atomic_try_update - A more, better compare-and-swap
summary
Provides small wrapper functions that replace manual CAS loops with a lambda that computes the new value and optionally whether to perform the swap, simplifying common patterns like counting strings or folding a 64-bit time into 32 bits. Uses standard atomics under the hood and chooses the four‑argument compare_exchange form to satisfy Clang. Shows a claim-bit plus ABA counter example for lockless work stealing, avoids unnecessary CAS attempts for a measurable perf win, and improves readability. atomic_update atomic_try_update
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chapters (5)
- 0:00Introduction to Atomic
- 0:31Challenges with atomic loads
- 2:22Atomic update wrapper
- 3:43Atomic try update
- 4:43Complex state and conclusion
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