[libcxx-commits] [PATCH] D94656: [libcxx testing] Fix UB in tests for std::lock_guard

[David Zarzycki via Phabricator via libcxx-commits]

davezarzycki added a comment.

I appreciate that you're trying to make this be defined behavior, but I honestly don't know why this is UB. I can't think of or find a platform where the underlying OS "trylock" routine would have UB when called on the same thread that owns the lock already. Can somebody with access to the C++ standard provide any hint to why the standard wants this to be UB?


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https://reviews.llvm.org/D94656