| /* |
| * Copyright (c) 2000, 2010, 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 sun.nio.ch; |
| |
| import java.nio.ByteBuffer; |
| import jdk.internal.ref.CleanerFactory; |
| |
| |
| /** |
| * Manipulates a native array of iovec structs on Solaris: |
| * |
| * typedef struct iovec { |
| * caddr_t iov_base; |
| int iov_len; |
| * } iovec_t; |
| * |
| * @author Mike McCloskey |
| * @since 1.4 |
| */ |
| |
| class IOVecWrapper { |
| |
| // Miscellaneous constants |
| private static final int BASE_OFFSET = 0; |
| private static final int LEN_OFFSET; |
| private static final int SIZE_IOVEC; |
| |
| // The iovec array |
| private final AllocatedNativeObject vecArray; |
| |
| // Number of elements in iovec array |
| private final int size; |
| |
| // Buffers and position/remaining corresponding to elements in iovec array |
| private final ByteBuffer[] buf; |
| private final int[] position; |
| private final int[] remaining; |
| |
| // Shadow buffers for cases when original buffer is substituted |
| private final ByteBuffer[] shadow; |
| |
| // Base address of this array |
| final long address; |
| |
| // Address size in bytes |
| static int addressSize; |
| |
| private static class Deallocator implements Runnable { |
| private final AllocatedNativeObject obj; |
| Deallocator(AllocatedNativeObject obj) { |
| this.obj = obj; |
| } |
| public void run() { |
| obj.free(); |
| } |
| } |
| |
| // per thread IOVecWrapper |
| private static final ThreadLocal<IOVecWrapper> cached = |
| new ThreadLocal<IOVecWrapper>(); |
| |
| private IOVecWrapper(int size) { |
| this.size = size; |
| this.buf = new ByteBuffer[size]; |
| this.position = new int[size]; |
| this.remaining = new int[size]; |
| this.shadow = new ByteBuffer[size]; |
| this.vecArray = new AllocatedNativeObject(size * SIZE_IOVEC, false); |
| this.address = vecArray.address(); |
| } |
| |
| static IOVecWrapper get(int size) { |
| IOVecWrapper wrapper = cached.get(); |
| if (wrapper != null && wrapper.size < size) { |
| // not big enough; eagerly release memory |
| wrapper.vecArray.free(); |
| wrapper = null; |
| } |
| if (wrapper == null) { |
| wrapper = new IOVecWrapper(size); |
| CleanerFactory.cleaner().register(wrapper, new Deallocator(wrapper.vecArray)); |
| cached.set(wrapper); |
| } |
| return wrapper; |
| } |
| |
| void setBuffer(int i, ByteBuffer buf, int pos, int rem) { |
| this.buf[i] = buf; |
| this.position[i] = pos; |
| this.remaining[i] = rem; |
| } |
| |
| void setShadow(int i, ByteBuffer buf) { |
| shadow[i] = buf; |
| } |
| |
| ByteBuffer getBuffer(int i) { |
| return buf[i]; |
| } |
| |
| int getPosition(int i) { |
| return position[i]; |
| } |
| |
| int getRemaining(int i) { |
| return remaining[i]; |
| } |
| |
| ByteBuffer getShadow(int i) { |
| return shadow[i]; |
| } |
| |
| void clearRefs(int i) { |
| buf[i] = null; |
| shadow[i] = null; |
| } |
| |
| void putBase(int i, long base) { |
| int offset = SIZE_IOVEC * i + BASE_OFFSET; |
| if (addressSize == 4) |
| vecArray.putInt(offset, (int)base); |
| else |
| vecArray.putLong(offset, base); |
| } |
| |
| void putLen(int i, long len) { |
| int offset = SIZE_IOVEC * i + LEN_OFFSET; |
| if (addressSize == 4) |
| vecArray.putInt(offset, (int)len); |
| else |
| vecArray.putLong(offset, len); |
| } |
| |
| static { |
| addressSize = Util.unsafe().addressSize(); |
| LEN_OFFSET = addressSize; |
| SIZE_IOVEC = (short) (addressSize * 2); |
| } |
| } |