RFR (XXS) CR 8006997: ContendedPaddingWidth should be uintx

[Aleksey Shipilev]

On 02/07/2013 12:55 PM, David Holmes wrote:
> On 7/02/2013 5:52 PM, Aleksey Shipilev wrote:
>> On 02/07/2013 03:43 AM, David Holmes wrote:
>>> I have to wonder whether leaving ContendedPaddingWidth as signed is not
>>> the simplest thing to do as it may be impractical, if not impossible, to
>>> get uniformity of the signed-ness of expressions across all platforms.
>>
>> Well, Vladimir I. suggested we booby-trap against negative values with
>> guarantee(...). Will that be sufficient?
> 
> Sure - a number of flags get range checked.

Ok then. This is the new webrev:
 http://cr.openjdk.java.net/~shade/8006997/webrev.01/

I haven't found another good place to stick the guarantee() to, so opted
to stick it before the actual use. I would be happy to stick it
somewhere else where the options are generally checked, but found no
non-platform/non-OS specific location.

Testing:
  - Ad-hoc: fastdebug/release builds with negative value
  - JPRT: full-cycle HotSpot testing

-Aleksey.