RFR: 8263832: Shenandoah: Fixing parallel thread iteration in final mark task

[Zhengyu Gu]

On Thu, 18 Mar 2021 20:13:32 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> It's not trivial. Maybe I'm missing something, but where are the threads claimed now? I believe you should leave the claiming code where it is, right? And only change threads_do() to possibly_parallel_threads_do().

Threads are claimed inside Threads::possibly_parallel_threads_do() (https://github.com/openjdk/jdk/blob/master/src/hotspot/share/runtime/thread.cpp#L2866)

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PR: https://git.openjdk.java.net/jdk/pull/3080