Hello again, in the meantime this issue has been resolved, sorry for stealing your time. It simply was a missing pthread_self(). However, i'd still be interested if this actually is the best solution for my problem. Greetings Marc Roessler - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html