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Reports the double-checked locking construct. For a
discussion of double-checked locking and why it is unsafe, see
<a href = "http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
">http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html</a>
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Use the checkbox below to ignore double-checked locking on volatile fields. Using
a volatile field for double-checked locking works correctly on virtual machines which
implement the new Java Memory Model.
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