val named_condition : 'a -> 'b Lwt_condition.tval named_mvar : 'a -> 'b -> 'b Lwt_mvar.tval named_mvar_empty : 'a -> 'b Lwt_mvar.tMProf_traceval named_condition : 'a -> 'b Lwt_condition.tval named_mvar : 'a -> 'b -> 'b Lwt_mvar.tval named_mvar_empty : 'a -> 'b Lwt_mvar.t