D2 CAS, atomic increment

[Don]

Jason House wrote:
> I'm currently using part of the Tango D2 branch to get basic lock free methods. I know there's license issues with just copying Tango into Phobos, so does anyone have (or be able to write) these basic building blocks?
There are no license issues with using anything written by Sean (or me).

> 
> I'm planning on porting the lock-free (and mostly fence free) hash table from "high-scale-lib". It beats the pants off Java's concurrent hash table and scales nearly linear to hundreds of cores and thousands of threads. It can also handle a high write rate. I'll try to get it into Phobos when done.