System for releasing access status of an extended buffer memory

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3642281, 3642306, 3642389, 36424291, 3642431, 3642457, 3642665, 3649266, 36493146, 3649418, 3649427, 3649645, 3649692, 3649705, 364DIG1, 395725, 395250, G06F 1314, G06F 1316

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051631440

ABSTRACT:
In an information processing system comprising a main memory device, a plurality of processors, a system controller between the main memory device and the processors, and an extended buffer memory for carrying out a data transfer operation to and from the main memory device, the system controller comprises a communication lock circuit for selectively indicating a locked state and an unlocked state representative of a state of the extended buffer memory. The communication lock circuit is accessed to detect the state of the extended buffer memory each time when either a lock instruction or a lock release instruction is issued from each processor before a data transfer request is delivered from each processor to the extended buffer memory.

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J. C. Daly and J. T. Rodell Time-out/Voting Algorithm for Resource Contention in N-way Multiprocessing Systems IBM Technical Disclosure Bulletin, vol. 26, No. 2 Jul. 1983.

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