`sig
exception Not_in_container_thread
val self_cont : unit -> Netplex_types.container
val log : Netplex_types.level -> string -> unit
val logf : Netplex_types.level -> ('a, unit, string, unit) format4 -> 'a
val register_par : Netplex_types.parallelizer -> unit
val register_cont :
Netplex_types.container -> Netplex_types.par_thread -> unit
val unregister_cont :
Netplex_types.container -> Netplex_types.par_thread -> unit
end`