[cxx-mem-model] disallow load data races (1 of some)

[Jeff Law]

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On 03/25/11 09:20, Michael Matz wrote:

> Even if there was such (IMO useless) hardware, or somebody would waste his 
> time in writing such (equally useless) virtual machine that can detect 
> fabricated problems somebody invented for some standard that never are 
> going to be problems in the real world, we shouldn't feel obliged to 
> uglify GCC for that.
> 
> (OTOH my opinion about the new c++ memory model is known ;) )
I'm not going to chime in on this specific problem; however, it is worth
noting that many of the issues raised by the C++0x memory model also
affect the linux kernel.

In fact, it was the realization that the kernel guys are fighting
closely related issues with data races that bumped the priority of the
memory model work to a level that we (Red Hat) felt it was necessary to
start pushing these issues upstream now.

jeff
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