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From:	CBFalconer <cbfalconer AT yahoo DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: libstdc++ writev/2.04/patches upstream?
Date:	Sat, 19 Jul 2008 18:55:33 -0400
Organization:	Ched Research http://cbfalconer.home.att.net
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Andris Pavenis wrote:
> 
... snip ...
> 
> The first message of the thread is
>
> http://www.delorie.com/djgpp/mail-archives/browse.cgi?p=djgpp-workers/2007/12/05/17:54:46
> 
> I included there the source of my initial test program used for
> profiling. Remove shuffling addresses and freeing memory, link it
> with nmalloc and You will get what I use for testing when large
> enough number of allocations were specified (like more that
> 1000000, You should have plenty of memory for that). This test
> program randomly crashed when linked with nmalloc and never for
> me if with DJGPP v2.04 own malloc (for this test slowness of
> free() does not matter of course).
> 
> I do not know whether it is possible to reproduce the problem on
> system different from WinXP.

I have heard nothing back since my earlier replies about this
message.  I reported that the system doesn't compile or link,
depending on the parameters given to gcc.

I believe the basic problem is mixing the use of new/dispose with
malloc/free.  This can't be properly evaluated without pulling down
the whole C++ library system, or installing the revised malloc as a
portion of the C++ library.  That won't work if the C++ system
makes malloc depend on new.

As I see it you are generating a herd of mallocs with randomized
sizes, mixing them up, and then freeing all of them.  I have
performed other tests that effectively do this, with no problems. 
If I am correct I am even willing to write a C test routine to do
it, avoiding the mixing problems.

-- 
 [mail]: Chuck F (cbfalconer at maineline dot net) 
 [page]: <http://cbfalconer.home.att.net>
            Try the download section.

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