Re: [xml] How and when to use LIBXML_THREAD_ALLOC_ENABLED

[Daniel Veillard <veillard redhat com>]

On Wed, Feb 04, 2004 at 02:21:25PM +0100, Kasimier Buchcik wrote:
> Hi,
>
> I'm currently playing with the various thread schemas supported by 
> libxml2 (ctls, posix and native) and came accross 
> LIBXML_THREAD_ALLOC_ENABLED in "globals.h". There it reads: "In general 
> the memory allocation entry points are not kept thread specific but this 
> can be overridden by LIBXML_THREAD_ALLOC_ENABLED".
>
> Since I've got only a slight image of what this could mean, I'm asking 
> if someone of you could explain what it does exactly (and when it's 
> usefull) and how to try it out, since my naive build with that 
> definition turned on, led to unresolved symbols (__xmlFree, __xmlMalloc, 
> etc.)

  Hum, the support might be broken right now but the idea behind it was
to have the memory allocation routine used (xmlMalloc, xmlFree ...)
be redefined to their __ counterparts, which then would use the per-thread
values that you can find in the xmlGlobalState structure (globals.h).
That way each thread was able to use its own memory pool. It's IMHO
a bit fragile, but that was the intent. I don't know why __xmlFree and
related definitions don't seems to exist anymore.

Daniel

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