Re: [xml] xmlParserCtxt Leak?

[Michael Tremel <itrekkie gmail com>]

Thank you for your reply. I realize that I may have been brush in  
accusing your work; I apologize. I've made the changes you've  
suggested, but the same results from Valgrind keep showing up. Even  
after adding xmlParserCleanup(), there are 10 allocs and 9 frees  
leaving 84 bytes "still reachable". I can post more information if you  
need it, and I will try to compile this against a library with mem- 
debug as soon as possible.

Also, while I am a beginner, I have read everything there is to read  
on xmlsoft.org. I'll take a look myself at the source, but I simply  
felt it was better left in the hands of people who know what they're  
doing.

Thank you,
Michael


On Jun 15, 2008, at 4:22 AM, Daniel Veillard wrote:

> On Fri, Jun 13, 2008 at 05:00:02PM -0700, mt2 wrote:
> > Hello all,
> > I've just started using xmlParserCtxtInit() and friends to create a
> > reusable parser to parse lots of documents in a row (this is the  
> > right
> > thing to do, keep the parser context alive and parse new documents)
> > though I've detected what I think is a memory leak. I wrote a small
>
>  Ho did you detected that ? There is many way people usually get  
> fooled
> just because they don't understand how memory allocators work.
>
> > program to test the way I am working with libxml. If I am reading
> > valgrind's output correctly (there's a real change I'm not) this  
> > small
> > program is missing one free(); I've attached it's output, too.
>
>  you're missing one call at the end of the program
>
> > Finally, I might be using the parser API incorrectly (and there's a
> > good chance for that), so if anyone could point me in the right
> > direction there, too, I'd be much obliged. Also,
>
>  No idea as you didn't provide an exemple reproducing a leak here.
>
> > xmlMemoryDump() doesn't seem to output anything? On Ubuntu, I'm using
>
>  probably because it wasn't compiled with memory debug, which is  
> normal
> as it's not a default.
>
> > 2.6.31, and on Windows I'm using 2.6.32; I've reproduced this on both
> > platforms-- I'm at a loss here...
> >
> > #include <libxml/parser.h>
> >
> > int main()
> > {
> >         xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
> >         xmlInitParserCtxt(ctxt);
> >
> >         xmlFreeParserCtxt(ctxt);
> >         
> >        xmlMemoryDump();
>
>        xmlCleanupParser() missing at the end of the program
>
> >         return 0;
> > }
>
>  What about reading the documentation ?
>
>    http://xmlsoft.org/xmlmem.html
>
> Daniel
>
> --
> Red Hat Virtualization group http://redhat.com/virtualization/
> Daniel Veillard      | virtualization library  http://libvirt.org/
> veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
> http://veillard.com/ | Rpmfind RPM search engine  http://rpmfind.net/