Hi, "The folowing should be added template<typename TimeDuration?> bool shared_mutex::timed_lock_shared(TimeDuration? const & relative_time); template<typename TimeDuration?> bool shared_mutex::timed_lock(TimeDuration? const & relative_time); " Anthony, I think that this ticket is already on the released shared_mutex.hpp files: template<typename TimeDuration> bool timed_lock_shared(TimeDuration const & relative_time) { return timed_lock_shared(get_system_time()+relative_time); } template<typename TimeDuration> bool timed_lock(TimeDuration const & relative_time) { return timed_lock(get_system_time()+relative_time); } So it can be closed. Best, _____________________ Vicente Juan Botet Escribá