Development of Multi-threaded applications
summary
Shows concrete code: uses QConcurrent + QFuture/QFutureWatcher to run a slow Fibonacci off the UI thread and keep the UI responsive; implements a real QAtomicPointer lock-free stack (push faster: 700ms→400ms; pop much faster: 2.5s→0.5s on dual‑core) and demonstrates the ABA problem with options (tagged pointers, hazard pointers, LL/SC). Explains Qt5 QMutex internals: atomic pointer states (0,1 or MutexPrivate), refcounted mutex privates, lock‑free free list and futex backend on Linux, and tradeoffs (fairness, timeouts).
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chapters (10)
- 0:00Introduction to talk
- 2:35When to use threading
- 3:58Demo of UI responsiveness
- 10:15Lock-free programming basics
- 13:44QAtomic API overview
- 17:55Lock-free stack implementation
- 21:21Benchmarking lock-free vs mutex
- 30:23ABA problem explained
- 35:04QMutex in Qt5 internals
- 49:49Questions and closing
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