Shared "Integers"

This is a discussion on Shared "Integers" within the C Programming forums, part of the General Programming Boards category; How can you share integer values. With the functions given in C, it is only possible to allocate a flat ...

  1. #1
    char main() RoshanX's Avatar
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    Shared "Integers"

    How can you share integer values. With the functions given in C, it is only possible to allocate a flat memory space.

    if you have a shared memory area that with the starting address at INTEGER,

    Then this would give a runtime error

    *INTEGER=1;
    Is there a direct way of sharing an integer ?

  2. #2
    Confused Magos's Avatar
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    Share how? Between functions? Between modules? Between programs?
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  3. #3
    char main() RoshanX's Avatar
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    Sorry..should have been more specific.......share amoung processes..............

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    Obsessed with C chrismiceli's Avatar
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    this is compiler specific, in linux there are many ways including mapped memory and shared memory. Might want to look at shmget() and mmap().
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  5. #5
    char main() RoshanX's Avatar
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    I finally got the program working with MMAP().
    Question :
    I am not that clear about the working os MMAP. Does the shared memeory reside in a file . ?

  6. #6
    Obsessed with C chrismiceli's Avatar
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    from what I understand, it makes a file and makes it point to memory or something of that effect, then the other programs can read that memory.
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  7. #7
    Been here, done that.
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    Originally posted by RoshanX
    I finally got the program working with MMAP().
    Question :
    I am not that clear about the working os MMAP. Does the shared memeory reside in a file . ?
    Did you try google on "mmap() function"?

    One of many hits:
    http://www.opengroup.org/onlinepubs/...ions/mmap.html
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