RFR (S): 8165858: heapRegionManager is missing volatile qualifier for _claims

[Thomas Schatzl]

Hi Erik,

On Mon, 2016-09-19 at 13:47 +0200, Erik Österlund wrote:
> Hi,
> 
> This bug is a split out of the larger JDK-8033552 for adding
> volatile 
> qualifiers to lock-free code.
> The motivation is to make our implementation more robust since these 
> kind of issues have struck us a few times too many already.
> 
> CR: https://bugs.openjdk.java.net/browse/JDK-8165858
> Webrev: http://cr.openjdk.java.net/~eosterlund/8165858/webrev.00/
> 
> This specific CR handles the lack of volatile qualifiers for the
> _claims 
> field of the HeapRegionClaimer class in the heapRegionManager files.
> It 
> is part of a lock-free protocol for claiming reagions, and should use
> a 
> volatile qualifier to be more robust.
> 
> Testing: JPRT

  looks good to me.

Thomas