[PATCH] Add atomic type qualifier

[Andrew MacLeod]

On 07/26/2013 03:01 PM, Andi Kleen wrote:
> Andrew MacLeod <amacleod@redhat.com> writes:
>> What it doesn't do:
>>    * It doesn't implement the C11 expression expansion into atomic
>> built-ins.  ie, you can't write:
>> _Atomic int x;
>>   x = 0;
>>        and have the result be an atomic operation calling
>> __atomic_store (&x, 0).
> How would this work if you want a different memory order?
>
>
The way the standard is defined, any implicit operation like that is 
seq_cst.  If you want something other than seq-cst, you have to 
explicitly call atomic_store (&x, 0, model).

C11 also provides all those same atomic routines that c++11 provides for 
this reason.  They just decided to try to implement the c++ atomic 
templates in the language along the way :-P  so it feels very much like 
c++ atomics...

Andrew