Date: Tue, 6 Jun 2006 00:30:09 +0800 From: MingyanGuo <guomingyan@gmail.com> To: freebsd-arch@freebsd.org Cc: delphij@gmail.com Subject: Re: Why use `thread' as an argument of Syscalls? Message-ID: <1fa17f810606050930g407d622frd3568cf8036191b5@mail.gmail.com> In-Reply-To: <1fa17f810606050921n44da78d6y52f41279a0c1396b@mail.gmail.com> References: <1fa17f810606050044k2847e4a2i150eb934ed84006f@mail.gmail.com> <Pine.GSO.4.64.0606050744190.13542@sea.ntplx.net> <1fa17f810606050608l5bd2ec5ch37663375f6fa5b64@mail.gmail.com> <Pine.GSO.4.64.0606051118180.14745@sea.ntplx.net> <20060605163559.N50057@fledge.watson.org> <1fa17f810606050921n44da78d6y52f41279a0c1396b@mail.gmail.com>
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On 6/5/06, Robert Watson <rwatson@freebsd.org> wrote:
>
>
> On Mon, 5 Jun 2006, Daniel Eischen wrote:
>
> >> They are the same questions, I think ;-). Now would you please explain
> "why
> >> use `proc' as an argument of Syscalls" to me :)? I've read some
> source
> >> code of the kernel, but no comments about it found.
> >
> > I don't know. Convention? It makes sense to me.
>
> Certainly consistency. Most system calls do actually use the argument at
> some
> point -- be it to look up a file descriptor, access control, or the like,
> and
> the calling context has it for free and in-hand anyway.
>
> Robert N M Watson
>
Thanks for your reply. And any more reasons?
I have browsed some OpenSolaris and Linux source,
and find that they get the `proc'/`thread'/`task'
by `curproc'/`curthread'/`current' like macros
when needed, which are different from FreeBSD.
So I wanna know why FreeBSD do it in this way,
has some mysterious reasons;-)? or not.
Thanks
Regards,
MingyanGuo
--
Three passions, simple but overwhelmingly strong, have governed my life:
the longing for love, the search for knowledge, and unbearable pity for
the suffering of mankind.
---------Bertrand Russell
--
Three passions, simple but overwhelmingly strong, have governed my life:
the longing for love, the search for knowledge, and unbearable pity for
the suffering of mankind.
---------Bertrand Russell
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