8005697: Add StampedLock - JEP 155

[Peter Levart]

On 01/28/2013 01:22 PM, Doug Lea wrote:
> On 01/28/13 07:16, Aleksey Shipilev wrote:
>> On 01/28/2013 03:32 PM, Chris Hegarty wrote:
>>> Webrev:
>>> http://cr.openjdk.java.net/~chegar/8005697/ver.00/webrev/webrev/
>>
>> The only nit I find unlucky is that we need to duplicate the TLR code in
>> LockSupport. It looks like we would be better off with the helper class
>> sharing this functionality. I would speculate Doug will contaminate more
>> classes in j.u.c.* with these TLR copy-paste patches, and so we can
>> figure this out once and for all when the dust settles.
>>
>
> Yes, exactly so. Maybe someday with module support there will
> be a nicer way of coping with package-protection problems accessing
> Thread fields. Until then, because j.u.c has two subpackages
> (atomic, locks), there's no nice workaround that I know of.
>
> -Doug
What about copying the Unsafe? A singleton instance that does access 
checks in the public factory method with usages that cache this instance 
privately in static fields...

Regards, Peter