RFR: 8257831: Suspend with handshakes [v2]

[Robbin Ehn]

On Wed, 31 Mar 2021 03:59:35 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 two commits:
>> 
>>  - Merge branch 'master' into SuspendInHandshake
>>  - 8257831: Suspend with handshake (review baseline)
>
> src/hotspot/share/prims/jvmtiRawMonitor.cpp line 319:
> 
>> 317:     jt = self->as_Java_thread();
>> 318:     while (true) {
>> 319:       // To pause suspend requests while in native we must block handshakes.
> 
> The earlier comment says we must be _thread_blocked in this code, so we won't be "native". But that is not a _thread_blocked that is managed by a thread-state transition so that is why this code has to "manually" manage the handshake state.

Fixed comment

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