RFR(s): 8252414: Redundant suspend check when determining if a java thread is safe

[Coleen Phillimore]

In this change, the little function account_safe_thread() is only called 
in one place now.  Should it be inlined?

The change looks good to me.

Thanks,
Coleen

On 8/27/20 3:21 AM, Robbin Ehn wrote:
> Hi all, please review.
>
> In 8221207 - "Redo JDK-8218446 - SuspendAtExit hangs" we fixed so a
> thread is always blocked when suspended.
>
> And added this nice assert.
> int JavaThread::java_suspend_self() {
>   assert(thread_state() == _thread_blocked, "wrong state for 
> java_suspend_self()");
>
> When checking if a thread is safepoint/handshake safe there no need to 
> look at ext suspend flag anymore, since the thread is blocked.
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8252414
> Code:
> http://cr.openjdk.java.net/~rehn/8252414/webrev/index.html
>
> Passes t1-5
>
> Thanks, Robbin