Code Review 7107516: LinkedBlockingQueue/Deque.drainTo(Collection, int) returns 'maxElements' if its value is negative

[Chris Hegarty]

According to the specification for BlockingQueue.drainTo(Collection c, 
int maxElements), this method should return "the number of elements 
transferred". However the implementation of this method for 
LinkedBlockingQueue and LinkedBlockingDeque when given a negative number 
returns the given negative number.

Invoking drainTo(Collection, int) with a value of 0 or less should 
simply return 0.

This change has been pulled from Doug Lea's CVS and I have already 
reviewed it. Sending to the list for further scrutiny/review.

Webrev:
   http://cr.openjdk.java.net/~chegar/7107516/webrev.00/webrev/

Thanks,
-Chris.