On Nov 12, 2010, at 9:24 AM, David Young wrote: > On Thu, Nov 11, 2010 at 05:22:03PM +0100, Johnny Billquist wrote: > *snip snip* >> All others rely on the __HAVE_SIMPLE_MUTEXES >> implementation, which utilize a CAS function. Obviously the VAX does >> not have a CAS, and it is rather costly to simulate it, so I'm >> working on getting away from this. (Does really all other platforms >> have a CAS?) > > Later in this thread you mention an MP-safe VAX instruction for > manipulating linked-lists. You cannot use that instruction in a clever > way to provide atomic_cas_ptr() and atomic_swap_ptr() for rwlock(9) to > use?
Nope.
