[libc-commits] [libc] [libc] Implement simple lock-free stack data structure (PR #83026)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

Given that the stack is of a fixed size (i.e. there cannot be too many different tags). Is ABA still a concern? 

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I am not exactly sure about the GPU's assumption. On CPU ends, the dtor list used by `atexit` should be MPSC and the  consumptions can only happen at the end of the program without concurrency. ~~There is no concurrent reclamation of the stack cell at all. ~~

I was wrong, the exit call can be initiated at multiple threads concurrently.

https://github.com/llvm/llvm-project/pull/83026