On Wed, 29 Nov 2023 22:22:09 GMT, Serguei Spitsyn <sspit...@openjdk.org> wrote:
> There is a check for virtual thread liveness which has to be good enough in
> general:
>
> ```
> 1617 static bool should_dump_vthread(oop vt) {
> 1618 return java_lang_VirtualThread::state(vt) !=
> java_lang_VirtualThread::NEW
> 1619 && java_lang_VirtualThread::state(vt) !=
> java_lang_VirtualThread::TERMINATED;
> 1620 }
> . . .
> 1919 if (java_lang_VirtualThread::is_instance(o) &&
> ThreadDumper::should_dump_vthread(o)) {
> 1920 _vthread_dumper->dump_vthread(o, writer());
> 1921 }
> ```
That should in general take care of most unreachable virtual threads, but
technically I don't think a virtual thread has to reach the TERMINATED state in
order to become unreachable. However, it will never get scheduled.
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PR Comment: https://git.openjdk.org/jdk/pull/16665#issuecomment-1833132940
