Patents by Inventor Richard W. Cary

Richard W. Cary 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).

  • Version management system using plural control fields for synchronizing two versions of files in a multiprocessor system
    Patent number: 4875159
    Abstract: In a data processing system that stores a first and second version of a given data set, a method for synchronizing the first and second versions comprises steps of maintaining a sync-complete control field and a sync-in-progress control field in the inode of each of the first and second versions. Write accesses to the versions are modified so that the sync-complete control field and the sync-in-progress control field are cleared in response to any change in the associated version. The sync-complete control bits for the first and second versions are tested, and if either or both are cleared, then the sync-in-progress control field associated with a select source version is set. Next, a copy of the source version is transferred to a temporary file.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: October 17, 1989
    Assignee: Amdahl Corporation
    Inventors: Richard W. Cary, Richard D. Guyon