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| Content Provider | ACM Digital Library |
|---|---|
| Author | Sarkar, Susmit Owens, Scott Memarian, Kayvan Batty, Mark Sewell, Peter |
| Abstract | The upcoming C and C++ revised standards add concurrency to the languages, for the first time, in the form of a subtle *relaxed memory model* (the *C++11 model*). This aims to permit compiler optimisation and to accommodate the differing relaxed-memory behaviours of mainstream multiprocessors, combining simple semantics for most code with high-performance *low-level atomics* for concurrency libraries. In this paper, we first establish two simpler but provably equivalent models for C++11, one for the full language and another for the subset without consume operations. Subsetting further to the fragment without low-level atomics, we identify a subtlety arising from atomic initialisation and prove that, under an additional condition, the model is equivalent to sequential consistency for race-free programs. We then prove our main result, the correctness of two proposed compilation schemes for the C++11 load and store concurrency primitives to Power assembly, having noted that an earlier proposal was flawed. (The main ideas apply also to ARM, which has a similar relaxed memory architecture.) This should inform the ongoing development of production compilers for C++11 and C1x, clarifies what properties of the machine architecture are required, and builds confidence in the C++11 and Power semantics. |
| Starting Page | 509 |
| Ending Page | 520 |
| Page Count | 12 |
| File Format | PDF MP4 |
| ISBN | 9781450310833 |
| DOI | 10.1145/2103656.2103717 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2012-01-25 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Semantics Relaxed memory models |
| Content Type | Audio Text |
| Resource Type | Article |
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