test/jdk/java/nio/channels/Selector/SelectAndClose.java
author bpb
Thu, 31 May 2018 07:37:06 -0700
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8203765: java/nio/channels/Selector/SelectAndClose: add some prints and @intermittent tag Reviewed-by: alanb
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/*
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 * Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/* @test
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 * @bug 5004077 8203765
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 * @summary Check blocking of select and close
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 */
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import java.io.IOException;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MonitorInfo;
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import java.lang.management.ThreadInfo;
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import java.nio.channels.Selector;
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public class SelectAndClose {
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    static Selector selector;
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    static volatile boolean awakened = false;
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    private static boolean mightHoldLock(Thread t, Object lock) {
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        long tid = t.getId();
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        int hash = System.identityHashCode(lock);
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        ThreadInfo ti = ManagementFactory.getThreadMXBean().
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            getThreadInfo(new long[]{ tid} , true, false, 100)[0];
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        if (ti != null) {
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            for (MonitorInfo mi : ti.getLockedMonitors()) {
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                if (mi.getIdentityHashCode() == hash)
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                    return true;
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            }
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        }
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        return false;
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    }
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    public static void main(String[] args) throws Exception {
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        selector = Selector.open();
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        // Create and start a selector in a separate thread.
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        Thread selectThread = new Thread(new Runnable() {
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                public void run() {
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                    try {
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                        selector.select();
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                        awakened = true;
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                    } catch (IOException e) {
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                        e.printStackTrace();
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                    }
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                }
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            });
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        selectThread.start();
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        // Spin until the monitor of the selected-key set is likely held
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        // as selected operations are specified to synchronize on the
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        // selected-key set.
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        while (!mightHoldLock(selectThread, selector.selectedKeys())) {
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            Thread.sleep(50);
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        }
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        // Close the selector.
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        selector.close();
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        if (!awakened)
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            selector.wakeup();
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        // Wait for select() thread to finish.
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        selectThread.join();
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        if (!awakened) {
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            throw new RuntimeException("Select did not awaken!");
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        }
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    }
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}