malloc, realloc

This is a discussion on malloc, realloc within the C Programming forums, part of the General Programming Boards category; Currently, I create a processElement which has resource array & request array. These 2 arrays will be expanded in the ...

  1. #1
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    malloc, realloc

    Currently, I create a processElement which has resource array & request
    array. These 2 arrays will be expanded in the later stage for storage.

    i.e.
    process = (process_type*) malloc( sizeof(process_type) );
    resource = (resource_type**) malloc( resourceNum*sizeof(resource_type*) );
    request = (request_type**) malloc( requestNum*sizeof(resource_type*) );
    (Do I malloc correctly?)

    then
    resource = (resource_type**)realloc(resource,
    growthSize*resourceNum*sizeof(resource_type*));

    after realloc, I check the resource[0] has the number I want, but
    I can't access resoruce[1], ect. It is seg fault. I am not sure
    the behaviour of realloc. As I know, resource sits inside the
    realloc may cause mem leak. Is it the cause?

    regards
    figo2476

  2. #2
    Just Lurking Dave_Sinkula's Avatar
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    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
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    I tries this 2 ways. It is still seg fault.
    ...........

  4. #4
    Just Lurking Dave_Sinkula's Avatar
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    Try to trim your code down into a reasonably-size snippet that demonstrates the problem, and post the actual code. (That means the stuff besides the lines you think are causing the problem.)
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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