[pkhuong]

I see a lot of people asking for a real use case. If you follow the reference chain in the first aside, you'll find this blog post of mine https://pvk.ca/Blog/2020/07/07/flatter-wait-free-hazard-poin.... where we use value speculation to keep MOVS out of the critical path in an interrupt-atomic read sequence for hazard pointers.

[Remnant44]

Very nice! I was struggling to come up with a realistic real world scenario for value speculation, but this is a perfect example. Any kind of multi-thread/contention related code seems like an ideal target for making a guess-based fast-path corrected by a slow-path consistency check

[gpderetta]

Went for the speculation example, stayed for the interrupt-atomic memory copy. Great article.