This seemed like a reasonable overview of "futex-like" functionality on things other than Linux: https://shift.click/blog/futex-like-apis/ https://shift.click/b

This seemed like a reasonable overview of "futex-like" functionality on things other than Linux: https://shift.click/blog/futex-like-apis/ https://shift.click/blog/futex-like-apis/ As you say, it's not straightforward.