Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Patent
1997-12-26
2000-08-15
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
709229, 710200, 711150, 711163, G06F 300
Patent
active
061050857
ABSTRACT:
A shared resource lock mechanism is provided which enables processors in a multi-processor environment which each share common resources to obtain locks on those resources. The lock mechanism also includes a reserve feature which provides a mechanism for a processor to maintain a lock on a resource for several input/output cycles. The lock mechanism combines the lock feature and the reserve feature in a single structure. This combination allows a processor to manipulate both the lock data and reserve data in a single transaction. Thus, in transactions requiring manipulation of both the lock and reserve elements, overhead is significantly reduced. In addition a unification of software routines which manipulate the lock and reserve data is achieved.
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patent: 5892955 (1999-04-01), Ofer
EMC Corporation
Fitzgerald Leanne J.
Gunther John M.
Lee Thomas C.
Wang Albert
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