RFR 6720349: NotificationBufferDeadlockTest.java throw exception: java.lang.Exception: TEST FAILED: Deadlock detected

[shanliang]

Hi,

Please review this fix:

bug: https://bugs.openjdk.java.net/browse/JDK-8068418
webrev: http://cr.openjdk.java.net/~sjiang/JDK-8068418/00/

This must be a timing issue in the test, the test called:
    t.join(5000L);   
to wait a thread's dying,  I reproduced the bug by insert at line 202:
    try {
        Thread.sleep(5100);
    } catch (Exception ee) {}
to delay the t's dying.

The fix is to replace:
    t.join(5000L);
by:
    t.join();

and replace:
    Object.wait(timeout);
by
    CountDownLatch.countDown();

The test harness timeout will be used as the max waiting timeout.

Shanliang