Source : Free On-Line Dictionary of Computing

ML Threads
     
        {SML/NJ} with mutual exclusion primitives similar to those in
        {Modula-2+} and {Mesa}.  Written by Greg Morrisett
        .
     
        {Lightweight thread}s are created using {fork}.  They are
        {pre-emptive}ly scheduled and communicate via {shared memory}
        which can be protected by a "{mutex}" ({monitor}).
     
        Implementations for {Motorola 68020}, {SPARC} and {MIPS} and
        {VAX}- and {MIPS}-based multiprocessors.
     
        ["Adding Threads to Standard ML", E. Cooper et al,
        CMU-CS-90-186, CMU Dec 1990].