cvs commit: src/sys/i386/include atomic.h

Daniel Eischen deischen at
Tue Mar 28 20:04:33 UTC 2006

On Tue, 28 Mar 2006, Dag-Erling [iso-8859-1] Smørgrav wrote:

> John Baldwin <jhb at> writes:
> > s/off/on/ I trust
> >
> > Not true.  The tinderbox would attest to that.  Please see code such as
> > this:  [...]
> which uses uintptr_t, not actual pointers, to avoid warnings.  In
> effect, that code is broken.
> Apply the attached patch, see how far a buildkernel gets...
> I think the proper thing to do, to cover all your bases, would be to
> define a MD atomic_*_intptr family which operated on uintptr_t, and
> define an MI atomic_*_ptr family which operates on void * based on
> that.

I would like to see that.

> > Even userland uses casts when it uses void * rather than uintptr_t for
> > the underlying type.  See src/lib/libpthread/sys/lock.c or
> > src/lib/libthr/thr_umtx.h.

I didn't like having to do that in libpthread.  It was confusing
to me.  I'd be happy if I never had to deal with uintptr_t.

> The latter only works because libthr is built with warnings disabled.
> I just finished working on making it build at WARNS level 2; higher
> levels will require a major overhaul, because the kernel interface it
> uses is fundamentally broken.


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