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Thread: Dynamic Allocation?

  1. Jun 8th, 2003, 12:13 AM #1
    Darkwraith
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    Dynamic Allocation?

    Is there a way to dynamically allocate memory in the data segment? If so, how?
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  2. Jun 16th, 2003, 04:23 AM #2
    CornedBee
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    Which data segment? The segment referenced by ds or the .data segment in your exe?

    Dynamic allocation is OS-dependent. In Windows, you must call one of LocalAlloc, GlobalAlloc, HeapAlloc or VirtualAlloc (with the first two being deprecated). In Linux there's some system call too. In DOS, you need to implement a memory manager (I think).

    And of course you can't dynamically allocate space within your exe.
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  3. Jun 18th, 2003, 03:53 PM #3
    Darkwraith
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    Well this is all implemented for as a 16-bit DOS .exe (after linking of course.) I could use either DS or ES (maybe FS or GS if need be)

    This is all in assembler. Not one bit of it is in a higher level PL. (A very sick learning activity that I assigned myself so to learn the second of the five PLs that I need to know.)

    I might be able to implement a memory manager if need be and give an overflow if there is a problem. If you have any sources to accomplish this, please share.
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  4. Jun 18th, 2003, 04:53 PM #4
    CornedBee
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    I have this:
    http://cboard.cprogramming.com/

    They have a DOS board, and as I never have programmed for DOS (too young back then) I don't know that much about it.
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  6. Jun 18th, 2003, 06:03 PM #5
    Darkwraith
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    Basically, this is for a MS-DOS window that does not use the protected features of the processor.

    Thx for the source though.
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