On 02/22/2010 09:00 PM, Peng Du wrote: > I am using GCC Atomic operations, e.g. __sync_bool_compare_and_swap to > do some low level sync stuff. I have the following questions: > > 1) are these SMP-safe on x86, i.e. will the result be visible to all > CPUs after applying these functions? Yes: that's the whole idea. > 2) otherwise, does it requires some sort of memory barrier/fence to > flush the result? > 3) do I have to use "volatile" with atomic operations? Yes. Andrew.
