Hi, I've read recently about timed locks throwing an exception when there is a timeout. What do you think about this behaviour? Could the thread library provide both? Next follows a piece of code without exceptions while (polling) { t=now()+100; boost::unique_lock<boost::mutex> l1(m1, t); if (l1.has_lock() { boost::unique_lock<boost::mutex> l2(m2, t); if (l2.has_lock() { boost::unique_lock<boost::mutex> l3(m3, t); if (l2.has_lock() { foo(); polling = false; } else execute_on_failed(); } else execute_on_failed(); } else execute_on_failed(); } and now with exceptions while (polling) try { t=now()+100; boost::exception_unique_lock<boost::mutex> l1(m1, t); boost::exception_unique_lock<boost::mutex> l2(m2, t); boost::exception_unique_lock<boost::mutex> l3(m3, t); foo(); polling = false; } catch (timeout_exception& ex) {execute_on_failed(); } What do you think about a try_lock_until, try_lock_for functions while (polling) try { boost::try_lock_for(100, m1, m2, m3); foo(); polling = false; } catch (timeout_exception& ex) {execute_on_failed(); } Best, Vicente