Well this is interesting. Check out this data:
The environment:
CW6 on POSEr 3.0a3. Identical results were obtained using the 3.0 debug and
3.0 release ROM images from Palm's webpage.
The test code:
MemHeapFreeBytes(0, &freeInitial, &max);
CharPtr pTest = (CharPtr) MemPtrNew(x);
MemHeapFreeBytes(0, &freeFinal, &max);
delta = freeInitial - freeFinal;
x <- next value // pseudocode
repeat test code // pseudocode
The results:
x delta excess padding
1 16 15
2 10 8
3 14 11
4 12 8
5 14 9
6 18 12
7 16 9
8 16 8
9 18 9
10 18 8
20 28 8
30 38 8
40 48 8
Can someone explain what's going on here? Am I doing something silly? I
see that each chunk has the overhead of its own MemChunkHeaderType (I'm
guessing this takes up 8 bytes, or two DWords). I also assume DWord
alignment to be considered. But I can't put a finger on exactly what's
going on, especially with x=1, 3, and 6.
This is so much fun!
-Jeff
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