RFR(XXS) 8217794: Improve termination detection in owstTaskTerminator

[Thomas Schatzl]

Hi,

On Mon, 2019-01-28 at 09:56 -0500, zgu at redhat.com wrote:
> Hi,
> 
> Could I get review for this small enhancement, that may improve
> termination dectection?
> 
> This is *not* a correctness issue, but latency improvement. Since it
> already holds lock, it is worth a quick check for termination
> condition.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8217794
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8217794/webrev.00/
> 
> Test:
>   hotspot_gc on Linux x64 (fastdebug and release)
>   Submit tests

  looks good.

Fyi (for other reviewers) I tested (and reviewed) this change already
as part of some early version of JDK-8215047.

Thanks,
  Thomas