Hello, http://www.boostpro.com/vault/index.php?action=downloadfile&filename=boost-threadpool.v14.tar.gz&directory=Concurrent%20Programming& I've uploaded a new version of threadpool - fibers are remove so that fork/join is provided via recursive execution of sub-tasks (enqueued in local worker-queue). One open item is the synchronization of parent-task und sub-task (signaling via condition variables) - maybe solveable via fibers. regards, Oliver