[TUHS] Reading UNIX V6: Does eash process has its own user structure, or all the processes share one copy of it?

[jigsaw]

hi Hellwig,

Thank you. Now the first 2 questions are cleared.

I guess the answer to 3rd question is buried in m40.s.....I will check it out.

Thanks again.

Regards,

Qinglai

On 10/3/06, Hellwig Geisse <Hellwig.Geisse at mni.fh-giessen.de> wrote:
> On Tue, 2006-10-03 at 12:05 +0300, jigsaw wrote:
> > First, I doubt whether all processes share one "u" or each process has
> > its own "u".
>
> Every process has its own u-area.
> They have all at the same virtual kernel address,
> but live in different physical locations.
>
> > So isn't it saying that there's only one "u" in the core memory?
>
> No. The running process' u-area is mapped into
> the virtual address space before executing any
> instructions of the process.
>
> Hellwig
>
>