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Conventional languages are serial from statement to statement unless broken by explicit parenthesization such as BEGIN blocks or their equivalent in other languages. However, they are not serial within statements, but possess a complex priority scheme which seems to have little justification except historical notation in a few branches of mathematics. By(More)
The paper describes an efficient, portable implementation of interprocess communication which does not require modifications to the operating system. The ipc facility described supports communication between arbitrary processes even on systems, such as vanilla Unix V, which normally restrict communication to parent/child or sibling process pairs.(More)
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