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Safe commits for transactional featherweight Java

Steffen, Martin; Tran, Thi Mai Thuong
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ResRep-392.pdf (157.5Kb)
Year
2009
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http://urn.nb.no/URN:NBN:no-34240

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  • Institutt for informatikk [3603]
Abstract
Transactions are a high-level alternative for low-level concurrencycontrol mechanisms such as locks, semaphores, monitors. A recent proposal for integrating transactional features into programming languages is Transactional Featherweight Java (TFJ), extending Featherweight Java by adding transactions. With support for nested and multi-threaded transactions, its transactional model is rather expressive. In particular, the constructs governing transactions —to start and to commit a transaction— can be used freely with a non-lexical scope. On the downside, this flexibility also allows for an incorrect use of these constructs, e.g., trying to perform a commit outside any transaction. To catch those kinds of errors, we introduce a static type and effect system for the safe use of transactions for TFJ. We prove the soundness of our type system by subject reduction.
 
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