%T Compile\-Time Techniques for Mapping Loop Parallelism %A R. Sakellariou %E Andr\[`e] W. P. Bakkers %B Proceedings of WoTUG\-20: Parallel Programming and Java %X A synchronous extension to the library model for message passing (Inmos C, PVM, Parmacs, MPI, etc.) is presented. This extension, provides a comfortable expression of nested parallelism from inside the message passing model. Furthermode of being a valuable tool for the presentation and teaching of parallel algorithms, the computation results prove that an efficiency similar to or even bettern tahn the one obtained designing and implementing algorithms using the native language can be achieved.