57 lines
2.0 KiB
Java
57 lines
2.0 KiB
Java
/*
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* Copyright (c) 2003, 2011, 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 4802340
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* @summary Testing force(), load() isLoaded() of zero len MBB
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* @run main/othervm ZeroMap
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* @key randomness
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*/
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import java.io.*;
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import java.nio.*;
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import java.util.*;
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import java.nio.channels.*;
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public class ZeroMap {
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public static void main(String[] args) throws Exception {
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Random random = new Random();
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long filesize = random.nextInt(1024*1024);
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int cut = random.nextInt((int)filesize);
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File file = File.createTempFile("Blah", null);
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file.deleteOnExit();
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try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
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raf.setLength(filesize);
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FileChannel fc = raf.getChannel();
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MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, cut, 0);
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mbb.force();
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mbb.load();
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mbb.isLoaded();
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}
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// improve chance that mapped buffer will be unmapped
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System.gc();
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Thread.sleep(500);
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}
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}
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