Control of sequence and parallelism in modular programs

A variety of schemes for the specification and operation of parallel computation have been described recently (see also references in Gosden). For the most part, the proposed systems are concerned with parallelism on a detailed or statement level. Furthermore, as argued by Wirth, the proposals are not at a truly procedure- or problem-oriented language level but represent transliterations of machine or process-oriented operations. Notable exceptions to this are the and and shared statements of Wirth, and the parallel for Gosden (similarly the DO TOGETHER in Opler).