Hello Ronald, I need a transactional thread specific context which can also be accesible from other threads during consistency checking. I've found in your library threadalert (available on the boost vault) the thread_member_ptr which corresponds completely to my needs. I'think that independently of the alert library the thread_member_ptr might be a good candidate to Boost. thread_specific_ptr behaves as a private member of a thread and thread_member_ptr as a public member. This seems a natural extension. BTW, it would be nice to be able to associate a cleanup function as it is the case of the thread_specific_ptr. If you need some help I would like to collaborate with you. Please, let me know what do you think. Best regards, Vicente Juan Botet Escribá