Amiga Computing - Commodore Is Awesome

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• 64 A ILOCATION AND I DEALLOCATION From time to time in my assembler columns etc_ I've talked about my stack-based schemes used to handle allocation and deallocation operations. Now you are going to get the chance to see how I do it from C when several different code modules are in use. Stacks, of course, store things on a last in First out basis and what my scheme does is ensure that ANY routine which successfully allocates or opens some returnable or closeable system resource pushes the address of a corresponding closedown routine onto a stack. To allow for allocation failures as the program runs, I adopt the convention of having all allocation routines return error numbers that indicate whether they've succeeded or not Providing these conventions are followed, a program is able to perform its closedown operations by using a loop to pull those deallocation routine pointers from the stack and executing the corresponding routines. The beauty of this approach is that the stack automatically deallocates things in the reverse order to the original allocations - things which are allocated last get deallocated first (a good, safe, general method to adopt with all <strong>Amiga</strong> programs). How do I set up the allocation/de-allocation code and get the right pieces of code executed at the appropriate times? The best idea is to look at some example fragments. Listing 1 shows two routines which open and close the Intuition library. Notice that the UWE AllocateResourtelLIEWE tount,WITE f*listC3)Evoid)) UWE i, error_ntiober; for (i:0;1
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256 A A COLOURS • 3D RAYTRACED GR
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