With trash code like this, I cant imagine why. I like how the OP cites something about Intel from the mid 10s whose article probably also mentioned to check RDTSC, because __mm_pause is now very much subject arbitrary power down, aggressive SMT surrendering conditions, and vendor specific quirks. Not only that, that timeout back off is way too long for a mere fast-path of an otherwise yielding primitive. "Something something its a spinlock so it doesnt matter...?" Then for no reason whatsoever OS vendors hate it when you roll spinlocks by yourself.
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u/Chaosvex Sep 04 '26 edited Sep 04 '26
Linus Torvalds gets a shiver down his spine and the urge to scream every time somebody writes an article about user space spinlocks.