>From the "better late than never" files:
> > I don't think there is a list anwhere (feel free to post one :-),
> > but when in doubt, you can run the "volatile spec compiance tests"
> > that Bill has at http://www.cs.umd.edu/~pugh/java/memoryModel/
> > Direct link:
> > http://www.cs.umd.edu/~pugh/java/memoryModel/Volatiles.tar
>
> You might want to change the AtomicLong test a bit. HotSpot 1.4.2
> passes the test with the original code but with this change
>
> --- AtomicLong.java.orig 2004-01-06 20:05:14.000000000 +0100
> +++ AtomicLong.java 2004-01-06 20:05:01.000000000 +0100
> @@ -33,6 +33,9 @@
> public class AtomicLong extends Thread {
> static int w;
> static volatile long v;
> +
> + static Object o;
> +
> static int count = 10000000;
>
> long key;
>
> I see some violations (at least on x86 and AMD64).
>
This seems to occur because the long isn't aligned to a 64-bit boundary.
We don't have a foolproof way of reproducing this, but we changed the test
so it works on 2 long volatiles, with a 32 bit int declared between them.
You can look at the new one at the address quoted above.
Worth checking into, for any VM writers out there.
Jeremy
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