CThread
val prepare_in_channel_for_thread_friendly_io : Stdlib.in_channel -> thread_ic
val thread_friendly_input_value : thread_ic -> 'a
val thread_friendly_read : thread_ic -> Stdlib.Bytes.t -> off:int -> len:int -> int
val thread_friendly_really_read : thread_ic -> Stdlib.Bytes.t -> off:int -> len:int -> unit
val thread_friendly_really_read_line : thread_ic -> string