From: terekhov@web.de   
      
   Dave Abrahams wrote:   
   >   
   > on Mon Oct 24 2011, Alexander Terekhov  wrote:   
   >   
   > > Dave Abrahams wrote:   
   > > [...]   
   > >> Yes, basically.  There are some (expert-only) uses for "half-barriers"   
   > >> that allow movement of some operations, but mutex locks are basically   
   > >> always associated with strict, sequentially-consistent barriers.   
   > >   
   > > I always thought that C++11 mutex locks can be expressed in terms of   
   > > relaxed C++11 atomic<> operations and acquire/release fences (not the   
   > > same as memory_order_seq_cst fence).   
   >   
   > You know, you're probably right.  I guess you acquire on lock and   
   > release on unlock or something?   
      
   C++11 acquire/release fences mimic Power import/export barriers, see:   
      
   http://www.cs.ox.ac.uk/people/jade.alglave/stability/stability-long.pdf   
   ("Stability in Weak Memory Models With Proofs")   
      
   regards,   
   alexander.   
      
      
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