Patents by Inventor Tetsuo Murakawa

Tetsuo Murakawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Multiprocessing system comparing information copied from extended storage before and after processing for serializing access to shared resource
    Patent number: 5251318
    Abstract: In a composite data processing system including a plurality of data processing units each containing one or a plurality of instruction processors and a main storage accessed by the instruction processor, and an extended storage shared by the data processing units and accessed by each of the instruction processors, the present invention provides a composite data processing system characterized by including a means for referring to a designated area on the extended storage by each of the instruction processors, a means for rewriting the area described above in accordance with the value of part of the entire part of the area based on the result of a referring operation and a means for generating an instruction for executing the operations from the reference operation to the rewrite operation as an inseparable operation.
    Type: Grant
    Filed: August 23, 1989
    Date of Patent: October 5, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Jun Nitta, Shigeru Yoneda, Tetsuo Murakawa