Adam: An Ada-based Language for Multiprocessing

نویسندگان

David C. Luckham

Friedrich W. von Henke

H. J. Larsen

Duncan Stevenson

چکیده

Adam is an experimental language derived from Ada. it was developed to facilitate study of issues in Ada implementation. The two primary objectives which motivated the development of Adam were. to program supervisory packages for multitask scheduling, and to formulate algorithms for compilation of Ada tasking. Adam Is a subset of the sequential program constructs of Ada combined with a set of parallel processing constructs which are lower level than Ada tasking. In addition, Adam places strong restrictions on sharing of global objects between processes. Import declarations and propagate declarations are included. A compiler has been implemented in Maclisp on a DEC PDP-10. It produces afsembly code for a PDP10. It supports separate compilation, generics, exceptions, and parallel processes. Algorithms translating Ada tasking into Adam parallel processing have been developed and implemented. An experimental compiler for most of the final Ada language design, including task types and task rendezvous constructs, based on the Adam compiler, is presently available on PDP10's. This compiler uses a procedure call implementation of task rendezvous, but will be used to develop and study alternate implementations. This research was supported by the Advanced Research Projects Agency of the Department of Defense under Contract MDA 903-80-C-0169. Appr'c'ed foyr uii r1B, r7' I ~ti~k v mt

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