RFR 8206424: Use locking for cleaning ProtectionDomainTable

[Ioi Lam]

Hi Patricio,

I think the test should be under a different directory since it is not specific to AppCDS

Thanks
Ioi

> On Aug 21, 2018, at 11:47 AM, Patricio Chilano <patricio.chilano.mateo at oracle.com> wrote:
> 
> Hi all,
> Could you review this fix that moves the cleanup of dead entries in the protection domain table from the VMThread to the ServiceThread.
> The goal is the same as JDK-8206423. The task of cleaning up dead entries in the protection domain table was moved to the ServiceThread.
> The fix was tested with Mach5 on tiers 1, 2, 3 on all platforms. A new test (test/hotspot/jtreg/runtime/appcds/CleanProtectionDomain.java) was added to test the creation and removal of entries in the Protection Domain table.
> Bug URL: https://bugs.openjdk.java.net/browse/JDK-820642 <https://bugs.openjdk.java.net/browse/JDK-8206423>4
> Webrev URL: http://cr.openjdk.java.net/~pchilanomate/8206424.01/webrev/index.html
> Thanks,
> Patricio
>