RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v7]

[Alan Bateman]

On Thu, 24 Oct 2024 02:42:35 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Patricio Chilano Mateo has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Minor fixes in inc/dec_held_monitor_count on aarch64 and riscv
>
> src/java.base/share/classes/java/lang/Thread.java line 655:
> 
>> 653:      * early startup to generate the identifier for the primordial thread. The
>> 654:      * counter is off-heap and shared with the VM to allow it assign thread
>> 655:      * identifiers to non-Java threads.
> 
> Why do non-JavaThreads need an identifier of this kind?

JFR. We haven't changed anything there, just the initial tid.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1814387940