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Papers:
[DATE’13]
Sequentially Constructive Concurrency: A Conservative Extension of the Synchronous Model of Computation.
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In essence, the SC MoC extends the classical synchronous MoC by allowing variables to be read and written in any order as long as sequentiality expressed in the program provides sufficient scheduling information to rule out race conditions. This allows to use programming patterns familiar from sequential programming, such as testing and later setting the value of a variable, which are forbidden in the standard synchronous MoC. The SC MoC is a conservative extension in that programs considered constructive in the common synchronous MoC are also SC and retain the same semantics. In this paper, we investigate classes of shared variable accesses, define SC admissible scheduling as a restriction of "free scheduling," derive the concept of sequential constructiveness, and present a priority-based scheduling algorithm for analyzing and compiling SC programs efficiently.
[CSIJC’13]
A Game Semantics for Instantaneous Esterel Reactions.
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Abstract. The present paper explains the constructive semantics of the synchronous language Estterel in terms of winning strategies in finite two–player games. The kernel fragment of Esterel considered here corresponds to combinational circuits and includes the statements for signal emission, status test, parallel composition and gives for the first time a game–theoretic interpretation to sequential composition and local signal declaration. This modelling shows how non-classical truth values induced by logic games can be used to characterise the constructive single-step semantics for Esterel.
[ESOP’14]
Grounding Synchronous Deterministic Concurrency in Sequential Programming.
J. Aguado, M. Mendler, R. von Hanxleden, I. Fuhrmann.
Proceedings of the 23rd European Symposium on Programming (ESOP'14), April 2014: 229-248.
Abstract. Using a new domain-theoretic characterisation we show that Berry’s constructive semantics is a conservative approximation of the recently proposed sequentially constructive (SC) model of computation. We prove that every Berry-constructive program is deterministic and deadlock-free under sequentially admissible scheduling. This gives, for the first time, a natural interpretation of Berry-constructiveness for shared-memory, multi-threaded programming in terms of synchronous cycle-based scheduling, where previous results were cast in terms of synchronous circuits. This opens the door to a direct mapping of Esterel’s signal mechanism into Boolean variables that can be set and reset under the programmer’s control within a tick. We illustrate the practical usefulness of this mapping by discussing how signal reincarnation is handled efficiently by this transformation, which is of linear complexity in program size, in contrast to earlier techniques that had quadratic overhead.
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