Just for showing how Bordeaux-Threads can be considered almost universally portable. This is the list of Lisp implementations supported by Bordeaux Threads:

    - Armed Bear Common Lisp (ABCL)
    - Allegro Common Lisp (ACL)
    - CLISP
    - Clozure CL
    - CMUCL
    - Corman Lisp
    - Embeddable Common Lisp (ECL)
    - LispWorks
    - MCL
    - MKCL
    - Steel Bank Common Lisp (SBCL)
    - Scieneer CL