From: dcasale AT my-deja DOT com
Newsgroups: comp.os.msdos.djgpp
Subject: Where is malloc info kept?
Date: Wed, 15 Nov 2000 19:04:22 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

It's me again, still plugging away at trying to debug my compression
program.  What's annoying is that I can run it on a small file set and
it works perfectly, but on a large file set it faults on a delete.

I'm wondering.  Where is the malloc info kept for each allocation?  Is
it in the bytes immediately prior to the returned pointer?  Somewhere
else entirely?

YAMD seems to like my small, sample file set.  I get no allocation
errors and only a few memory leaks from three fopen's and a printf
(which I assume are supposed to be there -- 3 32 byte allocations and a
16384 byte allocation, respectively).  But before it finishes on my
large file set and gets to the point where the fault on the delete
happens, it has a failed malloc.  According to both
_go32_dpmi_remaining_virtual_memory _and_
_go32_dpmi_remaining_physical_memory, I've got plenty of space before
any allocations should fail.

So what gives?  Could this be a case of memory corruption on my part, a
buggy DPMI server...what?

Any ideas?

Damon Casale, damon AT WRONG DOT redshift DOT com (remove the obvious)
"Maybe you have amnesia, brought on by...shock."
"Maybe.  I don't know, I can't remember."  -- Grace and the Doctor, Fox
Movie


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