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Abstract

A method of recovering an exclusive control instruction in a computer system having a plurality of processor modules and a plurality of shared memory modules which are coupled via a system bus. At least a part of the shared memory modules forms a dual construction. The exclusive control instruction makes access from an arbitrary one of the processor modules to the shared memory modules. First, a read access is performed to a master shared memory module from the arbitrary processor module in response to the exclusive control instruction. Thereafter, a write access is performed to a slave shared memory module, which forms a pair with the master shared memory module from the arbitrary processor module, so as to rewrite data in the slave shared memory module. Finally, a write access is performed to the master shared memory module from the arbitrary processor module, so as to rewrite data in the master shared memory module.

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First Claim