G - Physics – 06 – F
Patent
G - Physics
06
F
354/245
G06F 12/08 (2006.01)
Patent
CA 1236589
ABSTRACT OF THE DISCLOSURE A masking circuit for a multiprocessor system is disclosed. In the multiprocessor system, a first command status register contains information associated with a first processor of the multiprocessor system and a second command status register contains information associated with a second processor of the multiprocessor system. Normally, the command status registers contain command information related to the processing of commands for their respective processors. However, during a flush operation, wherein data stored in the cache of a second processor is flushed to a main memory in order to allow access to the data by a first processor, the command being executed by the first processor must be blocked in order to allow the flush operation to be completed. When the flush operation is complete, the execution of the command by the first processor commences. The first command status register contains the command being executed by the first processor, and the second command status register contains information related to the need for a flush operation. The masking circuit of the present invention senses the existence of the command in the first command status register and the information, related to the flush operation, in the second command status register and masks the command in the first command status register from the multiprocessor system until the flush operation (as indicated by the contents of the second command status register) is complete. When the command is masked, the execution of the command is postponed until the flush operation is completed. When the flush operation is complete, the second command status register is reset. When reset, the multiprocessor system is permitted to commence execution of the command.
482000
Dutton Patrick F.
Jackson Earl W. Jr.
International Business Machines Corporation
Kerr Alexander
LandOfFree
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