Citrix

We're very excited to welcome you to the Portland C++ User's Group (PDXCPP) meetup for a Special Event! Join us in downtown Portland at our host, Citrix. Note that we are meeting on the SECOND Tuesday of the month rather than the usual third Tuesday.

https://www.citrix.com/

The evening will begin with pizza and beverages, and we are very pleased to welcome Bryce Adelstein Lelbach as our special guest speaker! Bryce will be giving a preview of his CppCon 2019 talk, "The C++20 synchronization library".

• The C++20 Syncronization Library: In the decade since C++11 shipped, the hardware landscape has changed drastically. 10 years ago, we were still in the early stages of the concurrent processing revolution; 2 to 4 hardware threads were common and more than 10 was "many". Our tolerance for synchronization latency was greater; we were willing to pay microseconds and milliseconds.

Today, dozens and hundreds of threads are common, and "many" means hundreds of thousands. Concurrent applications are plagued by contention challenges that were unimaginable a decade ago. With the traditional tools we have today, programmers often have to choose between unacceptable contention and unacceptable high latency when synchronizing between threads.

The C++20 synchronization library brings solutions - new lightweight synchronization primitives that can efficiently marshall hundreds of thousands of threads:

• std::atomic::wait/std::atomic::notify_*: Efficient atomic waiting.
• std::atomic_ref: Atomic operations on non-std::atomic objects.
• std::counting_semaphore: Lightweight access coordination.
• std::latch and std::barrier: Marshalling groups of threads.

In this example-oriented talk, you'll learn how and when to use these new tools to build scalable, modern C++ applications that can run in parallel on virtual any hardware, from embedded controllers to server CPUs to modern GPUs.

• About Bryce: Bryce Adelstein Lelbach has spent nearly a decade developing libraries in C++. Bryce is passionate about C++ evolution and is one of the leaders of the C++ community. He is an officer of ISO/IEC JTC1/SC22/WG21, the C++ Standards Committee. Bryce chairs both the C++ Committee's Tooling Study Group (SG15) and Library Evolution Incubator (SG18). He is the program chair for the C++Now and CppCon conferences, and the chief organizer of the Bay Area C++ User Group. On the C++ Committee, he has personally worked on the C++17 parallel algorithms, executors, futures, senders/receivers, multidimensional arrays, and modules. Bryce works at NVIDIA, where he leads the CUDA C++ core libraries team. He is one of the initial developers of the HPX parallel runtime system. He also helped start the LLVMLinux initiative and has occasionally contributed to the Boost C++ libraries.

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Do you use C++? Would you like to learn C++?

Writing an operating system, an autonomous multi-agent system, video game, or hacking on a Raspberry Pi? Stuck on a problem and need another point of view? Perhaps you know C++ and would like to interact with others who also have experience with the language?

Meet up with other C++ programmers to learn, share, and develop tips and tricks of the trade, find out what local C++ projects are happening, and especially to better understand modern C++! All experience levels are welcome: You aren't alone on your C++ journey!

Our group is different than some others in that we focus on "modern" C++. We discussion many aspects of the current-- or even future-- C++ standards.