RFR: 8257831: Suspend with handshakes [v3]

[Robbin Ehn]

On Wed, 31 Mar 2021 06:41:20 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
>> 
>>  - Merge branch 'master' into SuspendInHandshake
>>  - Merge branch 'master' into SuspendInHandshake
>>  - 8257831: Suspend with handshake (review baseline)
>
> src/hotspot/share/runtime/thread.cpp line 2102:
> 
>> 2100:   do {
>> 2101:     set_thread_state(_thread_blocked);
>> 2102:     // Check if _external_suspend was set in the previous loop iteration.
> 
> Note that the comment for this method at line 1806 needs updating as it refers to a now deleted method.

I removed that line, not sure if the comment needs additional fixing.

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PR: https://git.openjdk.java.net/jdk/pull/3191