[lxml-dev] Error with thread

[Hans-Jürgen Hay]

Hi,

I had the same problem with mod_python, a while ago, it seems mod_python
does some trickery with threads in its internals. The only solution I
found is setting

PythonInterpreter "myoneandonlyinterpreter"
 
in the apache config of each virtual host while running prefork servers.
I coudn't find any other solution beside hoping that the threading
problem in lxml will go away, sometime.

Hans

Am Montag, den 03.12.2007, 16:17 +0300 schrieb Dmitri Fedoruk:
> Hello,
> 
> Looks like I've got the same problem.
> Sometimes I get the same error message: 'stylesheet is not usable in
> this thread'. As far as I could understand, that's because of an
> attempt to use in one thread the xslt obejct initiated in another
> thread. Sounds reasonable.
> 
> > Correct. As I said, a work-around would be to either create them on the fly or
> > cache the XSLT objects in thread-local storage and reuse them from there.
> 
> Nice. My application works under the same scheme. I'm using mod_python
> and several apache processes started in prefork mode. In every apache
> process I'm using a global general object that contains xslt objects
> inside. When a request comes to the next apache process, my general
> object is initialized (if it has not been done yet) and then is used
> inside this thread and this process. I cannot see the reason why one
> instance of mod_python should conflict with another.
> 
> Nevertheless, I happen to get this error messages without any idea
> why. I can not see any dependency or rule yet. The only solution is to
> restart apache.
> 
> My software is the following:
> Apache/2.0.61
> Python 2.5.1
> mod_python-3.3.1
> lxml-1.3.4
> libxslt-1.1.20
> freebsd 6.2-20070330-SNAP
> 
> Do you have any idea how can I fix this situation or at least how can
> I track the reasons? Maybe this is the question for some other mailing
> lists too?
> 
> Dmitri
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