[dmd-concurrency] synchronized, shared, and regular methods inside the same class

[Sean Kelly]

On Jan 6, 2010, at 11:52 AM, Sean Kelly wrote:
> 
> In cases 1 and 2, all we really need to worry about is the assignment to x.  On recent x86 we should be able to use 8 byte CAS to do it in one shot, but on other architectures the algorithm seems more complicated.  I'd need to poke around to see if there's a published algorithm for updating two values together, but here's a shot at it that uses a special value assigned to the array pointer as a sentinel

I just thought of a better approach.  Simply set the '1' bit of the pointer to indicate that an update is taking place, since it really will never be set under normal circumstances.