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SubjectRe: [PATCH] Lightweight userspace semaphores...
> Exactly.  SMP gives you coherent memory and test-and-set or some other
> atomic operation. Why not use it?

Coherent memory on some platforms, locks on some platforms. Fortunately both
on several important architectures. It needs a much cleaner API but in
user space to wrap the user mode/kernel mode mixed locks. You need the
kernel side for sleeping cases
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