Suggestions for stream based parallel systems in Ada

Ada provides good support for the implementation of dependable, real-time, control systems. However, its support for other styles of systems is not as good. This paper explores the support available for implementing parallel, stream based systems. The paper presents an implementation of an image manipulation system which highlights deficiencies in the support for such systems in the Ada language. Two additional semantics are proposed for addition to the Ada language which will provide for the needs of these systems. The broadcast semantic allows the same data to be written to several POs simultaneously. The guarded protected function semantic permits several readers to wait on an entry and simultaneously read data from the PO.