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SubjectRe: [PATCH] Lightweight userspace semaphores...


On Mon, 25 Feb 2002, Rusty Russell wrote:
> >
> > sys_sem_create()
> > sys_sem_destroy()
>
> There is no create and destroy (init is purely userspace). There is
> "this is a semapore: up it". This is a feature.

No, that's a bug.

You have to realize that there are architectures that need special
initialization and page allocation for semaphores: they need special flags
in the TLB for "careful access", for example (sometimes the careful access
ends up being non-cached).

You can't just put semaphores anywhere and tell the kernel to try to fix
up whatever happened.

Linus

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