RFR 8171971: Fix timing bug in JVM management of package export lists

[David Holmes]

Hi Harold,

Not a review but noticed the copyright updates are not correct - should 
now be "2016, 2017," for most of the files not just "2017,"

Thanks,
David

On 19/01/2017 1:05 AM, harold seigel wrote:
> Hi,
>
> Please review this fix for the package export timing holes discussed in
> JDK-8171971.  The fix reduces the number of PackageEntry fields that are
> used to maintain a package's export state and uses the Module_lock to
> protect all access to these fields.
>
> Also, in cases where a package transitions from having qualified exports
> to being unqualifiedly exported, it fixes the cleanup of its qualified
> export list by removing the _exported_pending_delete field and using
> just is_unqual_exported() to determine when the qualified exports list
> can be purged (at a safepoint).
>
> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8171971/webrev/
>
> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8171971
>
> The fix was tested with the hotspot, java/lang, java/util, java/io, JFR,
> and other JTReg tests, the JCK lang and VM tests, RBT tier2 - tier5
> tests on LinuxX64, and the colocated and non-colocated NSK tests.
>
> Thanks, Harold
>