[cfe-dev] RFC: __atomic_* support for gcc 4.7 compatibility
hhinnant at apple.com
Wed Apr 11 06:27:51 PDT 2012
On Apr 11, 2012, at 5:48 AM, David Chisnall wrote:
> On 10 Apr 2012, at 23:20, Howard Hinnant wrote:
>> Of course. I'd much rather you be awake when you do this. :-)
> I thought you might...
>>> __atomic_init() is still required for atomic_init() (in both C11 and C++11) - these are currently using __atomic_store, in libc++, so I'll fix them at the same time.
>> template <class _Tp>
>> inline _LIBCPP_INLINE_VISIBILITY
>> atomic_init(atomic<_Tp>* __o, _Tp __d)
>> __o->__a_ = __d;
>> Not right?
> No, because assignments to _Atomic() variables with = are atomic, with sequentially consistent semantics. This is more or less the opposite of what we want.
I see. Thanks for the explanation.
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