RFR (M): 8215297: Remove ParallelTaskTerminator

[Zhengyu Gu]

Hi Thomas,

Shared changes look good to me.

I filed follow-up CR(JDK-8238162) to remove ShenandoahTaskTerminator 
wrapper.

Thanks,

-Zhengyu

On 1/29/20 8:04 AM, Thomas Schatzl wrote:
> Hi all,
> 
>    can I have reviews for this change that removes the 
> ParallelTaskTerminator code? In JDK12 we introduced another 
> implementation, the OWSTTaskTerminator, that seems to work just fine as 
> default for more than a year now, so I think it is time to remove the 
> old implementation.
> 
> @Shenandoah-Team: I left the ShenandoahTaskTerminator wrapper, but 
> removing the TaskTerminator wrapper for the other GCs. I can remove that 
> too, but did not know if you wanted to keep the name.
> 
> In a follow-up change I would like to change the name of the 
> OWSTTaskTerminator to just TaskTerminator (also renaming the files, but 
> keeping it separate to taskqueue.?pp). Tell me if there are any concerns.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8215297
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8215297/webrev/
> Testing:
> hs-tier1-5, builds with Shenandoah
> 
> Thanks,
>    Thomas
>