RFR (XS): CR 8004330: Add missing Unsafe entry points for addAndGet() family

[Aleksey Shipilev]

(I should have CC'ed Doug on this, doing now).

-Aleksey.

On 12/04/2012 02:36 AM, Aleksey Shipilev wrote:
> (again, submitting on behalf of Doug Lea)
> 
> Hi,
> 
> This simple change is missing from recently committed CR 7023898. While
> the VM support is there in Hotspot, no methods are exposed in Unsafe to
> actually make use of those intrinsics. This is the webrev fixing that:
>   http://shipilev.net/pub/jdk/hotspot/unsafe-getandadd/webrev-1/
> 
> Testing:
>   - Built and tested in Linux x86_64
>   - Doug had provided the AtomicIntegerV8 [1] version making use of this
> new code, extensively tested on his platforms
>   - java-concurrency-torture [2] atomicity tests [3] are passed for
> AtomicIntegerV8 on my and Doug's platforms
>   - no other testing is expected for this trivial change.
> 
> I would need a sponsor to push this change.
> 
> Thanks,
> Aleksey.
> 
> [1]
> https://github.com/shipilev/java-concurrency-torture/blob/master/src/main/java/java/util/concurrent/atomic/AtomicIntegerV8.java
> [2] https://github.com/shipilev/java-concurrency-torture/
> [3]
> https://github.com/shipilev/java-concurrency-torture/blob/master/src/main/java/org/openjdk/concurrent/torture/tests/atomics/integer/AtomicIntegerV8PairwiseTests.java
>