Shared resource access via declarations that contain a...

Details Shared resource access via declarations that contain a... Shared resource access via declarations that contain a...

2005-12-20

2005-12-20

Myers, Paul R. (Department: 2111)

Electrical computers and digital data processing systems: input/

Access arbitrating

C710S200000, C710S032000, C710S034000, C710S035000, C710S061000, C710S118000, C711S152000

Reexamination Certificate

active

06978330

ABSTRACT:
Logic (also called “re-ordering semaphore”) issues semaphore grants to access a shared resource in an order different from the order in which semaphore requests for accessing the shared resource are received. The re-ordering semaphore needs to receive a semaphore release between any two semaphore grants. There is no limit on the duration between a semaphore grant and a semaphore release, so that a task that receives a semaphore grant can use the shared resource for any length of time. In one embodiment, each request is associated with a number indicative of the order in which grants are to be issued, and the re-ordering semaphore uses this number in deciding which request is to be granted. The number can be a sequence number that is indicative of the order of arrival of packets that generated the requests.

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