--- jsr166/src/test/tck/AtomicReferenceFieldUpdaterTest.java	2003/09/20 18:20:07	1.3
+++ jsr166/src/test/tck/AtomicReferenceFieldUpdaterTest.java	2017/09/20 00:59:17	1.37
@@ -1,118 +1,194 @@
 /*
- * Written by members of JCP JSR-166 Expert Group and released to the
- * public domain. Use, modify, and redistribute this code in any way
- * without acknowledgement. Other contributors include Andrew Wright,
- * Jeffrey Hayes, Pat Fischer, Mike Judd.
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ * Other contributors include Andrew Wright, Jeffrey Hayes,
+ * Pat Fisher, Mike Judd.
  */
 
-import java.util.concurrent.atomic.*;
-import junit.framework.*;
-import java.util.*;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
 
-public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
+import junit.framework.Test;
+import junit.framework.TestSuite;
+
+public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
     volatile Integer x = null;
+    protected volatile Integer protectedField;
+    private volatile Integer privateField;
     Object z;
     Integer w;
+    volatile int i;
 
-    public static void main(String[] args){
-        junit.textui.TestRunner.run(suite());
+    public static void main(String[] args) {
+        main(suite(), args);
     }
-
-   
     public static Test suite() {
         return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
     }
 
+    static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
+        return AtomicReferenceFieldUpdater.newUpdater
+            (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
+    }
+
     /**
-     *
+     * Construction with non-existent field throws RuntimeException
      */
-    public void testConstructor(){
-        try{
-            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
-                a = AtomicReferenceFieldUpdater.newUpdater
-                (getClass(), Integer.class, "y");
+    public void testConstructor() {
+        try {
+            updaterFor("y");
             shouldThrow();
+        } catch (RuntimeException success) {
+            assertNotNull(success.getCause());
         }
-        catch (RuntimeException rt) {}
     }
 
+    /**
+     * construction with field not of given type throws ClassCastException
+     */
+    public void testConstructor2() {
+        try {
+            updaterFor("z");
+            shouldThrow();
+        } catch (ClassCastException success) {}
+    }
 
     /**
-     *
+     * Constructor with non-volatile field throws IllegalArgumentException
      */
-    public void testConstructor2(){
-        try{
-            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
-                a = AtomicReferenceFieldUpdater.newUpdater
-                (getClass(), Integer.class, "z");
+    public void testConstructor3() {
+        try {
+            updaterFor("w");
             shouldThrow();
-        }
-        catch (RuntimeException rt) {}
+        } catch (IllegalArgumentException success) {}
     }
 
     /**
-     *
+     * Constructor with non-reference field throws ClassCastException
      */
-    public void testConstructor3(){
-        try{
-            AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
-                a = AtomicReferenceFieldUpdater.newUpdater
-                (getClass(), Integer.class, "w");
+    public void testConstructor4() {
+        try {
+            updaterFor("i");
             shouldThrow();
-        }
-        catch (RuntimeException rt) {}
+        } catch (ClassCastException success) {}
+    }
+
+    /**
+     * construction using private field from subclass throws RuntimeException
+     */
+    public void testPrivateFieldInSubclass() {
+        new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
+            .checkPrivateAccess();
+    }
+
+    /**
+     * construction from unrelated class; package access is allowed,
+     * private access is not
+     */
+    public void testUnrelatedClassAccess() {
+        new NonNestmates().checkPackageAccess(this);
+        new NonNestmates().checkPrivateAccess(this);
     }
 
     /**
-     *
+     * get returns the last value set or assigned
      */
-    public void testGetSet(){
-        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
+    public void testGetSet() {
+        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
         x = one;
-	assertEquals(one,a.get(this));
-	a.set(this,two);
-	assertEquals(two,a.get(this));
-	a.set(this,-3);
-	assertEquals(-3,a.get(this));
-	
+        assertSame(one, a.get(this));
+        a.set(this, two);
+        assertSame(two, a.get(this));
+        a.set(this, m3);
+        assertSame(m3, a.get(this));
     }
+
     /**
-     *
+     * get returns the last value lazySet by same thread
      */
-    public void testCompareAndSet(){
-        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
+    public void testGetLazySet() {
+        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
         x = one;
-	assertTrue(a.compareAndSet(this,one,two));
-	assertTrue(a.compareAndSet(this,two,m4));
-	assertEquals(m4,a.get(this));
-	assertFalse(a.compareAndSet(this,m5,seven));
-	assertFalse((seven == a.get(this)));
-	assertTrue(a.compareAndSet(this,m4,seven));
-	assertEquals(seven,a.get(this));
+        assertSame(one, a.get(this));
+        a.lazySet(this, two);
+        assertSame(two, a.get(this));
+        a.lazySet(this, m3);
+        assertSame(m3, a.get(this));
+    }
+
+    /**
+     * compareAndSet succeeds in changing value if same as expected else fails
+     */
+    public void testCompareAndSet() {
+        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
+        x = one;
+        assertTrue(a.compareAndSet(this, one, two));
+        assertTrue(a.compareAndSet(this, two, m4));
+        assertSame(m4, a.get(this));
+        assertFalse(a.compareAndSet(this, m5, seven));
+        assertNotSame(seven, a.get(this));
+        assertTrue(a.compareAndSet(this, m4, seven));
+        assertSame(seven, a.get(this));
+    }
+
+    /**
+     * compareAndSet succeeds in changing protected field value if
+     * same as expected else fails
+     */
+    public void testCompareAndSetProtectedInSubclass() {
+        new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
+            .checkCompareAndSetProtectedSub();
+    }
+
+    /**
+     * compareAndSet in one thread enables another waiting for value
+     * to succeed
+     */
+    public void testCompareAndSetInMultipleThreads() throws Exception {
+        x = one;
+        final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
+
+        Thread t = new Thread(new CheckedRunnable() {
+            public void realRun() {
+                while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
+                    Thread.yield();
+            }});
+
+        t.start();
+        assertTrue(a.compareAndSet(this, one, two));
+        t.join(LONG_DELAY_MS);
+        assertFalse(t.isAlive());
+        assertSame(three, a.get(this));
     }
 
     /**
-     *
+     * repeated weakCompareAndSet succeeds in changing value when same as expected
      */
-    public void testWeakCompareAndSet(){
-        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
+    public void testWeakCompareAndSet() {
+        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
         x = one;
-	while(!a.weakCompareAndSet(this,one,two));
-	while(!a.weakCompareAndSet(this,two,m4));
-	assertEquals(m4,a.get(this));
-	while(!a.weakCompareAndSet(this,m4,seven));
-	assertEquals(seven,a.get(this));
+        do {} while (!a.weakCompareAndSet(this, one, two));
+        do {} while (!a.weakCompareAndSet(this, two, m4));
+        assertSame(m4, a.get(this));
+        do {} while (!a.weakCompareAndSet(this, m4, seven));
+        assertSame(seven, a.get(this));
     }
 
     /**
-     *
+     * getAndSet returns previous value and sets to given value
      */
-    public void testGetAndSet(){
-        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
+    public void testGetAndSet() {
+        AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a;
+        a = updaterFor("x");
         x = one;
-	assertEquals(one,a.getAndSet(this, zero));
-	assertEquals(zero,a.getAndSet(this,m10));
-	assertEquals(m10,a.getAndSet(this,1));
+        assertSame(one, a.getAndSet(this, zero));
+        assertSame(zero, a.getAndSet(this, m10));
+        assertSame(m10, a.getAndSet(this, 1));
     }
 
 }