[LLVMdev] RFC: Atomics.h

[Owen Anderson]

I meant as opposed to CAS+fence, though I have since found out I was  
incorrect.

--Owen

On May 16, 2009, at 8:49 PM, Jeffrey Yasskin wrote:

> What would you do with a just-hardware memory fence? If the compiler's
> free to move operations over the hardware fence, that seems to defeat
> the purpose.
>
> C++0X provides a compiler-only fence, and a hardware+compiler fence,
> but no hardware-only fence, I believe for this reason. See
> <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2857.pdf>,
> section 29.8.
>
> On Sat, May 16, 2009 at 7:33 PM, Owen Anderson <resistor at mac.com>  
> wrote:
>> Surprisingly enough, libatomic_ops doesn't define just a hardware  
>> memory
>> fence call as far as I can tell.
>> --Owen
>> On May 16, 2009, at 3:00 PM, Zoltan Varga wrote:
>>
>> Hi,
>>
>>   You might want to use this:
>>
>> http://www.hpl.hp.com/research/linux/atomic_ops/
>>
>>                              Zoltan
>>
>> On Sat, May 16, 2009 at 11:11 PM, Owen Anderson <resistor at mac.com>  
>> wrote:
>>>
>>> Some of you may have noticed that I addedd include/llvm/System/ 
>>> Atomics.h
>>> to the repository briefly, which will be used for adding support for
>>> threading in LLVM.
>>>
>>> I have tried to provided appropriate implementations of the atomic  
>>> ops
>>> (currently memory fence and CAS) for platforms we care about, but my
>>> knowledge of these, and my ability to test them, is limited.  So,  
>>> please, if
>>> you run on any less common platform, test out the file, and send  
>>> me patches
>>> to improve it if it doesn't work verbatim on your system.
>>>
>>> Thanks,
>>>
>>> --Owen
>>> _______________________________________________
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>>>
>>
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>
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