6979009: (fc) FileChannel.read() fails to throw ClosedByInterruptException

[Alan Bateman]

I've been talking to Dag Wanvik (Derby/Java DB project) about some 
issues that they are seeing when threads doing I/O with a FileChannel 
are interrupted. They periodically see the channel being "silently 
closed" and also spurious ClosedByInterruptExceptions thrown by other 
threads doing I/O that are not interrupted. As it turns out there is a 
small rat's nest that has always been there. The following changes fix 
these issues so that ClosedByInterruptException is consistently thrown, 
and only by the thread that is interrupted. We may need to follow this 
up with a spec clarification for the case that a thread is interrupted 
at just around the time that an I/O completes.

http://cr.openjdk.java.net/~alanb/6979009/webrev/

Thanks,
Alan.