On 25 May 2011 04:45, Nicolas Pitre <nicolas.pi...@linaro.org> wrote: > FWIW, here's what the kernel part might look like, i.e. for > compatibility with pre ARMv6k systems (beware, only compile tested):
OK, so that makes a eglibc part for that pretty easy. For things like fetch_and_add (which I can see membase needs) would you expect implementation using this cmpxchg so it has a fall back or just to use ldrexd directly which I assume would be somewhat more efficient. (Question holds for both eglibc and gcc's __sync_*) > + * Notes: > + * > + * - This routine already includes memory barriers as needed. Hmm I wonder whether something like the atomic add primitives from user space need that or not; it depends whether people are using them to build larger data structures or just trying to keep a consistent count somewhere. Dave _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
