Code review request 7132889: Possible race conditions in AbstractSelectableChannel

[Alan Bateman]

I've put a webrev with what I hope is the final patch for this:

http://cr.openjdk.java.net/~alanb/7132889/webrev/

This is your patch with tabs removed and the aligned fixed. I've also 
added a test as it is turns out to be easy to create the scenario where 
you get a valid SelectionKey even though the channel is now closed. If 
you are happy with this then I will push it today, attributing you in 
the Contributed-by of course.

-Alan