Hi, Googling I found a thread "Boost.Threads. Anything happening?" (in July 2004) in comp.lang.c++.moderated that suggests there should be a development branch of the thread code that already supports this feature. Unfortunately I cannot find the right branch for it in the boost CVS (using the web CVS viewer). The thread_dev and thread_development branches I found do not appear to be the correct ones as they have not been changed for a very long time and the above mentioned thread suggests it would be a rather recently added feature. While I could add this feature myself for the platforms that I need, I would prefer to avoid duplicating work already done. Could someone point me where to find the branch referred to in the above mentioned comp.lang.c++.moderated thread? Regards, Thorsten Froehlich