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jdk/test/java/util/concurrent/SynchronousQueue/Fairness.java

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+/*
+ * Copyright 2004 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 4992438
+ * @compile -source 1.5 Fairness.java
+ * @run main Fairness
+ * @summary Checks that fairness setting is respected.
+ */
+
+import java.util.concurrent.*;
+
+public class Fairness {
+    private static void testFairness(boolean fair,
+                                     final BlockingQueue<Integer> q)
+        throws Exception
+    {
+        for (int i = 0; i < 3; i++) {
+            final Integer I = new Integer(i);
+            new Thread() { public void run() {
+                try { q.put(I); } catch (Exception e) {}
+            }}.start();
+            Thread.currentThread().sleep(100);
+        }
+        for (int i = 0; i < 3; i++) {
+            int j = q.take().intValue();
+            System.err.printf("%d%n",j);
+            // Non-fair queues are lifo in our implementation
+            if (fair ? j != i : j != 2-i)
+                throw new Exception("No fair!");
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        testFairness(false, new SynchronousQueue<Integer>());
+        testFairness(false, new SynchronousQueue<Integer>(false));
+        testFairness(true,  new SynchronousQueue<Integer>(true));
+    }
+}