[corsix]

I’m pleased to see FUTEX2_SIZE_U64, but saddened that it isn’t actually implemented. It has always seemed like a very useful primitive to have.

[eqvinox]

[phone], it's seriously annoying to not be able to have a lock "superimposed" on a pointer (as done in lock-free datastructures, and particularly relevant for "intermediate" data structures where some operations can proceed lock-free but some block [e.g. hash table resizing])