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Lisp heap vs. Mac heap
- Subject: Lisp heap vs. Mac heap
- From: Michael Burks <email@example.com>
- Date: Tue, 22 Jun 1993 01:46:43 -0400 (EDT)
A result of -108 from #_NewGWorld or #_UpdateGWorld is a long
representing all of the flags set, including gwFlagErr. It means there
wasn't enough memory to allocate the bitmap you requested. Oddly, if
you get -108 from #_UpdateGWorld, it is OK to call #_UpdateGWorld again
with the CGrafPtr it returned, while if you get -108 from #_NewGWorld,
calling #_UpdateGworld on the CGrafptr returned results in a Bus Error.
I will send you some flag manipulation code I have written in a separate
message that should help.
We are all waiting for someone who knows to tell us how MCL manages its
heap(s?). I believe that there is only one heap, since if you request a
very large chunk of memory, LISP GCs. The only reason it would be doing
this is to try and get more space for the "real" memory you have
requested. Also, #_maxmem consistently returns 0. This is useless.
SOMEONE PLEASE CLARIFY THIS - Is there a way to find out the biggest
chunk of memory I can get without crashing LISP?