlled by system firmware on behalf of an OS isolating each partition; however, the global lock is controlled by the system firmware to be unlocked independent of the lock/unlock status of the partition locks. In this manner, the ability or inability of an OS that issued a machine check interrupt to unlock its partition lock after the machine check analysis is complete is irrelevant; once the machine check analysis is complete, the system firmware unlocks the global lock, giving other partitions access to shared system resources to run their own machine checks.
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Dawkins George John
Desai Prakash Vinodrai
Lee Van Hoa
McIntosh Gordon D.
International Business Machines - Corporation
McBurney Mark
Myers Paul R.
Phan Raymond N
Synnestvedt & Lechner LLP
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