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Fri 22 Jan 2016 11:45 - 12:10 at Grand Bay South - Track 2: Semantics and memory models Chair(s): Alexey Gotsman

We introduce a strengthening of the release-acquire fragment of the C11 memory model that (i) forbids dubious behaviors that are not observed in any implementation; (ii) supports fence instructions that restore sequential consistency; and (iii) admits an equivalent intuitive operational semantics based on point-to-point communication. This strengthening has no additional implementation cost: it allows the same local optimizations as C11 release and acquire accesses, and has exactly the same compilation schemes to the x86-TSO and Power architectures. In fact, the compilation to Power is complete with respect to a recent axiomatic model of Power; that is, the compiled program exhibits exactly the same behaviors as the source one. Moreover, we provide criteria for placing enough fence instructions to ensure sequential consistency, and demonstrate their application to an efficient RCU implementation.

Poster (poster.pdf)1.58MiB

Fri 22 Jan

Displayed time zone: Guadalajara, Mexico City, Monterrey change

10:30 - 12:10
Track 2: Semantics and memory modelsResearch Papers at Grand Bay South
Chair(s): Alexey Gotsman IMDEA
10:30
25m
Talk
Modelling the ARMv8 Architecture, Operationally: Concurrency and ISA
Research Papers
Shaked Flur University of Cambridge, Kathryn E. Gray University of Cambridge, Christopher Pulte University of Cambridge, Susmit Sarkar University of St Andrews, Luc Maranget INRIA Rocquencourt, Ali Sezgin University of Cambridge, Will Deacon ARM Ltd., Peter Sewell University of Cambridge
Media Attached File Attached
10:55
25m
Talk
A concurrency semantics for relaxed atomics that permits optimisation and avoids thin-air executions
Research Papers
Jean Pichon-Pharabod University of Cambridge, Peter Sewell University of Cambridge
File Attached
11:20
25m
Talk
Overhauling SC atomics in C11 and OpenCL
Research Papers
John Wickerson Imperial College London, Mark Batty University of Cambridge, Alastair F. Donaldson Imperial College London
Pre-print File Attached
11:45
25m
Talk
Taming Release-Acquire Consistency
Research Papers
Ori Lahav MPI-SWS, Nick Giannarakis MPI-SWS, Viktor Vafeiadis MPI-SWS, Germany
Pre-print Media Attached File Attached