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/*
* 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 sun.misc.*;
/**
* 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);
Cleaner.create(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);
}
}
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