[RFC] locking.9

[Pawel Jakub Dawidek]

On Wed, Mar 14, 2007 at 05:29:26AM +0100, Pawel Jakub Dawidek wrote:
> On Tue, Mar 13, 2007 at 08:54:10PM -0700, Julian Elischer wrote:
> > Julian Elischer wrote:
> > 
> > >ok so how about I commit this to get us started and the nroff and
> > >locking experts can take it from there.
> > 
> > The first table I think may look like this (from quick reading.. but I may be wrong):
> > 
> > 
> >     The following table shows what you can and can not do if you hold one of
> >     the synchronisation primatives discussed here: (someone who knows what
> >     they are talking about should write this table)
> 
> I think it should be:
> 
> >           You have:  You want: Spin_mtx  Slp_mtx sx_lock rw_lock sleep
> >           SPIN mutex           ok        no      no      no      no-3
> >           Sleep mutex          ok        ok-1    no      ok      no-3
> >           sx_lock              ok        no      ??      no      ok-4
>             sx_lock              ok        ok      ok-2    ok      ok
> >           rw_lock              ok        no      no      ok-2    no-3
>             rw_lock              ok        ok      no      ok-2    no

I'd also add:

              You're in: You want: Spin_mtx  Slp_mtx sx_lock rw_lock sleep
              interrupt\                 ok       no      no      no    no
              context

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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