| commit | c358979d7f45fc7624abc2f14e6f36f25ac9acc0 | [log] [tgz] |
|---|---|---|
| author | Hui <hui.xie1990@gmail.com> | Sun Jul 06 09:23:19 2025 +0100 |
| committer | GitHub <noreply@github.com> | Sun Jul 06 09:23:19 2025 +0100 |
| tree | e8c9559a3cc3e6a398d047fbf5a9e6ff1739eab3 | |
| parent | ba7d78ac4597c99e1815646d711cf736ead4f54a [diff] |
[libc++] fix atomic::wait memory order (#146267) Fixes #109290 See the GH issue for the details. In conclusion, we have two issues in the `atomic<T>::wait` when `T` does not match our `contention_t`: - We don't have a total single order which can leads to missed notification based on the Herd7 simulation on relaxed architectural like PowerPC - We assumed the platform wait (`futex_wait`/`__ulock_wait`) has seq_cst barrier internally but there is no such guarantee
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