RFR: JDK-8199620: Support for JNI object pinning

[Thomas Schatzl]

Hi,

On Mon, 2018-03-19 at 18:07 +0100, Roman Kennke wrote:
> Hi Erik,
> 
> thanks for reviewing!
> 
> I can do that, but a GC would get the opportunity to do both, or one
> or the other in any case. As it stands, the JNI side of the GCLocker
> protocol is always executed. If a GC decides to participate in
> GCLocker protocol, by calling GCLocker::check_active_before_gc() and
> related API, then will get JNI Critical function support, otherwise
> GCLocker is basically counting up and down counters.
> 
> If it instead wishes to use pinning and ignore JNI critical
> functions, then it only needs to override the pinning methods and not
> participate in GCLocker, and everything would be fine.
> 
> However, I don't mind either way, so here's the alternative:
> Diff:
> http://cr.openjdk.java.net/~rkennke/8199620/webrev.02.diff/
> Full:
> http://cr.openjdk.java.net/~rkennke/8199620/webrev.02/
> 
> Better?

  I also prefer this version. Looks good.

Thanks,
  Thomas