diff test/compiler/testlibrary/rtm/BusyLock.java @ 17871:665bbe93823f

8039499: Add all common classes used by tests on RTM support to testlibrary Reviewed-by: kvn, iignatyev Contributed-by: filipp.zhinkin@oracle.com
author iignatyev
date Mon, 14 Apr 2014 19:29:34 +0400
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/testlibrary/rtm/BusyLock.java	Mon Apr 14 19:29:34 2014 +0400
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package rtm;
+
+import com.oracle.java.testlibrary.Utils;
+import sun.misc.Unsafe;
+
+import java.util.concurrent.BrokenBarrierException;
+import java.util.concurrent.CyclicBarrier;
+
+/**
+ * Test case for busy lock scenario.
+ * One thread enters the monitor and sleep for a while.
+ * Another thread is blocked on the same monitor.
+ */
+public class BusyLock implements CompilableTest, Runnable {
+    private static final int DEFAULT_TIMEOUT = 1000;
+    private final CyclicBarrier barrier;
+
+    // Following field have to be static in order to avoid escape analysis.
+    @SuppressWarnings("UnsuedDeclaration")
+    private static int field = 0;
+    private static final Unsafe UNSAFE = Utils.getUnsafe();
+    protected final Object monitor;
+    protected final int timeout;
+
+    public BusyLock() {
+        this(BusyLock.DEFAULT_TIMEOUT);
+    }
+
+    public BusyLock(int timeout) {
+        this.timeout = timeout;
+        this.monitor = new Object();
+        this.barrier = new CyclicBarrier(2);
+    }
+
+    @Override
+    public void run() {
+        try {
+            // wait until forceAbort leave monitor
+            barrier.await();
+            if (UNSAFE.tryMonitorEnter(monitor)) {
+                try {
+                    barrier.await();
+                    Thread.sleep(timeout);
+                } finally {
+                    UNSAFE.monitorExit(monitor);
+                }
+            } else {
+                throw new RuntimeException("Monitor should be entered by " +
+                                           "::run() first.");
+            }
+        } catch (InterruptedException | BrokenBarrierException e) {
+            throw new RuntimeException("Synchronization error happened.", e);
+        }
+    }
+
+    public void test() {
+        try {
+            barrier.await();
+            // wait until monitor is locked by a ::run method
+            barrier.await();
+        } catch (InterruptedException | BrokenBarrierException e) {
+            throw new RuntimeException("Synchronization error happened.", e);
+        }
+        synchronized(monitor) {
+            BusyLock.field++;
+        }
+    }
+
+    @Override
+    public String getMethodWithLockName() {
+        return this.getClass().getName() + "::test";
+    }
+
+    @Override
+    public String[] getMethodsToCompileNames() {
+        return new String[] { getMethodWithLockName() };
+    }
+
+    /**
+     * Usage:
+     * BusyLock [ <inflate monitor> [ <timeout> ] ]
+     *
+     * Default values are:
+     * <ul>
+     *     <li>inflate monitor = {@code true}</li>
+     *     <li>timeout = {@code BusyLock.DEFAULT_TIMEOUT}</li>
+     * </ul>
+     */
+    public static void main(String args[]) throws Exception {
+        int timeoutValue = BusyLock.DEFAULT_TIMEOUT;
+        boolean inflateMonitor = true;
+
+        if (args.length > 0 ) {
+            inflateMonitor = Boolean.valueOf(args[0]);
+
+            if (args.length > 1) {
+                timeoutValue = Integer.valueOf(args[1]);
+            }
+        }
+
+        BusyLock busyLock = new BusyLock(timeoutValue);
+
+        if (inflateMonitor) {
+            AbortProvoker.inflateMonitor(busyLock.monitor);
+        }
+
+        Thread t = new Thread(busyLock);
+        t.start();
+        busyLock.test();
+        t.join();
+    }
+}