[libc-commits] [libc] [libc] Make 'rand()' thread-safe using atomics instead of TLS (PR #96692)

[Roland McGrath via libc-commits]

https://github.com/frobtech approved this pull request.

I agree this is a better approach for this code than `thread_local` or MT-unsafe or locks.  The only potential issue is if there are any embedded cases that are purely single-threaded and atomics are not available (or too costly). (For example, on AArch64 you can't use atomics when the MMU is off.)

https://github.com/llvm/llvm-project/pull/96692