[Bug c++/46096] Code produces two different outputs when optimized respectively with -O2 and without it.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46096

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-10-20 
14:24:30 UTC ---
yes, they share the same address space, but modern processors have multilevel
caches and unless you provide suitable synchronisation the write to
alpha1->number might not get made visible to other threads

I suggest you use a mutex around shared data