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We introduce a denotational semantic framework for shared-memory concurrentprograms in a C11-style memory model. This denotational approach is analternative to techniques based on "execution graphs" and axiomatizations, andit allows for compositional reasoning. Our semantics generalizes from traces(sequences of actions) to pomsets (partial orders of actions): instead oftraces and interleaving, we embrace "true" concurrency. We build on techniquesfrom our prior work that gives a denotational semantics to SPARC TSO. We addsupport for C11's wider range of memory orderings, e.g., acquire-release andrelaxed, and support for local variables and various synchronizationprimitives, while eliminating significant amounts of technical bookkeeping. Ourapproach features two main components. We first give programs a syntax-directeddenotation in terms of sets of pomsets of memory actions. We then give arace-detecting executional interpretation of pomsets using footprints and alocal view of state.

A denotational account of C11-style memory