ML Threads {SML/NJ} with mutual exclusion primitives similar to those in {Modula-2+} and {Mesa}. Written by Greg Morrisett <[email protected]>. {Lightweight threads} 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].