Data sharing method in a plurality of computer systems

Details Data sharing method in a plurality of computer systems Data sharing method in a plurality of computer systems

1997-05-20

1999-11-02

Dinh, Dung C.

Electrical computers and digital processing systems: multicomput

Multicomputer data transferring via shared memory

Partitioned shared memory

711153, 711202, G06F 1300, G06F 15167

Patent

active

059788399

ABSTRACT:
Processor apparatuses share data, used in common for a plurality of systems, in a global memory in a share system. The global memory is divided into constant units and the individual division units are managed by using identifiers which are definitely determined as viewed from the processor apparatuses and the share system. When an inter-system exclusive state conditioning unit of a processor apparatus designates a desired area on an address space in the processor apparatus by using an identifier to obtain a locked resource, an update state confirming unit checks whether data in a corresponding unit in the share system is updated, and when the data is updated, a data transferring unit transfers the data in the corresponding unit in the share system to the address space. Accordingly, a program operating on each computer system can easily access the data shared by the systems without being aware of the presence of the share system. When the locked resource is released, a data transferring unit transfers the data to the corresponding unit in the share system if the data in the address space is updated.

REFERENCES:
patent: 5485594 (1996-01-01), Foster
patent: 5522045 (1996-05-01), Sandberg
patent: 5829041 (1998-10-01), Okamoto et al.
Program Product VOS3/AS Center Operation--JSS3-, pp. 226-239, Hitachi Computers General Information/User Guide, Dec. 1995.

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