Quant Dev C++ Interview Question: Implement Threadpool

Preparing for a coding interview? Try our SWE interview prep course: https://bit.ly/4sNIC3y Interviewed recently? Tell us about your experiences: https://www.aced.io/experiences Zack walks through how to implement a thread pool in C++, a common quant developer coding interview question. He explains why creating a thread for every task is too slow, then builds a thread pool with a mutex, condition variable, and task deque. He also covers how to pick a sensible default thread count and a logging race condition that most candidates miss. This coding interview features Zack Light: @zacklight 0:00 — Intro 1:15 — Why one thread per task is slow 3:20 — How a thread pool solves it 4:55 — 3 key ideas for interviews 5:50 — Member variables 6:55 — Why std::deque instead of std::queue 7:15 — Declaration order and destructors 8:35 — Choosing the number of threads 10:30 — Launching worker threads 11:20 — Stopping the pool and adding tasks safely 13:15 — The worker loop 14:40 — Example use case 15:20 — Logging: why output can interleave 18:30 — Fixing it with a proxy pattern 19:40 — Getting results with std::packaged_task Related videos: ► Quant Dev C++ Interview Question: Implement Shared Pointer: https://www.youtube.com/watch?v=-Sf_lMpppQg ► Quant Developer Mock Interview (with Coding Jesus & Zack Light): https://www.youtube.com/watch?v=-sz35Q8oXrk ► FAANG Coding Interview: Longest Substring Without Repeating Characters: https://www.youtube.com/watch?v=IPjHWQTRXa0 📩 Subscribe to Aced: https://bit.ly/aced_yt 💼 Follow us on LinkedIn: https://bit.ly/aced_li 🎵 Follow us on TikTok: https://bit.ly/aced_tiktok 📸 Follow us on Instagram: https://bit.ly/aced_ig ABOUT US We are the fastest-growing tech interview prep platform. Our courses, coaching, and community are built by people from Google, Meta, Anthropic, OpenAI, and more. Our courses cover product management, software engineering, system design, data science, and machine learning interviews — plus career coaching and a peer practice community. #coding #softwareengineering #tech #cpp #quantdev