Re: [PATCH] Lightweight userspace semaphores...

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Sat Feb 23 2002 - 16:22:59 EST


> 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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