RFR [7181748] TEST_BUG: java/lang/ThreadGroup/Suspend test fails intermittently

[Chris Hegarty]

I'm not sure I ever saw this test fail, but it does look like it has issues.

I would much prefer to see a j.u.c.Latch/Phaser used to synchronize 
across these threads.

-Chris.

On 10/06/2013 13:51, Ivan Gerasimov wrote:
> Hello everyone!
>
> The test of ThreadGroup.Suspend() was reported to fail on rare occasions.
> It can happen on a busy machine that 1 second delay would not be enough
> for the second thread to start.
> Then the first thread would suspend only itself and the test would fail.
> Earlier, another test was updated for similar reasons [1], [2].
>
> The proposed test can still report false *positive* results if the
> second thread has had no chance to execute during one second after it
> had started.
> To avoid them there must be a way do distinguish suspended threads.
>
> WEBREV: http://cr.openjdk.java.net/~igerasim/7181748/webrev.0/
> BUG: http://bugs.sun.com/view_bug.do?bug_id=7181748
>
>
> [1] http://bugs.sun.com/view_bug.do?bug_id=7084033
> [2] http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/184578f3e8b9
>
> Sincerely yours,
> Ivan Gerasimov
> <https://jbs.oracle.com/bugs/browse/JDK-7084033>