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Regarding Accessing a single file by two process.

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  • I Offline
    I Offline
    Indrajeet
    wrote on last edited by
    #1

    Hi All

    I have written a 2 functions to read & write a file.

    Problem:
    There is a single file which will be read or written by different processes.
    So how to avoid the process to read or write the file when some other process is performing the task on that file.
    or processes can read the file but if one process is writing that file at that time no other process should read it or write it.

    Please explain with example.

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    • L Offline
      L Offline
      lgeyer
      wrote on last edited by
      #2

      "QSystemSemaphore":http://doc.qt.nokia.com/latest/qsystemsemaphore.html (examples inside)

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      • K Offline
        K Offline
        KA51O
        wrote on last edited by
        #3

        "Again ?":http://developer.qt.nokia.com/forums/viewthread/7084/

        "QSystemSemaphore":http://developer.qt.nokia.com/doc/qt-4.7/qsystemsemaphore.html

        For more informations about your problem see "Readers-Writers-Problem":http://en.wikipedia.org/wiki/Readers-writers_problem

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        • T Offline
          T Offline
          tobias.hunger
          wrote on last edited by
          #4

          Closing this one as a duplicate of http://developer.qt.nokia.com/forums/viewthread/7084/.

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          • T Offline
            T Offline
            tobias.hunger
            wrote on last edited by
            #5

            ... and moved to general and desktop section as this is definitely not for the guru group.

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