RFR: 8257831: Suspend with handshakes [v3]

[Robbin Ehn]

On Wed, 31 Mar 2021 09:37:37 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> src/hotspot/share/runtime/thread.cpp line 2105:
>> 
>>> 2103:     if (is_external_suspend()) {
>>> 2104:       java_suspend_self();
>>> 2105:     }
>> 
>> It is not at all clear to me how this method should interact with thread suspension ??
>
> In JavaThread::wait_for_object_deoptimization() the current thread can transition to the safe state _thread_blocked. In that state it can be suspended. In the baseline version wait_for_object_deoptimization() checks for suspension explicitly and self suspends if positive. With this enhancement it happens implicitly by calling SafepointMechanism::process_if_requested().

Yes, thanks.

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