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Q: Lock-free thread-safe Fibonacci number generator Here is my implementation of a lock-free thread-safe Fibonacci number generator. Is it correct? The idea is to use an immutable holder for previous and current numbers (since it's hard to change two values atomically at the same time) and AtomicReference which points to the current Fibonacci number. Lock-free public class FibonacciSequence { private static class FibonacciNumber { protected final BigInteger prev; protected final BigInteger curr; public FibonacciNumber(BigInteger prev, BigInteger curr) { this.prev = prev; this.curr = curr; } public FibonacciNumber next() { return new FibonacciNumber(curr, prev.add(curr)); } public BigInteger value() { return curr; } } private static final class FirstFibonacciNumber extends FibonacciNumber { public FirstFibonacciNumber() { super(null, BigInteger.valueOf(0L)); } public FibonacciNumber next() { return new FibonacciNumber(curr, BigInteger.valueOf(1L)); } } private final AtomicReference<FibonacciNumber> currentFibNumberRef; public FibonacciSequence() { currentFibNumberRef = new AtomicReference<>(new FirstFibonacciNumber()); } public BigInteger next() { while (true) { FibonacciNumber currFibNumber = currentFibNumberRef.get(); if (currentFibNumberRef.compareAndSet(currFibNumber, currFibNumber.next())) return currFibNumber.value(); } } Testing public static void main(String[] args) { testFibonacciNumberCorrectness(); // todo add thread-safe test } private static void testFibonacciNumberCorrectness() { int[] some = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811}; FibonacciNumber currFibNumber = new FirstFibonacciNumber(); for (int num : some) { assert num == currFibNumber.value().intValue(); currFibNumber = currFibNumber.next(); } } } A: I have taken this problem on as a little study in to lock efficiency, performance, and contention. As a result, I am posting a second answer with some additional information, and a different sort of review. Note: The full console output from my harness is here in pastebin.com First, my conclusion is that lock-free fib generator is a mistake. Reentrant locks are also a problem, and that the best performance comes from plain old synchronization. So, to test this all, I created a basic interface: package fibgen; import java.math.BigInteger; public interface FibGen extends AutoCloseable { /** * Get the next Fibonacci number in this sequence * @return the next number */ public BigInteger next(); /** * How many retries were needed in spin loops. * @return the retry count */ public long retryCount(); /** * because there may need to be some clean up in some generators. */ public void close(); } Right, that's a tool to generate Fibonacci numbers in a way that is independent of the implementation. Now, putting your original question code in to that framework, so you can see what I did using a familiar starting point, I got: package fibgen; import java.math.BigInteger; import java.util.concurrent.atomic.AtomicLong; import java.util.concurrent.atomic.AtomicReference; public class FibonacciSequence implements FibGen { @Override public void close() { // nothing } private static class FibonacciNumber { protected final BigInteger prev; protected final BigInteger curr; public FibonacciNumber(BigInteger prev, BigInteger curr) { this.prev = prev; this.curr = curr; } public FibonacciNumber next() { return new FibonacciNumber(curr, prev.add(curr)); } public BigInteger value() { return curr; } } private static final class FirstFibonacciNumber extends FibonacciNumber { public FirstFibonacciNumber() { super(null,