You are misreading this. a) it implicitly refers to a single architecture and b) it doesn't say that single-word accesses are atomic, it says that multi-word accesses are inherently non-atomic. Making it a single-word access is necessary but not sufficient, to actually get atomic reads/writes you need to use sync/atomic <https://godoc.org/sync/atomic> (and I don't understand why questions about which accesses are atomic keep coming up on golang-nuts and /r/golang and the like, when there exists a method that *gives* you atomic accesses in the best way possible for any given architecture).
On Wed, Jul 6, 2016 at 5:32 PM, T L <tapir....@gmail.com> wrote: > http://research.swtch.com/gorace > > >> ... >> > The race is fundamentally caused by being able to observe partial updates >> to Go's multiword values (slices, interfaces, and strings): the updates are >> not atomic. >> >> The fix is to make the updates atomic. In Go, the easiest way to do that >> is to make the representation a single pointer that points at an immutable >> structure. When the value needs to be updated, you allocate a new >> structure, fill it in completely, and only then change the pointer to point >> at it. This makes the assignment atomic: another goroutine reading the >> pointer at the same time sees either the new data or the old data, but not >> a mix, assuming the compiler is careful to read the pointer just once and >> then access both fields using the same pointer value. >> > ... >> > > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
