Method to share copy on write segment for mapped files
CA 1266532 C · Owner: Duvall, Keith E. · Inventors: Loucks, Larry K.; Hooten, Anthony D.; Duvall, Keith E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
METHOD TO SHARE COPY_ON_WRITE, SEGMENT FOR MAPPED FILES ABSTRACT, A method for facilitating the interchange of data in a UNIX* file between two processes being run concurrently on two virtual machines in a page segmented virtual memory virtual machine type data processing system. A Shared Copy_On_Write (SCOW) command is created for the UNIX type operating system which when executed in response to a system call from one processes causes the specified UNIX file to be mapped to a unique segment of the virtual memory. A map node data structure is established for storing the ID of the unique segment and for maintaining a count value of the number of user sharing the unique segment. A system call …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.