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From book "Java Concurrency in Practice" page 26: You can use volatile variables only when all the following criteria are met: Writes to the variable do not depend on its current value, or you can ensure that only a single thread ever updates the value; The variabledoes not participate in invariants with other state variables; and Locking is not required for any other reason while the variable is being accessed. How to comprehend " The variable does not participate in invariants with other state variables when using volatile keyword "?
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