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Transactional events1
Published online by Cambridge University Press: 30 October 2008
Abstract
Concurrent programs require high-level abstractions in order to manage complexity and enable compositional reasoning. In this paper, we introduce a novel concurrency abstraction, dubbed transactional events, which combines first-class synchronous message passing events with all-or-nothing transactions. This combination enables simple solutions to interesting problems in concurrent programming. For example, guarded synchronous receive can be implemented as an abstract transactional event, whereas in other languages it requires a non-abstract, non-modular protocol. As another example, three-way rendezvous can be implemented as an abstract transactional event, which is impossible using first-class events alone. Both solutions are easy to code and easy to reason about.
The expressive power of transactional events arises from a sequencing combinator whose semantics enforces an all-or-nothing transactional property – either both of the constituent events synchronize in sequence or neither of them synchronizes. This sequencing combinator, along with a non-deterministic choice combinator, gives transactional events the compositional structure of a monad-with-plus. We provide a formal semantics for transactional events and give a detailed account of an implementation.
- Type
- Articles
- Information
- Journal of Functional Programming , Volume 18 , Special Double Issue 5-6 , September 2008 , pp. 649 - 706
- Copyright
- Copyright © Cambridge University Press 2008
Footnotes
This is a revised and extended version of the paper that appeared in the Eleventh ACM SIGPLAN International Conference on Functional Programming (ICFP'06) (Donnelly & Fluet, 2006).
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