[ITK] [ITK-dev] MatrixOffsetTransformBase::GetFixedParameters not ThreadSafe -- regression test?

[Williams, Norman K]

I was going to address this bug that I just logged:

https://issues.itk.org/jira/browse/ITK-3324

Basically, if GetFixedParameters is called from multiple threads, it introduces a race to resize the internal fixed parameter array.

This was never  a problem before Hans Johnson’s recent patch to propagate fixed parameters int Transform::GetInverse() methods.  He added:

inverse->SetFixedParameters(this->GetFixedParameters());

which makes perfect sense.

I have a decent idea of how to make this better:  Set the fixed parameters’ size in the constructor for MatrixOffsetTransformBase, and set the fixed parameters in SetCenter.  I will review the other instances of GetFixedParameters and GetParameters to see if they’re similarly thread-unsafe.

But how do you write a regression test for this?




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