Download Inside Macintosh, Volume II by Apple Computer Inc PDF

By Apple Computer Inc

Quantity II covers dossier and gadget I/O, reminiscence administration and interrupt dealing with.

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Extra info for Inside Macintosh, Volume II

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If for some reason you want to compact or purge the heap explicitly, you can do so with CompactMem or PurgeMem. To explicitly purge a specific block, use EmptyHandle. W a r n i n g : Before attempting to access any purgeable block, you must check its handle to make sure the block is still allocated. If the handle is empty, then the block has been purged; before accessing it, you have to reallocate it by calling ReallocHandle, and then recreate its contents. ) You can find out how much free space is left in a heap zone by calling FreeMem (to get the total number of free bytes) or MaxMem (to get the size of the largest single free block and the maximum amount by which the zone can grow).

If the block's logical size is odd, an extra, unused byte is added at the end to keep the physical size even. • The rmnimum number of bytes in a block is 12. This minimum applies to all blocks, free as well as allocated. If allocating the required number of bytes from a free block would leave a fragment of fewer than 12 free bytes, the leftover bytes are included unused at the end of the newly allocated block instead of being returned to free storage. Structure of Master Pointers The master pointer to a relocatable block has the structure shown in Figure 14.

To do it safely, the code containing the SetApplBase call cannot be in the application zone. Result codes noErr 11-28 Memory Manager No error Routines The Memory PROCEDURE I n i t Z o n e (pGrowZone: P r o c P t r ; c M o r e M a s t e r s : limitPtr,startPtr: Ptr) ; Trap macro On entry Manager INTEGER; InitZone AO: pointer to parameter block Parameter block 0 4 8 10 On exit startPtr limitPtr cMoreMasters pGrowZone pointer pointer word pointer DO: result code (word) InitZone creates a new heap zone, initializes its header and trailer, and makes it the current zone.

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