RFR for JDK-6963118 Intermittent test failure: test/java/nio/channels/Selector/Wakeup.java fail intermittently (win)

srikalyan srikalyan.chandrashekar at oracle.com
Tue Dec 17 11:53:34 PST 2013

Hi all, I am working on bug JDK-6963118 
<https://bugs.openjdk.java.net/browse/JDK-6963118> .

Root Cause:
- Sensitive timing dependency between events in Main and Sleeper threads 
are causes for test failure.

Suggested Fix:
   1) Main thread should wait for more than 1sec(made it 3sec) and check 
more often than 50ms(made it 1ms) intervals , sleeper thread may be 
still waiting for interrupt/wakeup hence main thread waiting for just 
1sec to flag a failure is premature. The reason is especially on windows 
high priority virus scanners etc run(we faced it when simulating 
failures) and kept the system busy.
   2) The test is essentially a sequence of 2 events
   a)Firing up wakeups/interrupts followed by a
   - Main and sleeper thread must step in tandem(synch) which can be 
done by checking the sleeper.entries value and yielding the main thread 
as required.

The webrev is hosted at 
http://cr.openjdk.java.net/~cl/host_for_kal/6963118-Wakeup/ .
Please let me know if you have any comments or suggestions.



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