Additions:

Deletions:

---

sqInt sqMemoryExtraBytesLeft(sqInt includingSwap)

Parms:
includingSwap If true use swap space in calculation

return: bytes allocated for squeak oops space, but not used
From: Interpreter
Why:
To give indication how much more the image could grow.

Responsibility:
This is very windows centric, it returns bytes left of allocated but not used space.
But on BSD systems we don't know or care about swap space size.

MacIntosh
os-9/OSXCarbon
return gMaxHeapSize - gHeapSize;

Cocoa:
TBD

iPhone
return gMaxHeapSize - gHeapSize;

Unix
if using mmap return heapLimit - heapSize, otherwise zero

Windows
normally it's mStat.dwAvailPhys, but if includingSwap then also include mStat.dwAvailPageFile
adjust to maxReserved space (MAX_VIRTUAL_MEMORY= 512mb)

BUGS
Most platforms have disagreement about what this means.