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orangejuiceliberationfront.com

One of the more confusing aspects of MacOS programming is the Handle. That doesn't have to be so. I'll quickly illustrate the history of the Handle and then everything should become clearer. I'll also include a little memory-management-101 at the beginning. Memory Fragmentation When you use malloc() or similar APIs to allocate memory, you face the problem of fragmentation: Imagine you have the following (top) situation in memory:   You have three blocks of memory: The blue one, the green one and the red one, each 6 bytes in length. Now, you dispose of the green one by calling free() (bottom). Now there's a six-byte hole between the two blocks. The total free memory (white blocks) is 108 bytes. Trouble is, since the computer can only allocate contiguous blocks of memory, the largest block you can allocate is 102 bytes.   Now, we can't just move the red block to the left to make more continuous free space available, because our program keeps track of each block by its position (its "address"), and moving it would change that address. The system would have to go through your program and change each occurrence of the moved block's address, which is simply impossible since only your program knows which parts of its memory are used for what. Not to mention it would cause pauses in execution. So, if you needed 103 bytes, you couldn't get them, even though we have 108 free bytes in total, more than we'd need.   Handles - a modern solution to fragmentation So, what Apple did is they created the Handle. A Handle is essentially a centralized way of storing pointers to memory blocks, so the system only has to change one centralized pointer when it needs to move a block to make more memory available.   Each pointer to the actual memory is owned by the system, and kept in a central table of pointers (the "master pointer block"). When you want to allocate memory, you ask the system to do it for you using the NewHandle() function. The system gives you a Handle, which is a pointer t

kdbg.org

kdbg is a graphical user interface to gdb, the gnu debugger.it provides an intuitive interface for setting breakpoints,inspecting variables, and stepping through code.

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sourceware.org

sourceware free software