hotspot/test/runtime/logging/SafepointTestMain.java
author rprotacio
Wed, 04 Nov 2015 14:32:51 -0500
changeset 33763 cec2333f839c
child 34127 ddcf152b170f
permissions -rw-r--r--
8140348: Convert TraceSafepoint to Unified Logging Summary: The former -XX:+TraceSafepoint flag is updated to the unified logging framework and is now replaced with -Xlog:safepoint in product mode. Reviewed-by: coleenp, hseigel

/*
 * Copyright (c) 2015, 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.
 *
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 * questions.
 */

import java.lang.ref.WeakReference;

public class SafepointTestMain {
    public static class B {
        static int count = 0;
        public static volatile boolean stop = false;
        static void localSleep(int time) {
          try{
            Thread.currentThread().sleep(time);
          } catch(InterruptedException ie) {
          }
        }

        public static void infinite() {
            while (!stop) { count++; }
        }
    }

    public static byte[] garbage;
    public static volatile WeakReference<Object> weakref;

    public static void createweakref() {
        Object o = new Object();
        weakref = new WeakReference<>(o);
    }

    public static void main(String[] args) throws Exception {
        // Run function in separate thread to force compilation and pint safepoint
        // message for compiled method
        new Thread() {
            public void run() {
                B.infinite();
            }
        }.start();
        B.localSleep(1000);
        // Cause several safepoints to run GC while the compiled method is running,
        // to see safepoint messages
        for (int i = 0; i < 2; i++) {
            createweakref();
            while(weakref.get() != null) {
                garbage = new byte[8192];
                System.gc();
            }
        }
        B.stop = true;
    }
}