Multiple ChoiceHard 45s
compare_exchange_weak vs strong
What is the practical difference between `compare_exchange_weak` and `compare_exchange_strong`?
Options
- 1Weak is the stronger form and never fails spuriously, while strong may fail even on a match.
- 2Weak may spuriously fail even when the value matches (requires a loop), but can be faster on LL/SC architectures; strong never spuriously fails.
- 3They are identical in behavior and differ only in the default memory ordering they assume.
- 4strong is only usable together with seq_cst ordering, while weak accepts any memory order.
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