AbstractThe formulation of concurrency and synchronization has been recognized as a matter of growing importance in system programming languages in order to achieve well‐structured, reliable and easy to understand system software such as operating systems. Unfortunately, only experimental languages, such as Concurrent Pascal or MODULA, contain adequate linguistic constructs for support of such concepts as processes and monitors. The compilers for those languages are available only on a few machines and are devoted primarily to education. In this paper a simple method of extending a PL/I‐like programming language by concurrency features is described which is based on the usage of an existing compiler. The method has proven to be a cost effective way of adopting recent research results in existing software engineering tools, thus avoiding the need of switching over to a completely new programming environm
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