diff --git a/test/050-sync-test/src/Main.java b/test/050-sync-test/src/Main.java
new file mode 100644
index 0000000..c2ea192
--- /dev/null
+++ b/test/050-sync-test/src/Main.java
@@ -0,0 +1,179 @@
+// Copyright 2006 The Android Open Source Project
+
+/**
+ * Test synchronization primitives.
+ *
+ * TODO: this should be re-written to be a little more rigorous and/or
+ * useful.  Also, the ThreadDeathHandler stuff should be exposed or
+ * split out.
+ */
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Sleep Test");
+        sleepTest();
+
+        System.out.println("\nCount Test");
+        countTest();
+
+        System.out.println("\nInterrupt Test");
+        interruptTest();
+    }
+
+    static void sleepTest() {
+        System.out.println("GOING");
+        try {
+            Thread.sleep(1000);
+        }
+        catch (InterruptedException ie) {
+            System.out.println("INTERRUPT!");
+            ie.printStackTrace();
+        }
+        System.out.println("GONE");
+    }
+
+    static void countTest() {
+        CpuThread one, two;
+
+        one = new CpuThread(1);
+        two = new CpuThread(2);
+
+        one.start();
+        two.start();
+
+        try {
+            Thread.sleep(100);
+        }
+        catch (InterruptedException ie) {
+            System.out.println("INTERRUPT!");
+            ie.printStackTrace();
+        }
+
+        //System.out.println("main: off and running");
+
+        try {
+            one.join();
+            two.join();
+        }
+        catch (InterruptedException ie) {
+            System.out.println("INTERRUPT!");
+            ie.printStackTrace();
+        }
+        System.out.println("main: all done");
+    }
+
+    static void interruptTest() {
+        SleepyThread sleepy, pesky;
+
+        sleepy = new SleepyThread(null);
+        pesky = new SleepyThread(sleepy);
+
+        sleepy.setPriority(4);
+        sleepy.start();
+        pesky.start();
+        pesky.setPriority(3);
+    }
+}
+
+class CpuThread extends Thread {
+    static Object mSyncable = new Object();
+    static int mCount = 0;
+    int mNumber;
+
+    CpuThread(int num) {
+        super("CpuThread " + num);
+        mNumber = num;
+    }
+
+    public void run() {
+        //System.out.print("thread running -- ");
+        //System.out.println(Thread.currentThread().getName());
+
+        for (int i = 0; i < 10; i++) {
+            output(mNumber);
+        }
+
+        System.out.print("Final result: ");
+        System.out.println(mCount);
+    }
+
+    void output(int num) {
+        /*
+         * Delete the next line; last "final result" should != 20.
+         */
+        synchronized (mSyncable)
+        {
+            int i, count;
+
+            count = mCount;
+
+            System.out.print("going: ");
+            System.out.println(num);
+
+            /* burn CPU; adjust end value so we exceed scheduler quantum */
+            for (int j = 0; j < 5000; j++)
+                ;
+
+            count++;
+            mCount = count;
+        }
+    }
+}
+
+class SleepyThread extends Thread {
+    private SleepyThread mOther;
+    private Integer[] mWaitOnMe;      // any type of object will do
+
+    private static int count = 0;
+
+    SleepyThread(SleepyThread other) {
+        mOther = other;
+        mWaitOnMe = new Integer[] { 1, 2 };
+
+        setName("thread#" + count);
+        count++;
+    }
+
+    public void run() {
+        System.out.println("SleepyThread.run starting");
+
+        if (false) {
+            ThreadDeathHandler threadHandler =
+                new ThreadDeathHandler("SYNC THREAD");
+            Thread.currentThread().setUncaughtExceptionHandler(threadHandler);
+            throw new NullPointerException("die");
+        }
+
+        if (mOther == null) {
+            boolean intr = false;
+
+            try {
+                synchronized (mWaitOnMe) {
+                    mWaitOnMe.wait(9000);
+                }
+            }
+            catch (InterruptedException ie) {
+                // Expecting this; interrupted should be false.
+                System.out.println(Thread.currentThread().getName() +
+                        " interrupted, flag=" + Thread.interrupted());
+                intr = true;
+            }
+            catch (Exception ex) {
+                ex.printStackTrace();
+            }
+
+            if (!intr)
+                System.out.println("NOT INTERRUPTED");
+        } else {
+            try {
+                Thread.sleep(2000);
+            }
+            catch (InterruptedException ie) {
+                System.out.println("PESKY INTERRUPTED?");
+            }
+
+            System.out.println("interrupting other (isAlive="
+                + mOther.isAlive() + ")");
+            mOther.interrupt();
+        }
+    }
+}