[Insight-developers] Multithreaded exception handling in itkConnectedComponentImageFilter

[Hans Johnson]

Gaetan,

THANKS.
Hans



On 4/3/09 5:09 PM, "Gaëtan Lehmann" <gaetan.lehmann at jouy.inra.fr> wrote:

> 
> Hi Hans,
> 
> I've made the multithreaded part - I guess I've missed a case.
> I'll look at it soon.
> 
> Gaëtan
> 
> 
> 
> Le 3 avr. 09 à 23:08, Hans Johnson a écrit :
> 
>> All,
>> 
>> Sorry to complain, and not provide a fix.  But here is the
>> situation, I have a program that uses the
>> itkConnectedComponentImageFilter, and when I set
>> ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS=1,  the exception at line 345
>> is of src/include/InsightToolkit/BasicFilters/
>> itkConnectedComponentImageFilter.txx  is thrown (proper behavior)
>> 
>> When ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS=8;  the same code enters
>> into an infinite loop that never exits.
>> 
>>     336   if( threadId == 0 )
>>     337     {
>>     338     unsigned long int totalLabs = CreateConsecutive();
>>     339     m_ObjectCount = totalLabs;
>>     340     // check for overflow exception here
>>     341     if( totalLabs > static_cast<unsigned long int>(
>>     342             NumericTraits<OutputPixelType>::max() ) )
>>     343       {
>>     344       itkExceptionMacro(
>>     345         << "Number of objects greater than maximum of output
>> pixel type " );
>>     346       }
>>     347     }
>>     348   this->Wait();
>>     349
>> 
>> I was wondering what the correct behavior is supposed to be in a
>> case like this.
>> 
>> http://public.kitware.com/Bug/view.php?id=8839
>> 
>> 
>> Thanks,
>> Hans
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