--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/concurrent/LinkedBlockingQueue/OfferRemoveLoops.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6316155
+ * @summary Test concurrent offer vs. remove
+ * @author Martin Buchholz
+ */
+
+import java.util.concurrent.*;
+
+public class OfferRemoveLoops {
+    private static void realMain(String[] args) throws Throwable {
+        testQueue(new LinkedBlockingQueue<String>(10));
+        testQueue(new LinkedBlockingQueue<String>());
+        testQueue(new LinkedBlockingDeque<String>(10));
+        testQueue(new LinkedBlockingDeque<String>());
+        testQueue(new ArrayBlockingQueue<String>(10));
+        testQueue(new PriorityBlockingQueue<String>(10));
+    }
+
+    private abstract static class ControlledThread extends Thread {
+        abstract protected void realRun();
+        public void run() {
+            try { realRun(); } catch (Throwable t) { unexpected(t); }
+        }
+    }
+
+    private static void testQueue(final BlockingQueue<String> q) throws Throwable {
+        System.out.println(q.getClass());
+        final int count = 10000;
+        Thread t1 = new ControlledThread() {
+                protected void realRun() {
+                    for (int i = 0, j = 0; i < count; i++)
+                        while (! q.remove(String.valueOf(i)))
+                            Thread.yield();}};
+        Thread t2 = new ControlledThread() {
+                protected void realRun() {
+                    for (int i = 0, j = 0; i < count; i++)
+                        while (! q.offer(String.valueOf(i)))
+                            Thread.yield();}};
+        t1.setDaemon(true); t2.setDaemon(true);
+        t1.start(); t2.start();
+        t1.join(10000); t2.join(10000);
+        check(! t1.isAlive());
+        check(! t2.isAlive());
+    }
+
+    //--------------------- Infrastructure ---------------------------
+    static volatile int passed = 0, failed = 0;
+    static void pass() { passed++; }
+    static void fail() { failed++; Thread.dumpStack(); }
+    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
+    static void check(boolean cond) { if (cond) pass(); else fail(); }
+    static void equal(Object x, Object y) {
+        if (x == null ? y == null : x.equals(y)) pass();
+        else {System.out.println(x + " not equal to " + y); fail(); }}
+
+    public static void main(String[] args) throws Throwable {
+        try { realMain(args); } catch (Throwable t) { unexpected(t); }
+
+        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
+        if (failed > 0) throw new Exception("Some tests failed");
+    }
+}