> FWIW, C++ defines this as (in https://eel.is/c++draft/atomics#order-11): > > Implementations should make atomic stores visible to atomic > loads within a reasonable amount of time. > > in other words: > > if one thread does an atomic store, then all other threads must see that > store eventually. > > (from: https://rust-lang.zulipchat.com/#narrow/stream/136281-t-lang.2Fwg-unsafe-code-guidelines/topic/Rust.20forward.20progress.20guarantees/near/294702950) > > Should we add something somewhere in our model, maybe in the > explanation.txt? FYI, that's briefly mentioned in Section 11, "CACHE COHERENCE AND THE COHERENCE ORDER RELATION: co, coi, and coe": "sequential consistency per variable and cache coherence mean the same thing except that cache coherence includes an extra requirement that every store eventually becomes visible to every CPU" Andrea > Plus, I think we cannot express this in Herd because Herd uses > graph-based model (axiomatic model) instead of an operational model to > describe the model: axiomatic model cannot describe "something will > eventually happen". There was also some discussion in the zulip steam > of Rust unsafe-code-guidelines.
