jdk/src/java.base/share/classes/sun/nio/ch/FileLockImpl.java
author redestad
Mon, 21 Dec 2015 20:54:00 +0100
changeset 34774 03b4e6dc367b
parent 25859 3317bb8137f4
permissions -rw-r--r--
8145680: Remove unnecessary explicit initialization of volatile variables in java.base Reviewed-by: alanb, chegar, jfranck, shade
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/*
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 * Copyright (c) 2001, 2009, 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.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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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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package sun.nio.ch;
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import java.io.IOException;
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import java.nio.channels.*;
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public class FileLockImpl
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    extends FileLock
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{
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    private volatile boolean invalid;
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    FileLockImpl(FileChannel channel, long position, long size, boolean shared)
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    {
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        super(channel, position, size, shared);
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    }
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    FileLockImpl(AsynchronousFileChannel channel, long position, long size, boolean shared)
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    {
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        super(channel, position, size, shared);
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    }
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    public boolean isValid() {
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        return !invalid;
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    }
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    void invalidate() {
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        assert Thread.holdsLock(this);
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        invalid = true;
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    }
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    public synchronized void release() throws IOException {
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        Channel ch = acquiredBy();
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        if (!ch.isOpen())
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            throw new ClosedChannelException();
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        if (isValid()) {
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            if (ch instanceof FileChannelImpl)
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                ((FileChannelImpl)ch).release(this);
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            else if (ch instanceof AsynchronousFileChannelImpl)
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                ((AsynchronousFileChannelImpl)ch).release(this);
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            else throw new AssertionError();
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            invalidate();
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        }
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    }
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}