Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/debugger/MappedByteBufferDataSource.java @ 210:05712c37c828
6676016: ParallelOldGC leaks memory
Summary: ensure that GCTask threads release resource and handle memory
Reviewed-by: jmasa, chrisphi
author | jcoomes |
---|---|
date | Wed, 18 Jun 2008 18:36:47 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.debugger; import java.io.*; import java.nio.*; /** Implementation of DataSource using MappedByteBuffer. This works around a performance problem in JDK 1.4 where ByteBuffer's operations always become virtual calls rather than being inlined. Need to fix this soon. */ public class MappedByteBufferDataSource implements DataSource { private MappedByteBuffer buf; public MappedByteBufferDataSource(MappedByteBuffer buf) { this.buf = buf; } public byte readByte() throws IOException { return buf.get(); } public short readShort() throws IOException { return buf.getShort(); } public int readInt() throws IOException { return buf.getInt(); } public long readLong() throws IOException { return buf.getLong(); } public int read(byte[] b) throws IOException { buf.get(b); return b.length; } public void seek(long pos) throws IOException { try { buf.position((int) pos); } catch (IllegalArgumentException e) { System.err.println("Error seeking to file position 0x" + Long.toHexString(pos)); throw(e); } } public long getFilePointer() throws IOException { return buf.position(); } public void close() throws IOException { buf = null; } }