[Insight-developers] ThreadedHalt

[Paul Yushkevich]

Hello,

I have just checked in a small change to the FiniteDifferenceImageFilter 
and some of its children. There was a problem with SNAP on 
multiprocessor machines, and this was designed to help aleviate this 
problem.

The problem was that SNAP does a "loopback" to the user interface in the 
Halt method. In ParallelSparseLSFilter, however, Halt is called from 
each of the threads, and that was causing major crashes. So I added a 
ThreadedHalt method that takes as a parameter a ThreadInfoStruct * 
disguised as a void *, so that I can check the current ThreadID in the 
Halt method. The default implementation of ThreadedHalt is to call Halt, 
so no user code needs to be changed.

So I just wanted to give a heads up, especially to Josh, since this is 
his code.

Paul.