OCaml Mutex module cannot be found

Question

I tried to use Mutex module, such as Mutex.create(), but compiler says Unbound module Mutex. Does it require some special namespace? Thanks

Answer 1

For toplevel:

ocaml -I +threads

# #load "unix.cma";;
# #load "threads.cma";;
# Mutex.create ();;
- : Mutex.t = <abstr>

For ocamlc:

ocamlc -thread unix.cma threads.cma src.ml

For ocamlopt:

ocamlopt -thread unix.cmxa threads.cmxa src.ml

For findlib:

ocamlfind ocamlc -thread -package threads -linkpkg src.ml