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Can multiple processes access the same memory space? How is this achievable?

Discussion in 'Operating System' started by Sage_sage, Feb 21, 2012.

  1. Sage_sage

    Sage_sage New Member

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    Can multiple processes access the same memory space? How is this
    achievable?
     
  2. Scripting

    Scripting John Hoder

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  3. _eb75_

    _eb75_ New Member

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    As an illustrative example from Linux we can take a part from a manual page. The method with other operating systems is pretty the same.
    An application can ask shared memory with an other application from OS.
    -----------------------------------
    shmget - allocates a shared memory segment int shmget(key_t key, size_t size, int shmflg);

    shmget() returns the identifier of the shared memory segment associated with the value of the argument key. A new shared memory segment, with size equal to the value of size rounded up to a multiple of PAGE_SIZE, is created if key has the value IPC_PRIVATE or key isn't IPC_PRIVATE, no shared memory segment corresponding to key exists, and IPC_CREAT is specified in shmflg.
    .........................
     

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