Patent
1994-03-17
1997-05-13
Kriess, Kevin A.
395680, G06F 1300
Patent
active
056301340
ABSTRACT:
A multiprocessor system employs an inter-processor exclusive control apparatus. The inter-processor exclusive control apparatus has local areas formed in local memories, respectively, or in a shared memory, to store exclusive control data, as well as a shared area formed in the shared memory, to store exclusive control data. Executable unit processes manipulated by the multiprocessor system are optionally divided into groups that are associated with the local areas, respectively. The local memories are accessible only by the executable unit processes in the corresponding groups. The shared memory is shared by these groups. Each of the local areas manages exclusive requests from the corresponding executable unit processes. The shared area manages exclusive requests from the groups. Since the exclusive requests from the executable unit processes are managed by both the local areas and shared area, the number of accesses to the shared area is decreased because the shared area is accessible only by the groups. As a result, the system achieves exclusive control at high speed.
REFERENCES:
patent: 5251318 (1993-10-01), Nitta et al.
patent: 5408652 (1995-04-01), Hayashi et al.
Banakhah Majid A.
Fujitsu Limited
Kriess Kevin A.
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