1 files changed, 147 insertions, 0 deletions
diff --git a/jsr166-tests/src/test/java/jsr166/AtomicStampedReferenceTest.java b/jsr166-tests/src/test/java/jsr166/AtomicStampedReferenceTest.java
new file mode 100644
index 0000000000..3e6445ed66
--- /dev/null
+++ b/jsr166-tests/src/test/java/jsr166/AtomicStampedReferenceTest.java
@@ -0,0 +1,147 @@
+/*
+ * 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.
+ */
+
+package jsr166;
+
+import junit.framework.*;
+import java.util.concurrent.atomic.AtomicStampedReference;
+
+public class AtomicStampedReferenceTest extends JSR166TestCase {
+
+    /**
+     * constructor initializes to given reference and stamp
+     */
+    public void testConstructor() {
+        AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        assertSame(one, ai.getReference());
+        assertEquals(0, ai.getStamp());
+        AtomicStampedReference a2 = new AtomicStampedReference(null, 1);
+        assertNull(a2.getReference());
+        assertEquals(1, a2.getStamp());
+    }
+
+    /**
+     * get returns the last values of reference and stamp set
+     */
+    public void testGetSet() {
+        int[] mark = new int[1];
+        AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        assertSame(one, ai.getReference());
+        assertEquals(0, ai.getStamp());
+        assertSame(one, ai.get(mark));
+        assertEquals(0, mark[0]);
+        ai.set(two, 0);
+        assertSame(two, ai.getReference());
+        assertEquals(0, ai.getStamp());
+        assertSame(two, ai.get(mark));
+        assertEquals(0, mark[0]);
+        ai.set(one, 1);
+        assertSame(one, ai.getReference());
+        assertEquals(1, ai.getStamp());
+        assertSame(one, ai.get(mark));
+        assertEquals(1, mark[0]);
+    }
+
+    /**
+     * attemptStamp succeeds in single thread
+     */
+    public void testAttemptStamp() {
+        int[] mark = new int[1];
+        AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        assertEquals(0, ai.getStamp());
+        assertTrue(ai.attemptStamp(one, 1));
+        assertEquals(1, ai.getStamp());
+        assertSame(one, ai.get(mark));
+        assertEquals(1, mark[0]);
+    }
+
+    /**
+     * compareAndSet succeeds in changing values if equal to expected reference
+     * and stamp else fails
+     */
+    public void testCompareAndSet() {
+        int[] mark = new int[1];
+        AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        assertSame(one, ai.get(mark));
+        assertEquals(0, ai.getStamp());
+        assertEquals(0, mark[0]);
+
+        assertTrue(ai.compareAndSet(one, two, 0, 0));
+        assertSame(two, ai.get(mark));
+        assertEquals(0, mark[0]);
+
+        assertTrue(ai.compareAndSet(two, m3, 0, 1));
+        assertSame(m3, ai.get(mark));
+        assertEquals(1, mark[0]);
+
+        assertFalse(ai.compareAndSet(two, m3, 1, 1));
+        assertSame(m3, ai.get(mark));
+        assertEquals(1, mark[0]);
+    }
+
+    /**
+     * compareAndSet in one thread enables another waiting for reference value
+     * to succeed
+     */
+    public void testCompareAndSetInMultipleThreads() throws Exception {
+        final AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        Thread t = new Thread(new CheckedRunnable() {
+            public void realRun() {
+                while (!ai.compareAndSet(two, three, 0, 0))
+                    Thread.yield();
+            }});
+
+        t.start();
+        assertTrue(ai.compareAndSet(one, two, 0, 0));
+        t.join(LONG_DELAY_MS);
+        assertFalse(t.isAlive());
+        assertSame(three, ai.getReference());
+        assertEquals(0, ai.getStamp());
+    }
+
+    /**
+     * compareAndSet in one thread enables another waiting for stamp value
+     * to succeed
+     */
+    public void testCompareAndSetInMultipleThreads2() throws Exception {
+        final AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        Thread t = new Thread(new CheckedRunnable() {
+            public void realRun() {
+                while (!ai.compareAndSet(one, one, 1, 2))
+                    Thread.yield();
+            }});
+
+        t.start();
+        assertTrue(ai.compareAndSet(one, one, 0, 1));
+        t.join(LONG_DELAY_MS);
+        assertFalse(t.isAlive());
+        assertSame(one, ai.getReference());
+        assertEquals(2, ai.getStamp());
+    }
+
+    /**
+     * repeated weakCompareAndSet succeeds in changing values when equal
+     * to expected
+     */
+    public void testWeakCompareAndSet() {
+        int[] mark = new int[1];
+        AtomicStampedReference ai = new AtomicStampedReference(one, 0);
+        assertSame(one, ai.get(mark));
+        assertEquals(0, ai.getStamp());
+        assertEquals(0, mark[0]);
+
+        while (!ai.weakCompareAndSet(one, two, 0, 0));
+        assertSame(two, ai.get(mark));
+        assertEquals(0, mark[0]);
+
+        while (!ai.weakCompareAndSet(two, m3, 0, 1));
+        assertSame(m3, ai.get(mark));
+        assertEquals(1, mark[0]);
+    }
+
+}