On Tue, 2014-06-17 at 08:20 +0200, Jürg Billeter wrote: > On Tue, 2014-06-17 at 01:38 +0200, Maciej Piechotka wrote: > > On Mon, 2014-06-16 at 10:55 +0800, Nor Jaidi Tuah wrote: > > > Summary: byte access (read/write) is atomic on > > > MOST architectures. Dang! I thought ALL. > > > > > > > I'm not sure but there is no guarantee that it is - you don't know it it > > will be, say, in ARMv9. Alpha, while probably not in the top 3 most > > popular ISA on the world, is a strange architecture. > > I'm not aware of any modern CPU where aligned loads or stores (up to > machine word size) are not atomic. While Alpha has no ordering > guarantees, aligned loads and stores are still atomic, as far as I know. > I don't see this changing in the foreseeable future for general purpose > CPUs. You still have to be very careful about reordering issues, though. > > Regards, > Jürg >
Thanks for clarification. As I wrote I wasn't 100% sure about Alpha, and I don't have one around to play with it ;) Best regards
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