--- a/jdk/src/java.base/share/classes/jdk/internal/jimage/concurrent/ConcurrentPReader.java	Wed Jul 05 20:41:30 2017 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,149 +0,0 @@
-/*
- * Copyright (c) 2014, 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.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package jdk.internal.jimage.concurrent;
-
-import java.io.FileDescriptor;
-import java.io.FileInputStream;
-import java.io.IOException;
-
-import jdk.internal.jimage.PReader;
-
-import sun.misc.Unsafe;
-
-/**
- * A PReader implementation that supports concurrent pread operations.
- */
-public class ConcurrentPReader extends PReader {
-
-    private static final Unsafe UNSAFE = Unsafe.getUnsafe();
-    private static final long BA_OFFSET = (long) UNSAFE.arrayBaseOffset(byte[].class);
-
-    /**
-     * A temporary buffer that is cached on a per-thread basis.
-     */
-    private static class TemporaryBuffer {
-        static final ThreadLocal<TemporaryBuffer> CACHED_BUFFER =
-             new ThreadLocal<TemporaryBuffer>() {
-                @Override
-                protected TemporaryBuffer initialValue() { return null; }
-             };
-
-        static final TemporaryBuffer NOT_AVAILABLE = new TemporaryBuffer(0L, 0);
-
-        final long address;
-        final int size;
-
-        TemporaryBuffer(long address, int size) {
-            this.address = address;
-            this.size = size;
-        }
-
-        long address() { return address; }
-        int size() { return size; }
-
-        /**
-         * Returns the {@code TemporaryBuffer} for the current thread. The buffer
-         * is guaranteed to be of at least the given size. Returns {@code null}
-         * if a buffer cannot be cached for this thread.
-         */
-        static TemporaryBuffer get(int len) {
-            TemporaryBuffer buffer = CACHED_BUFFER.get();
-
-            // cached buffer large enough?
-            if (buffer != null && buffer.size() >= len) {
-                return buffer;
-            }
-
-            // if this is an InnocuousThread then don't return anything
-            if (buffer == NOT_AVAILABLE)
-                return null;
-
-            if (buffer != null) {
-                // replace buffer in cache with a larger buffer
-                long originalAddress = buffer.address();
-                long address = UNSAFE.allocateMemory(len);
-                buffer = new TemporaryBuffer(address, len);
-                CACHED_BUFFER.set(buffer);
-                UNSAFE.freeMemory(originalAddress);
-            } else {
-                // first usage.
-                if (Thread.currentThread() instanceof sun.misc.InnocuousThread) {
-                    buffer = NOT_AVAILABLE;
-                } else {
-                    long address = UNSAFE.allocateMemory(len);
-                    buffer = new TemporaryBuffer(address, len);
-                }
-                CACHED_BUFFER.set(buffer);
-            }
-            return buffer;
-        }
-    }
-
-    private final FileDescriptor fd;
-
-    private ConcurrentPReader(FileInputStream fis) throws IOException {
-        super(fis.getChannel());
-        this.fd = fis.getFD();
-    }
-
-    public ConcurrentPReader(String file) throws IOException {
-        this(new FileInputStream(file));
-    }
-
-    @Override
-    public byte[] read(int len, long position) throws IOException {
-        // need a temporary area of memory to read into
-        TemporaryBuffer buffer = TemporaryBuffer.get(len);
-        long address;
-        if (buffer == null) {
-            address = UNSAFE.allocateMemory(len);
-        } else {
-            address = buffer.address();
-        }
-        try {
-            int n = pread(fd, address, len, position);
-            if (n != len)
-                throw new InternalError("short read, not handled yet");
-            byte[] result = new byte[n];
-            UNSAFE.copyMemory(null, address, result, BA_OFFSET, len);
-            return result;
-        } finally {
-            if (buffer == null) {
-                UNSAFE.freeMemory(address);
-            }
-        }
-    }
-
-    private static native int pread(FileDescriptor fd, long address, int len, long pos)
-        throws IOException;
-
-    private static native void initIDs();
-
-    static {
-        System.loadLibrary("java");
-        initIDs();
-    }
-}