On Thu, Dec 04, 2014 at 09:45:46PM +0000, One Thousand Gnomes wrote:
> > anywhere in that translation unit. After all, any non-static function
> > in that translation unit might be called from some other translation
> > unit that -did- use locking or whatever.
> >
> > I will let you know how it goes. ;-)
>
> It breaks DEC10 ;-)
To say nothing of CDC 6600 systems lacking the compare-move unit. ;-)
> If there is kickback over things like optimisation perhaps the gcc
> maintainers could at least consider something like
>
> int __attribute((threadsafe)) fred;
>
> ??
Not needed for recent gcc versions -- both the C11 and C++11 standards
require that different threads be permitted to independently access
different variables, where "different" means "no bits of the two variables
residing in the same byte". From what I can see, this would mean that
a conforming pre-EV56 Alpha C11 compiler would need to use LDL_L and
STL_C to carry out 8-bit and 16-bit stores. ;-)
Thanx, Paul
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