RFR(XS) 8212074: Add method to peek the remaining tasks in task queues

[Roman Kennke]

Hi Zhengyu.

>> Hi Zhengyu,
>>
>> On Fri, 2018-10-12 at 09:28 -0400, Zhengyu Gu wrote:
>>> Hi All,
>>>
>>> Shenandoah implemented an variant of termination protocol based on
>>> [1], which requires to peek into task queues for remaining tasks, so
>>> that it can wake just enough workers to steal tasks.
>>>
>>> The patch adds methods for this purpose, and allow subclasses of
>>> ParallelTaskTerminator to access it members.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8212074
>>> Webrev: http://cr.openjdk.java.net/~zgu/8212074/webrev.00/
>>
>>    could you please move line 451 of taskqueue.hpp in the obviously
>> following patch that adds the ShenandoahTaskTerminator to the
>> Shenandoah specific code? It does not seem to fit here.
> 
> Agree.
> 
> Updated webrev: http://cr.openjdk.java.net/~zgu/8212074/webrev.01/

Looks good to me.

Thanks,
Roman


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