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Saarland University Computer Science

Futures and By-need Synchronization

Michael Mehl, Christian Schulte, Gert Smolka

Technical Report, Programming Systems Lab, DFKI and Universit├Ąt des Saarlandes, DRAFT, May 1998

We propose a conservative extension of Oz that adds futures and by-need synchronization. Futures are read-only views of logic variables that make it possible to statically limit the scope in which a variable can be constrained. For instance, one can express with futures safe streams that cannot be assigned by their readers. By-need synchronization makes it possible to synchronize a thread on the event that a thread blocks on a future. It is used to express dynamic linking and lazy functions.

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