Thread Pool Elements

on YouTube ↗49m

" summary

Prototype thread pool implemented in C++20 inside Compiler Explorer uses a std::deque work queue, condition_variable, std::stop_source/stop_token and an atomic working counter, growing threads up to hardware_concurrency (which is two on Compiler Explorer). A real bug appears: capturing this in lambdas plus a resizing std::vector of thread contexts lets moved threads keep dangling pointers; reserving avoids it but doesn’t solve dynamic shrink/move. Sanitizers (thread sanitizer and memory sanitizer) catch the corruption; QThreadPool remains preferred for production.

AI-written summary · about

" chapters (16)

1. 0:00Introduction
2. 2:01Producer-consumer overview
3. 3:01Simple thread-safe container
4. 4:32Notification mechanisms
5. 7:12Use cases and design
6. 10:18Thread pool elements
7. 13:09QThreadPool approach
8. 14:51Execution context types
9. 17:28Scaling and locking
10. 18:07Mutex and sync details
11. 20:48Mutex strategies
12. 24:53Stop tokens and callbacks
13. 31:44Memory and error handling
14. 42:41Modern C++ execution
15. 45:06Coroutines and conclusions
16. 48:07Testing and future steps

" related talks

• 01h 07mAn Introduction to Multithreading in C++20Anthony Williams · CppCon 2022
• 59mThreads and Locks must GoRainer Grimm · Meeting C++ 2017
• 01h 04m[old version]The C++20 Synchrononization LibraryBryce Adelstein Lelbach · Meeting C++ 2019
• 01h 04mThe C++20 Synchronization LibraryBryce Adelstein Lelbach · Meeting C++ 2019
• 52mBest Practices for ConcurrencyRainer Grimm · Meeting C++ 2018
• 48mReal time 101Fabian Renn Giles, David Rowland · Meeting C++ 2019
• 01h 04mConcurrency TS2: Improved C++ Concurrency and Lock-free ProgrammingMichael S Wong, Maged M. Michael · CppCon 2023
• 01h 03m...Scaling Visualization in concurrent C++ programsF. Pikus · CppCon 2014