Method to share copy on write segment for mapped files

Details Method to share copy on write segment for mapped files Method to share copy on write segment for mapped files

G - Physics

06

F

354/241

G06F 12/10 (2006.01) G06F 9/48 (2006.01)

Patent

CA 1266532

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 to the SCOW command by the second process involving the same UNIX file checks the map node data structure to see if the file is currently mapped for the SCOW mode. Subsequent instructions in the application programs which are run concurrently on the virtual machines operate on the copy of the file in the unique segment so that any data that is changed, i.e. written by one process, is available to be read by the second process.

523241

Affiliated with

Also associated with

Rating

Method to share copy on write segment for mapped files does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method to share copy on write segment for mapped files, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to share copy on write segment for mapped files will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1295033