[Bug libstdc++/126235] std::atomic> can stall under SCHED_FIFO on a single CPU

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126235

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
This sounds like a priority inversion bug. I am not 100% sure this is a bug in
libstc++ code either. Just a misunderstanding of priorities and how SCHED_FIFO
works.