The Java™ language contains two intrinsic synchronization mechanisms: synchronized blocks (and methods) and volatile variables. Both are provided for the purpose of rendering code thread-safe. Volatile variables are the weaker (but sometimes simpler or less expensive) of the two -- but also easier to use incorrectly. In this installment of Java theory and practice, Brian Goetz explores some patterns for using volatile variables correctly and offers some warnings about the limits of its applicability.
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