[Insight-developers] ImageRegionConstIterator - thread safe?

[M Stauffer (V)]

Thanks Luis. This may actually end up being moot for the case of
itkBSplineDeformaableTransform since we're planning on replacing this
with Nick's new BSpline transform based on DeformationFieldTransform.

Yes, a more certain way to test for thread-safety would be wonderful!
Maybe we could cook up a test option that specifies to run tests that
are designated as testing thread-safety many times (e.g. 1000x) instead
of the single run in a normal test run? These could be run periodically
to avoid having each test run take more time. 

Maybe a cmake var THREAD_SAFETY_TEST_REPITITIONS that is usually 1, but
gets set to 1000 (or 10000??) once a week or month or so, and individual
tests can pull in the var through the command params in CMakeLists and
use it for their testing loop as appropriate.

We could do this manually for individual tests of course, but seems it
would give a more peace of mind to be able to do this on lots of
different platforms periodically.

-M

>-----Original Message-----
>From: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
>Sent: Sunday, April 10, 2011 6:38 PM
>To: M Stauffer (V)
>Cc: ITK-dev-list-mstauff at ver
>Subject: Re: [Insight-developers] ImageRegionConstIterator - 
>thread safe?
>
>Hi Marius,
>
>I would think that it is thread-safe,
>
>at least in the sense that a "Const" iterator
>will not modify its internal member variables.
>
>A "grep" didn't return any instances of "mutable"
>in this family of classes either,
>
>So it looks safe...
>
>I wish there was a less uncertain way of
>making this determination...
>
>
>      Luis
>
>
>-----------------------------------------------------------
>On Tue, Apr 5, 2011 at 5:18 PM, M Stauffer (V) 
><mstauff at verizon.net> wrote:
>> Hi,
>>
>> Does anyone know if ImageRegionConstIterator is thread-safe for
>> read-only operations?
>>
>> I'm trying to determine the thread-safety of
>> itkBSplineDeformaableTransform::TransformPoint( const 
>InputPointType &
>> point, OutputPointType & outputPoint,  WeightsType & weights,
>> ParameterIndexArrayType & indices, bool & inside). The
>> ImageRegionConstIterator used here is the only unknown for me at this
>> point, the rest of it looks thread-safe.
>>
>> I can look at ImageRegionConstIterator myself in detail, but 
>thought I'd
>> check first if someone else already knows.
>>
>> Cheers,
>> Michael
>>
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