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

[Ivan Gerasimov]

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>