Re: [boost] [atomic] Probable documentation issue: how do we knowatomic is safe and/or efficient?

Subject: Re: [boost] [atomic] Probable documentation issue: how do we knowatomic is safe and/or efficient?
From: Peter Dimov (lists_at_[hidden])
Date: 2013-12-24 09:29:55

John Maddock wrote:
> I'm sure the answer to (a) is that it is correct, but I was surprised that 
> atomic<int> relied on the volatile modifier for thread safe load/stores on 
> MSVC, I had assumed that something more than that would have been 
> required, but I know I'm out of date on this stuff!

"volatile" was changed in VC++ 8.0 to guarantee acquire/release semantics, 
then changed back in 2012 to only do so when /volatile:ms is active, which 
it is by default, except on ARM.

http://msdn.microsoft.com/en-us/library/12a04hfd.aspx