RFR: 8080879: Remove AbstractGangTask::set_for_termination

[Per Liden]

On 2015-05-22 16:19, Stefan Karlsson wrote:
> Hi all,
>
> AbstractGangTask::set_for_termination(uint active_workers) is a virtual
> function that sub-classes can override to run setup code before the task
> is started. The active_workers parameter tells the task how many workers
> are going to execute the task.
>
> Only a few tasks use this infrastructure and most tasks run the setup
> code in the constructor or before the task is constructed. There is no
> place where we construct a FlexibleGangTask task, change the number of
> active workers, and then start the task. The tasks are always started
> near the construction site. So, I propose that we get rid of
> AbstractGangTask::set_for_termination to shrink the AbstractGangTask API.
>
> I didn't want to change how the CMS worker threads are started, so I
> moved AbstractGangTask::set_for_termination to YieldingFlexibleGangTask.
>
> http://cr.openjdk.java.net/~stefank/8080879/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8080879

Looks good. Just one thing, could we move the reset() call out of 
ParScanThreadStateSet::ParScanThreadStateSet() and call it explicitly, 
when ParNewGenTask is used? I.e. similar to how it's done when 
ParNewRefProcTaskProxy is used.

/Per

>
> Thanks,
> StefanK