Hi to all, I've just finished implementing the lockable objects of Kevlin's proposal based on Boost mutexes and conditions. Since boost mutex operations are private and only available with locks, I haven't found a way to implement Kevlin's interface over boost threads without using some very nasty tricks. If someone has a better idea, let me know. The implementation nearly fills all the proposal of the documentation, so I will wait for new elements so that I can continue with this project. This elements are present in the current version: -> threader and joiner classes -> lockable, try_lockable, condition_lockable -> locker, try_locker -> locking_ptr There are open issues in the paper like timeout handling and new possible lockers, (for example, for conditional_lockable objects). As soon as I get more information I will continue developing it. Regards, Ion