[libcxx-commits] [libcxx] [libc++] Use public os_sync API instead of private __ulock on newer Apple platforms (PR #182947)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne commented:

This patch looks good to me, with a few suggested changes. I also noted some follow-ups we need to do or investigate as separate efforts.

https://github.com/llvm/llvm-project/pull/182947