[Pl-seminar] 11/04: Francesco Zappa Nardelli, Programming languages and concurrency: still tricky

Vincent St-Amour stamourv at ccs.neu.edu
Mon Nov 3 18:10:06 EST 2014

Reminder: Francesco is speaking tomorrow.


At Wed, 29 Oct 2014 16:35:07 -0400,
Vincent St-Amour wrote:
> NUPRL Seminar presents
> Francesco Zappa Nardelli
> 1:30 - 3:00
> Tuesday, 11/04 (non-standard day)
> Room 366 WVH (http://www.ccs.neu.edu/home/wand/directions.html)
> Programming languages and concurrency: still tricky
> Abstract:
> We will explore together the remarkable and disturbing fact that,
> currently, there is no really satisfactory proposal for the semantics of
> a general-purpose shared-memory concurrent programming language.  Flaws
> in the Java memory model are already known, we will focus instead on the
> recent C11 standard.  By leveraging the semantics of low-level relaxed
> atomic accesses (which allows programmers to take full advantage of
> weakly-ordered memory operations) we will show that, among other
> dreadful consequences, the C11 standard does not permit many common
> source-to-source program transformations (such as expression
> linearisation and “roach motel” reorderings) that modern compilers
> perform and that are deemed to be correct.  We will consider and
> evaluate a number of possible local fixes, some strengthening and some
> weakening the model.
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