A much better solution to the ABA problem is to use load-linked and store-conditional instructions [1] on platforms where they are available (ARM, RISC-V, etc.)
Unfortunately x86 is not one of them. That's when CMPXCHG16B on x86-64 comes in handy, as per the linked article. But if you're going to write library code in 2025, it should at least support x86 and ARM.
Which brings up a more interesting argument IMO: platform fragmentation. Rust has approximately 1.5 advantages over C/C++. To displace them in a reasonable time, it probably needed 4 or 5. Its most significant contribution for the foreseeable future is platform fragmentation.
Unfortunately x86 is not one of them. That's when CMPXCHG16B on x86-64 comes in handy, as per the linked article. But if you're going to write library code in 2025, it should at least support x86 and ARM.
Which brings up a more interesting argument IMO: platform fragmentation. Rust has approximately 1.5 advantages over C/C++. To displace them in a reasonable time, it probably needed 4 or 5. Its most significant contribution for the foreseeable future is platform fragmentation.
[1] https://en.wikipedia.org/wiki/Load-link/store-conditional