Hello, sorry for slight OT but as for now there is a discussion which is entittled future of threads I wonder why those additions( which were mentioned here http://www.cuj.com/documents/s=8470/cuj0205kempf/ There will be a boost::read_write_mutex, which will allow multiple threads to read from the shared resource at the same time, but will ensure exclusive access to any threads writing to the shared resource. There will also be a boost::thread_barrier, which will make a set of threads wait until all threads have "entered" the barrier. A boost::thread_pool is also planned to allow for short routines to be executed asynchronously without the need to create or destroy a thread each time. ) are stilll not in the main tree? not finished patches ( have some shortcomings )are here http://groups.yahoo.com/group/boost/files/thread_pool.zip http://groups.yahoo.com/group/boost/files/thread_barrier_v2.zip http://groups.yahoo.com/group/boost/files/thread_rw_lock_v2.zip Regards Serge