Hitachi, Ltd.

Kimitoshi Yamada

Takehisa Hayashi

Satoshi Yoshizawa

Hideki Murayama

Hiroshi Yashiro

Hiroshi Iwamoto

Toru Horimoto

Katsuya Takanashi

Kazuo Horikawa

Hideaki Gemma

Kazuo Masai

Atsushi Kobayashi

Masahiko Yamauchi

Yusuke Hino

Ikuo Kimura

Akira Kito

Tsutomu Goto

Tomihiko Kojima

Toshiharu Iwata

Tohru Horimoto

A computer system having a plurality of computers connected to each other by a computer coupling mechanism. Each computer includes a processor, memory, I/O device, disk control mechanism, computer coupling network adapter, disk requirement processing section connected to a system bus, and a disk connected to a disk control mechanism. The disk requirement processing section controls the disk, in response to a processing requirement for the disk from one of the processors of the other computers, based on structural definition information. The structural definition information describes a structure of the computer system. The computer system may be a loosely-coupled computer system.

Computer system having a plurality of computers each providing a shared storage access processing mechanism for controlling local/remote access to shared storage devices

Computer system having a plurality of computers each providing a shared

A distributed shared memory management system for a distributed shared memory computer system having a plurality of computers interconnected by a network, each computer having an independent address space and logically sharing data physically distributed to a storage of each computer. Each computer running a program for reading/changing the shared data includes a coherence control designation command for designating to enter a mutual exclusion state in which two or more computers cannot change the logically single shared data, a coherence control release command for designating a release of the mutual exclusion state, and a coherence control execution command for reflecting the contents of the shared data changed between the coherence control designation command and the coherence control release command, upon the logically single shared data in another computer. At least one of the plurality of computers includes a request message queue for storing a coherence control request message issued by the coherence control execution command when the coherence control designation command is executed. The coherence control designation command includes data for designating the order of reading/changing the shared data, and the request message queue includes a counter for storing a current state regarding the control of the order of reading/changing the shared data and a unit for storing a value regarding the control of the order of reading/changing the shared data.

Distributed shared data management system for controlling structured

In communication which uses a communication line which allows the determination of a communication protocol in a communication port prior to the communication like in an ISDN network, a communication program corresponding to the determined communication protocol is dynamically linked and initialized to allow dynamic selection of the communication protocol.

Protocol selector and protocol selection method

A distributed interactive processing in a complex computer system including a plurality of work stations (IWS's), each having predetermined server processes, at least a host computer (HOST), communication lines interconnecting between the plurality of IWS's and the HOSTs, and communication control portions to establish and to control communication paths between processes to conduct a process-to-process communication between the IWS's and the HOSTs. Each IWS has therein a process to implement an assigned processing request and a request control section to analyze the processing request issued by the own IWS and to determine a server process required to implement the processing request. Among a result of the request analysis, a predetermined server process is executed in the own IWS. The communication control portions establish a communication path between an associated server process in the relevant HOST and the request process in the IWS in accordance with the determination in the IWS regarding server process and thereby enable the IWS to perform an on-line interactive processing in combination of the server process in the HOST and the process in the IWS.

Distributed interactive processing method in complex system including

In a transfer data screen buffer added to a multi-window display, a command stream for displaying segments to be displayed and superposed over the multi-window display is stored. By the execution of the command stream, the display data developed into a bit map undergoes exclusive OR operation bit by bit with the bit-map developed data of the multi-window data. The operation result is fed back to the display screen bit map memory to be displayed.

Multi-screen display control system and its method

A composite loop communication network formed by combining a plurality of loop communication paths each provided with terminals with one another through a plurality of loop coupling devices so as to form a loop, is disclosed in which one of the terminals of each loop communication path is used as a management terminal, the management terminal of a loop communication path sets routing information on the communication between the loop communication path and a loop communication path adjacent thereto in a loop coupling device, and the loop coupling device selectively takes in data flowing through the former loop communication path, on the basis of the above routing information, to send the data from the loop coupling device to the latter loop communication path, thereby making possible the communication between terminals of different loop communication paths.

Method and system for loop communication

A display screen control method for a display device capable of supporting a logical screen larger in size than its physical screen is provided. This method enables a desired area to be displayed on the display device by a single operation. According to the method, a first rectangle similar to the logical screen is displayed on the physical screen, a second rectangle similar to the window area which was displayed within a view port in the physical screen is displayed in the first rectangle. The second rectangle is moved to a desired position within the first rectangle by a position indicating means such as a pointing device whereby the area the operator wishes to view is displayed in one quick operation.

Display screen control method

A terminal device having a keyboard and a display device and connected to a central processing unit through a line, wherein a display screen of the display device is divided into a first field and a second field and on-line processing data is displayed in the first field while off-line processing data is simultaneously displayed in the second field so that an operator can operate the keyboard to prepare a document in an off-line mode while the operator refers to the on-line data. The data displayed in the first field is a portion of the on-line processing data stored in a first buffer memory and the data displayed in the second field is a portion of the off-line processing data stored in a second buffer memory. The sizes and the locations of the data read from the respective buffer memories are designated by parameters on a display control table and the parameters are alterable by operation of the keyboard. Thus, the sizes of the first and second fields on the display are variable and the respective fields can be independently scrolled.

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Hadano, Japan

Kimitoshi Yamada