Transition to C11 atomics and memory model

[Torvald Riegel]

On Tue, 2014-09-16 at 22:02 +0000, Joseph S. Myers wrote:
> On Tue, 16 Sep 2014, Torvald Riegel wrote:
> 
> > * mips use of __sync_lock_test_and_set for both _acq and _rel is
> > surprising.  Is this __sync builtin different on mips, or is the _rel
> > variant broken and needs a stronger barrier?
> 
> It sounds like a bug - specific to the case of (MIPS16, GCC before 4.7), 
> as that's the only case where __sync_* get used on MIPS, and that case may 
> not be widely used.  Please file in Bugzilla.  (__sync_* for MIPS16 then 
> in turn ends up using out-of-line libgcc functions that call __sync_* 
> built as non-MIPS16 code, but I see nothing special there to give a 
> stronger barrier.)
> 

https://sourceware.org/bugzilla/show_bug.cgi?id=17404