RFR: 8263427: Shenandoah: Trigger weak-LRB even when heap is stable [v3]

[Zhengyu Gu]

On Mon, 15 Mar 2021 09:27:01 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp line 1737:
>> 
>>> 1735:   // We need a rendezvous here to avoid the following race:
>>> 1736:   // 1. Java thread reads referent, sees non-null but unreachable oop
>>> 1737:   // 2. GC thread clears the referent
>> 
>> How is this possible? GC threads (workers) are not running when rendezvous roots. What do I miss?
>
> But they are running *before* rendezvous roots.

Okay, looks good.

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PR: https://git.openjdk.java.net/jdk/pull/2945