RFR(s): 8191859: SoftReference clock/timestamp should be declared volatile

[Thomas Schatzl]

Hi,

On Fri, 2017-11-24 at 14:13 +0100, Per Liden wrote:
> The clock and timestamp fields in SoftReference should be declared 
> volatile. These fields are read or updated by the VM, (possibly) 
> concurrently with the execution of Java threads.
> 
> To be more specific, the timestamp field is read by the GC during 
> reference discovery, e.g. during G1/CMS concurrent mark. The clock
> is updated by the GC, typically after reference processing has
> completed.
> 
> Webrev: http://cr.openjdk.java.net/~pliden/8191859/webrev.0/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8191859
> 

  looks good to me.

Thomas