RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning

[Patricio Chilano Mateo]

On Thu, 31 Oct 2024 02:26:42 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> src/hotspot/share/runtime/objectMonitor.inline.hpp line 207:
>> 
>>> 205: }
>>> 206: 
>>> 207: inline bool ObjectMonitor::has_successor() {
>> 
>> Why are _succ accesses atomic here when previously they were not?
>
> General convention is that racily accessed variables should be accessed via Atomic::load/store to make it clear(er) they are racy accesses. But I agree it seems odd when direct accesses to `_succ` in the main cpp file are not atomic.

> Why are _succ accesses atomic here when previously they were not?
>
They should had always been atomic.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1824794270