[Insight-developers] Multithreaded exception handling in itkConnectedComponentImageFilter

[Hans Johnson]

Gaetan,

I've assigned this bug to you.

http://public.kitware.com/Bug/view.php?id=8839

Thank you for offering to look into this.

Hans



On 4/4/09 8:24 AM, "Johnson Hans" <hans-johnson at uiowa.edu> wrote:

> 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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