G - Physics – 06 – F
Patent
G - Physics
06
F
354/233
G06F 15/16 (2006.01) G06F 9/46 (2006.01) G06F 15/167 (2006.01)
Patent
CA 1256582
ABSTRACT OF THE DISCLOSURE The present invention pertains to the field of high speed digital data processors, and more particularly to multiprocessor systems. The specification discloses an inter- processor communication system for a multiprocessor data processing system which includes a common control circuit including a plurality of semaphore registers which may be accessed by any one of the processors, and a plurality of information registers which may be addressed directly by any one of the processors. The semaphore registers and the information registers are organized into a plurality of clusters, with each of the processors having associated therewith a cluster code indicative of which, if any, of the clusters the processor may access. A local control circuit is asso- ciated with each processor and is in relatively close proximity thereto as compared to the common control circuit. The local control circuit monitors instructions to reference or alter registers in the common control circuit and controls the issue of such CPU instructions according to the availability of the common control circuit. The local control circuit includes a plurality of local semaphore registers maintained with a copy of the data in the common semaphore register cluster associated with the respective processor. The local control circuit further includes means for testing the status of a bit in the local semaphore register in response to a processor instruction requesting that the corresponding bit in the common control circuit be test and set, and for providing for the immediate issue of the instruction in the case where the bit is clear and the instruction may issue, whereby delays associated with communicating with the common control to determine the appropriateness of issuing the instruction are avoided. Various aspects of the apparatus are disclosed together with a method of communication.
512349
Cray Research Inc.
Gowling Lafleur Henderson Llp
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