The problem is worse than I thought. CompositeTransform::GetFixedParameters() dynamically resizes the FixedParameters array, and then does a bunch of std::copy to copy fixed parameters out of its list of sub-transforms.
The only way to make that thread safe is to use a Mutex lock to guard where it changes the member variable. From: <Williams>, Mushly McMushmaster <[email protected]<mailto:[email protected]>> Date: Friday, October 24, 2014 at 11:45 AM To: ITK <[email protected]<mailto:[email protected]>> Subject: [ITK-dev] MatrixOffsetTransformBase::GetFixedParameters not ThreadSafe -- regression test? 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? ________________________________ Notice: This UI Health Care e-mail (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. 2510-2521, is confidential and may be legally privileged. If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you. ________________________________ ________________________________ Notice: This UI Health Care e-mail (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. 2510-2521, is confidential and may be legally privileged. If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you. ________________________________
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