Exclusive access control to a processing resource

Details Exclusive access control to a processing resource Exclusive access control to a processing resource

2005-05-10

2005-05-10

Dang, Khanh (Department: 2112)

Electrical computers and digital data processing systems: input/

Access locking

C711S152000

Reexamination Certificate

active

06892257

ABSTRACT:
A data processing system is provided with multiple processors that share a main memory. Semaphore values associated with data elements within the memory system, including the main memory, are used to establish exclusive access permissions to those data elements. An exclusive access clear instruction is provided that serves to clear any partially completed exclusive access requests for a processor between the reading of a semaphore value and the writing of a semaphore value to establish the exclusive access permission.

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