Feat: Atom

the-well-grounded-java-developer/src/main/java/com/currenjin/concurrency/Atom.java

@@ -0,0 +1,25 @@
+package com.currenjin.concurrency;
+
+public class Atom {
+	private volatile int value;
+
+	public Atom(int value) {
+		this.value = value;
+	}
+
+	public final int incrementAndGet() {
+		while(true) {
+			int current = value;
+			int next = current + 1;
+			if (compareAndSet(current, next)) {
+				return next;
+			}
+		}
+	}
+
+	private boolean compareAndSet(int expected, int newValue) {
+		return true;
+		// CPU 명령
+		// return unsafe.compareAndSwapInt(this, valueOffset, expected, newValue);
+	}
+}