Wait-Free Hazard Pointers Using Std Atomics

A few ways to do wait-free hazard pointers, some portable, semi-portable, or not so much in this an subsequent blog posts. It's pretty high level, I'm assuming one knows how asymetric memory barriers and hazard pointers without the store/load memory barrier work.

Wait-free is interesting more from an academic point of view in that you can use hazard pointers to implement wait-free algorithms and still claim they are wait-free.

While one of them is 50% faster than lock-free hazard pointers, probably due to not having a conditional branch, the latter is pretty fast already.