Procs and Locks: A Portable Multiprocessing Platform for Standard ML of New Jersey J. Gregory Morrisett and Andrew Tolmach. We have designed a portable interface between shared-memory multiprocessors and Standard ML of New Jersey. The interface is based on the conventional kernel thread model and provides facilities that can be used to implement user-level thread packages. The interface supports experimentation with different thread scheduling policies and synchronization constructs. It has been ported to three different multiprocessors and used to construct a general purpose, user-level thread package. In this paper, we discuss the interface and its implementation and performance, with emphasis on the Silicon Graphics 4D/380S multiprocessor.