Several Red Hat engineers attended the JTC1/SC22/WG21 C++ Standards Committee meetings in November 2017. This post focuses on the sessions of SG1, the study group on parallelism and concurrency. SG1 had a full schedule as usual, with Executors, Futures, and deferred reclamation mechanisms (e.g., RCU) being major discussion topics. We also started to track the state of proposals and topics we will need to discuss in a publicly accessible bug tracker. I have argued in the past that SG1 should...
Several Red Hat engineers attended the JTC1/SC22/WG21 C++ Standards Committee meetings in July 2017. This post focuses on the sessions of SG1, the study group on parallelism and concurrency. We discussed several synchronization-related proposals, improvements for futures, and, of course, executors. Also, I proposed a few steps that the SG1 community could take to get more efficient in how it conducts its work, which are all inspired by how successful open source projects work. Most of the proposals we discussed...
Several Red Hat engineers attended the JTC1/SC22/WG21 C++ Standards Committee meetings in March 2017. This post focuses on the sessions of SG1, the study group on parallelism and concurrency. The major topics of work of the week were (1) further polishing of the parallel algorithms in the C++17 draft, (2) making progress on the executors proposal (which provides mechanisms to control how parallel work is executed, for example on which resources), and (3) continuing work on proposals targeting the Concurrency...
Several Red Hat engineers recently attended the JTC1/SC22/WG21 C++ Standards Committee meetings in Oulu, Finland. This post focuses on the sessions of SG1 (the standards committee sub-group 1 - for concurrency and parallelism) as well as on coroutines-related sessions. Jason already gave an overview of the meeting in his post . SG1 prioritized proposals and issues affecting the (expected) C++17 standard, followed by proposals targeting the Concurrency TS or a future revision of the Parallelism TS. We also made some...
Several Red Hat engineers recently attended the JTC1/SC22/WG21 C++ Standards Committee meetings in March 2016 in Jacksonville, Florida, USA. This post focuses on the sessions of SG1 (the standards committee sub-group 1 - for concurrency and parallelism) and on several proposals related to coroutines. The biggest news from a parallelism and concurrency (P&C) perspective is that the Parallelism Technical Specification v1 was voted into the working draft of the standard. This means that C++17 will offer support for several parallel...
Several Red Hat engineers attended the JTC1/SC22/WG21 C++ Standards Committee meetings in May 2015 at Lenexa, Kansas, USA. This post focuses on the sessions of SG1, the study group on parallelism and concurrency. Finishing the Technical Specifications (TSes) was one major point on the agenda of SG1. The Parallelism TS (see this draft ) and the Transactional Memory TS (see this draft ) have been finalized for publication, and the Concurrency TS and has been made ready for a vote...
In this post, I will give examples of recent improvements to concurrent code in glibc, the GNU C library, in the upstream community project . In other words, this is code that can be executed by multiple threads at the same time and has to coordinate accesses to shared data using synchronization. While some of these improvements are user-visible, many of them are not but can serve as examples of how concurrent code in other code bases can be improved...
Several Red Hat engineers attended the JTC1/SC22/WG21 C++ Standards Committee meetings in November 2014 at Urbana-Champaign, IL, USA. This post focuses on the sessions of SG1, the study group on parallelism and concurrency, which met for the whole week to discuss proposals and work on the technical specifications (TS) for both parallelism and concurrency. SG1 mostly worked on finalizing the first revision of the Parallelism TS, and continued working on accepting proposals into the Concurrency TS. The Transactional Memory proposal...
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