RFR (S): 8188919: Generalize GC thread suspend/resume at safepoints

[Roman Kennke]

Am 09.10.2017 um 17:35 schrieb Erik Österlund:
> Hi,
>
> When we synchronize/unsynchronize safepoints, we make sure to perform 
> corresponding suspend/resume calls to GC-specific concurrent workers 
> that may interfere with the safepoint. This is currently done by 
> dumping GC-specific callbacks right in SafepointSynchronize::begin() 
> and SafepointSynchronize::end(). The purpose with this cleanup is to 
> hide this behind a general interface on CollectedHeap instead.
>
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8188919/webrev.00/
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8188919
>
> Thanks,
> /Erik

I like it.

It's going to conflict with this almost-pushed changeset though:

https://bugs.openjdk.java.net/browse/JDK-8179387

In fact, I think it's be cleaner to base your patch on this one.

Roman