On Thu, 8 Sep 2011, Nicolas Chauvet wrote: > I forward to the lcms-users mailing list this case: > https://bugzilla.redhat.com/show_bug.cgi?id=607758 > > This appends with lcms1, having lcms2 installed at the same time. > > Thx for your hints.
It is not clear that this issue is due to lcms. The application seems to be using OpenMP and is likely using lcms to perform transforms using multiple threads. The multi-threaded nature may explain why behavior has not been consistent. In my experience, it is not safe to create lcms tranforms in threaded context with lcms 1.X and it seems that ufraw may be doing that. The thread safety issues are related to the profiles used. Perhaps lcms2 does better at this since it tries to be more thread safe but I have not tried that yet. It is possible to build a thread-safe lcms but then it will run like a turtle. Although it is considerable work to get set up, I recommend using Valgrind's "helgrind" mode to verify concurrency in the program. Any shared variables accessed without the protection of a lock will be reported. The reason why this is considerable work to get set up is that one must replace the system libgomp.so with one built with one from the same GCC release but configured to use POSIX threads rather than Linux-specific interfaces. The results can be quite revealing and are worth the effort. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
