[lxml-dev] Python crash with lxml use with multi-thread

[Pedro Cardoso]

Stefan Behnel wrote:
> Pedro Cardoso wrote:
>   
>> I am using lxml (just updated to version 1.3.6) on python 2.5, on a 
>> windows XP machine.
>>
>> I have a wrapper class for an XML file, and worked fine until I used it 
>> on several threads. At that moment it will crash.
>>
>> The piece of code I have it :
>>             projectNode = self.dom.xpath('//Project[@Code="%s"]' 
>> %projectCode)[0]
>>             logger.debug("here")
>>             previewsTask = self.dom.xpath('//Task[@Code="%s"]' % 
>> taskData.xml_Code)[0]
>>             logger.debug("here")
>>             projectNode.replace(previewsTask, taskData.dom)
>>             #projectNode.remove(previewsTask)
>>             #projectNode.append(taskData.dom)
>>             logger.debug("here")
>>             self.save()
>>             logger.debug("here")
>>             return None
>> The loggin is to know the last line to be called .
>>
>> The last log msg is written, but the one right after the call to this 
>> function is not, that makes me think the crash is on the return. There 
>> should be no problem of thread safety, since I am using locks.
>>
>> The crash seems to be on the return, and The calling sequence is :
>>     thread 1 : append a node to xml and save
>>     thread 2 : replaces node and save (the piece of code above)
>>        At this moment it crash python !
>>
>> Any idea of the problem ?
>>     
>
> Have you read the FAQ section on threading?
>
> http://codespeak.net/lxml/dev/FAQ.html#id1
>
> Stefan
>
>
>   
Ok, I feel stupid now ! Problem fixed.
Thanks.

Pedro