NDLI: A new concurrency model for Scala based on a declarative dataflow core

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A new concurrency model for Scala based on a declarative dataflow core

Content Provider	ACM Digital Library
Author	Doeraene, Sébastien Van Roy, Peter
Abstract	Declarative dataflow values are single assignment variables such that all operations needing their values wait automatically until the values are available. Adding threads and declarative dataflow values to a functional language gives declarative concurrency, a model in which concurrency is deterministic and explicit synchronization is not needed. In our experience, this greatly simplifies the writing of concurrent programs (as explained in several chapters of CTM [20]). We complete this model with lazy execution and message-passing concurrency. Both extensions are tightly integrated with the declarative dataflow core. Lazy execution is provided by extending declarative dataflow with a by-need synchronization operation. Message passing is provided by adding streams equipped with a send operation, where a stream is a list with an unbound single-assignment variable. This paper presents the Ozma language, a conservative extension of Scala that supports all these concepts. We have made a complete implementation of Ozma by combining the implementations of Scala and Oz. Evaluation shows that this implementation supports the full semantics of Scala with concurrent programs based on the new concurrency model. In particular, within the functional subset of Scala the new concurrency model fully supports deterministic concurrency.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781450320641
DOI	10.1145/2489837.2489841
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-07-02
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Scala Nondeterminism Lazy execution Ozma Oz Message-passing concurrency Dataflow Deterministic concurrency Concurrent programming
Content Type	Text
Resource Type	Article

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