RFR: 8308400: add ForceEarlyReturn support for virtual threads [v2]

[Alan Bateman]

On Sat, 20 May 2023 00:21:04 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> This enhancement adds ForceEarlyReturnXXX support for virtual threads. The spec defines minimal support that the JVMTI ForceEarlyReturnXXX can be used for a virtual thread suspended an an event.
>> Actually, the ForceEarlyReturnXXX can supports suspended and mounted virtual threads.
>> 
>> CSR (approved): https://bugs.openjdk.org/browse/JDK-8308401 add ForceEarlyReturn support for virtual threads
>> 
>> Testing:
>> New test was developed: serviceability/vthread/ForceEarlyReturnTest.
>> Submitted mach5 tiers 1-6 are good.
>> TBD: rerun mach5 tiers 1-6 at the end of review again if necessary.
>
> Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   minor tweak in libForceEarlyReturnTest.cpp

Spec + impl changes looks okay. I did not review the test at this time.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14067#pullrequestreview-1435418858