The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1999
Filed:
May. 20, 1997
Susumu Okuhara, Yokohama, JP;
Hiroshi Morishima, Yokohama, JP;
Shingo Maeda, Yokohama, JP;
Kikuko Morishima, Yokohama, JP;
Hitachi, ltd., Tokyo, JP;
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.