RFR: 8257641: Shenandoah: Query is_at_shenandoah_safepoint() from control thread should return false [v2]

[Aleksey Shipilev]

On Thu, 3 Dec 2020 15:43:16 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Since Shenandoah GC safepoints are scheduled by control thread, so that, if querying comes from control thread, the answer should be false.
>> 
>> is_at_shenandoah_safepoint() is still not reliable, even after JDK-8253778, we may consider to scratch it.
>> 
>> - [x] hotspot_gc_shenandoah x86_64 and x86_32
>
> Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update

Looks good.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1600