GCC interpretation of C11 atomics (DR 459)

[Florian Weimer]

On 02/27/2018 05:40 PM, Simon Wright wrote:
> Sorry to butt in, but - if it's ROM why would you need atomic load anyway? (of course, if it's just a constant view of the object, reason is obvious)

On many systems, the read-only nature of a memory region is a 
thread-local or process-local attribute.  Other parts of the system 
might have a different view on the same memory region.

Some CPUs support memory protection keys, which provide a cheap way to 
switch memory from read-only to read-write and back, and those switching 
operations deliberately do not involve a memory barrier.

Thanks,
Florian