Electrical computers and digital data processing systems: input/ – Access locking
Reexamination Certificate
2005-10-20
2008-09-02
Knoll, Clifford H (Department: 2111)
Electrical computers and digital data processing systems: input/
Access locking
C711S147000, C719S312000
Reexamination Certificate
active
07421529
ABSTRACT:
Semaphore operation manages exclusive access to a memory that is shared by a plurality of processing elements. Semaphore reservation status for exclusive access by a processing element is monitored by a memory controller. To clear an obsolete reservation status, a command signal is transmitted for a write operation to the memory while prohibiting update of the contents of a memory. The reservation status at the controller is changed from a reservation state to a non-reservation state in response to receipt of the command signal.
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“Distributed synchronization with shared semaphore sets” by Tapus et al. (abstract only) Publication Date: May 9-12, 2005.
Dieffenderfer James Norris
Ganasan Jaya Prakash Subramaniam
Sartorius Thomas Andrew
Speier Thomas Philip
Agusta Joseph B.
Knoll Clifford H
Pauley Nicholas J.
QUALCOMM Incorporated
Rouse Thomas
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