[Insight-users] multi-threading exception thrown

[Matei Stroila]

Dear all,

Is it safe to call an ITK filter from a thread?

I am writing an application that uses several threads to process
independently one image per thread. The processing consists in several
chained filters.  I run this on a  WinXP desktop with 2 dual-core
processors (Xeon CPU 3.73GHz) with hyperthreading, so total of 8
logical processors. I use seven threads for image processing. I have
ITK 3.0.  I use the wxWidgets threading classes.

I randomly get the following exception in different filters (this is
in a mask filter, it happened also in the watershed segmentation
filter):

Exception caught in mask filter:
d:\src\Insight\Code\Common\itkMultiThreader.cxx:368:
itk::ERROR: MultiThreader(31827EC0): Exception occurred during
SingleMethodExecute

I am not using directly the ITK multithreader class, but the filters I
use, use that.

I noticed that if I compile ITK with ITK_MAX_THREADS defined as 1,
this error no longer appeared, so far.

Thanks for help,

Matei