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:
See iPhone
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.
