On Tuesday 28 March 2006 15:28, John Baldwin wrote: > On Tuesday 28 March 2006 15:04, Daniel Eischen wrote: > > On Tue, 28 Mar 2006, Dag-Erling [iso-8859-1] Smørgrav wrote: > > > > > John Baldwin <[EMAIL PROTECTED]> 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. > > Then please provide the C idiom for declaring a pointer to a volatile > void pointer. volatile void ** declares a pointer to a pointer to a > volatile void. This is a real issue that was causing problems with > refcounting on mbuf's on sparc64 last year due to us not properly > letting the compiler know what values were being invalidated. > > cdecl doesn't seem up to the task. And again, we already had this > discussion N months ago.
Actually, my cdecl skills are in decline. :( declare foo as pointer to volatile pointer to void void * volatile *foo The different placement of volatile broken sparc64 though. However, an MI wrapper would work around that issue. I can pursue a patch that adds the wrapper unless one of you two wants to do it. I really wish you'd have spoken up earlier though. This was changed back in July. -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"