RFR (S): 8165859: gcTaskThread is missing volatile qualifier and barriers for _time_stamps

[Kim Barrett]

> On Sep 19, 2016, at 7:35 AM, Erik Österlund <erik.osterlund at oracle.com> 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-8165859
> Webrev: http://cr.openjdk.java.net/~eosterlund/8165859/webrev.00/
> 
> This specific CR handles the lack of volatile qualifiers for the _time_stamps field, and relatedly the lack of acquire barriers when accessing it.
> Hopefully, the addition of load acquire and volatile should make this a bit more robust.
> 
> Testing: JPRT
> 
> I will need a sponsor to push this.
> 
> Thanks,
> /Erik

Looks good.