RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v9]

[David Holmes]

On Fri, 25 Oct 2024 18:42:29 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> src/hotspot/share/runtime/objectMonitor.hpp line 349:
>> 
>>> 347:   ObjectWaiter* first_waiter()                                         { return _WaitSet; }
>>> 348:   ObjectWaiter* next_waiter(ObjectWaiter* o)                           { return o->_next; }
>>> 349:   JavaThread* thread_of_waiter(ObjectWaiter* o)                        { return o->_thread; }
>> 
>> This no longer looks correct if the waiter is a vthread. ??
>
> It is, we still increment _waiters for the vthread case.

Sorry the target of my comment was not clear.  `thread_of_waiter` looks suspicious - will JVMTI find the vthread from the JavaThread?

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1818236368