__sync_lock_test_and_set on ARM

[Phil Endecott]

Andrew Haley wrote:
> David Daney writes:
>  > There is nothing that says that __sync_compar_and_swap() cannot expand 
>  > to a libcall.
>
> Err, if a port doen't have an implementation, that's what gcc does
> anyway.  :-)

That's what the docs say, but actually if you try to use __sync_* on 
ARM you'll get a linker error.  A library implementation would need to 
be OS-specific.


Phil.