see discussion on core-libs-dev:
  http://mail.openjdk.java.net/pipermail/core-libs-dev/2011-April/006688.html

From Doug:

Here's another set of very minor javadoc updates: The lists of
non-atomic "bulk" operations were incomplete in some concurrent
collections and missing in others, as was noted in a recent ASPLOS paper
"Specifying and Checking Semantic Atomicity for Multithreaded Programs"
by Jacob Burnim, George Necula, Koushik Sen. (See
http://www.cs.berkeley.edu/~jburnim/pubs/BurnimNeculaSen-ASPLOS11.pdf).
A sample update is below. I updated jsr166 versions. I'll work
with the usual folks to create a CR and integrate. (Thanks very
much to Chris Hegarty in particular for being so helpful with these
integrations!)


diff -r1.73 ConcurrentLinkedQueue.java
46c46,53
< * of elements requires a traversal of the elements.
---
 > * of elements requires a traversal of the elements, and so may report
 > * inaccurate results if this collection is modified during traversal.
 > * Additionally, the bulk operations <tt>addAll</tt>,
 > * <tt>removeAll</tt>, <tt>retainAll</tt>, <tt>containsAll</tt>,
 > * <tt>equals</tt>, and <tt>toArray</tt> are <em>not</em> guaranteed
 > * to be performed atomically. For example, an iterator operating
 > * concurrently with an <tt>addAll</tt> operation might view only some
 > * of the added elements.