Pascal‐plus—another language for modular multiprogramming

Abstract

This paper informally describes the programming language Pascal-Plus. The language is an extended version of Pascal, incorporating the enaelope construct which is an aid to program modularization and data abstraction, the process, monitor and condition constructs which provide a means for representing multiprocessing programs, and a simulation monitor which provides pseudo-time control facilities for multiprocessing programs.

Concepts and Notations for Concurrent Programming

“…Below, we very briefly discuss two of the most important: Concurrent PASCAL and Modula. These languages have received widespread use, introduced novel constructs to handle machine-dependent systems-programming issues, and inspired other language designs, such as Mesa [Mitchell et al, 1979] and PASCALPlus [Welsh and Bustard, 1979]. …”

Modules program structures and the structuring of operating systems

“…This concept is incorporated in several recent languages (ADA [I] (where it is called "package"), Concurrent Pascal[61 ( where it is called "classY'), Pascal Plus [17], LIS [13], MESA [15], Modula[19~, Modula-2[20~ and many others). Although details may differ from one language to another, the following description should suffice for the sake of this paper:…”

“…Note that this scheme is equally applicable for the "envelopes" of Pascal Plus [17], where each module consists of an initialisation part and a finalization part. At the borderline of the two, the successor module may be invoked.…”

Joyce—A programming language for distributed systems

“…Within ten years, half a dozen production-quality languages were monitor-based, among them Modula (Wirth 1977), Pascal-Plus (Welsh 1979), Mesa (Lampson 1980) and Concurrent Euclid (Holt 1982).…”