Multiple ChoiceHard 45s
Why compare_exchange_weak is preferred in loops
Why is compare_exchange_weak often preferred inside a CAS retry loop compared to compare_exchange_strong?
Options
- 1It never fails spuriously and so is always faster than compare_exchange_strong in any loop
- 2It provides stronger memory ordering guarantees than compare_exchange_strong on all platforms
- 3It cannot be used together with memory_order_relaxed, unlike compare_exchange_strong
- 4It may fail spuriously but can compile to cheaper instructions on some architectures
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