RFR: 8262454: Handshake timeout improvements, single target, kill unfinished thread [v3]

[Daniel D.Daugherty]

On Tue, 9 Mar 2021 07:22:50 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> test/hotspot/jtreg/runtime/handshake/HandshakeTimeoutTest.java line 83:
>> 
>>> 81:             int i = 0;
>>> 82:             while (true) {
>>> 83:                 i++;
>> 
>> Are we relying on the fact that the timeout is small (1ms) and so at some point one of the HandshakeALotClosure operations should timeout? 
>> Otherwise you could do as in TestAbortVMOnSafepointTimeout.java and use "wb.waitUnsafe(waitTime)" so that it will timeout right away.
>
> Yes, good, thanks, I'll do that! (funny I think I added waitUnsafe but didn't remember that :) )

Also, since the counter `i` isn't used for anything the compiler might optimize that code away...

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PR: https://git.openjdk.java.net/jdk/pull/2743