1 //****************************************************************************** 2 // 3 // File: Unsigned16BitIntegerMatrixBuf_1.java 4 // Package: edu.rit.mp.buf 5 // Unit: Class edu.rit.mp.buf.Unsigned16BitIntegerMatrixBuf_1 6 // 7 // This Java source file is copyright (C) 2009 by Alan Kaminsky. All rights 8 // reserved. For further information, contact the author, Alan Kaminsky, at 9 // ark@cs.rit.edu. 10 // 11 // This Java source file is part of the Parallel Java Library ("PJ"). PJ is free 12 // software; you can redistribute it and/or modify it under the terms of the GNU 13 // General Public License as published by the Free Software Foundation; either 14 // version 3 of the License, or (at your option) any later version. 15 // 16 // PJ is distributed in the hope that it will be useful, but WITHOUT ANY 17 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 18 // A PARTICULAR PURPOSE. See the GNU General Public License for more details. 19 // 20 // Linking this library statically or dynamically with other modules is making a 21 // combined work based on this library. Thus, the terms and conditions of the GNU 22 // General Public License cover the whole combination. 23 // 24 // As a special exception, the copyright holders of this library give you 25 // permission to link this library with independent modules to produce an 26 // executable, regardless of the license terms of these independent modules, and 27 // to copy and distribute the resulting executable under terms of your choice, 28 // provided that you also meet, for each linked independent module, the terms 29 // and conditions of the license of that module. An independent module is a module 30 // which is not derived from or based on this library. If you modify this library, 31 // you may extend this exception to your version of the library, but you are not 32 // obligated to do so. If you do not wish to do so, delete this exception 33 // statement from your version. 34 // 35 // A copy of the GNU General Public License is provided in the file gpl.txt. You 36 // may also obtain a copy of the GNU General Public License on the World Wide 37 // Web at http://www.gnu.org/licenses/gpl.html. 38 // 39 //****************************************************************************** 40 package edu.rit.mp.buf; 41 42 import java.nio.ByteBuffer; 43 import java.nio.ShortBuffer; 44 45 import edu.rit.mp.Buf; 46 import edu.rit.pj.reduction.IntegerOp; 47 import edu.rit.pj.reduction.Op; 48 import edu.rit.util.Range; 49 50 /** 51 * Class Unsigned16BitIntegerMatrixBuf_1 provides a buffer for a matrix of 52 * unsigned 16-bit integer items sent or received using the Message Protocol 53 * (MP). The matrix row and column strides must both be 1. While an instance of 54 * class Unsigned16BitIntegerMatrixBuf_1 may be constructed directly, normally 55 * you will use a factory method in class {@linkplain 56 * edu.rit.mp.Unsigned16BitIntegerBuf Unsigned16BitIntegerBuf}. See that class 57 * for further information. 58 * 59 * @author Alan Kaminsky 60 * @version 05-Apr-2009 61 */ 62 public class Unsigned16BitIntegerMatrixBuf_1 63 extends Unsigned16BitIntegerMatrixBuf { 64 65 // Exported constructors. 66 /** 67 * Construct a new unsigned 16-bit integer matrix buffer. It is assumed that 68 * the rows and columns of <code>theMatrix</code> are allocated and that each 69 * row of <code>theMatrix</code> has the same number of columns. 70 * 71 * @param theMatrix Matrix. 72 * @param theRowRange Range of rows to include. The stride is assumed to be 73 * 1. 74 * @param theColRange Range of columns to include. The stride is assumed to 75 * be 1. 76 */ 77 public Unsigned16BitIntegerMatrixBuf_1(int[][] theMatrix, 78 Range theRowRange, 79 Range theColRange) { 80 super(theMatrix, theRowRange, theColRange); 81 } 82 83 // Exported operations. 84 /** 85 * {@inheritDoc} 86 * 87 * Obtain the given item from this buffer. 88 * <P> 89 * The <code>get()</code> method must not block the calling thread; if it does, 90 * all message I/O in MP will be blocked. 91 */ 92 public int get(int i) { 93 return myMatrix[i2r(i) + myLowerRow][i2c(i) + myLowerCol]; 94 } 95 96 /** 97 * {@inheritDoc} 98 * 99 * Store the given item in this buffer. 100 * <P> 101 * The <code>put()</code> method must not block the calling thread; if it does, 102 * all message I/O in MP will be blocked. 103 */ 104 public void put(int i, 105 int item) { 106 myMatrix[i2r(i) + myLowerRow][i2c(i) + myLowerCol] = item; 107 } 108 109 /** 110 * {@inheritDoc} 111 * 112 * Create a buffer for performing parallel reduction using the given binary 113 * operation. The results of the reduction are placed into this buffer. 114 * @exception ClassCastException (unchecked exception) Thrown if this 115 * buffer's element data type and the given binary operation's argument data 116 * type are not the same. 117 */ 118 public Buf getReductionBuf(Op op) { 119 return new Unsigned16BitIntegerMatrixReductionBuf_1(myMatrix, myRowRange, myColRange, (IntegerOp) op); 120 } 121 122 // Hidden operations. 123 /** 124 * {@inheritDoc} 125 * 126 * Send as many items as possible from this buffer to the given byte buffer. 127 * <P> 128 * The <code>sendItems()</code> method must not block the calling thread; if it 129 * does, all message I/O in MP will be blocked. 130 */ 131 protected int sendItems(int i, 132 ByteBuffer buffer) { 133 ShortBuffer shortbuffer = buffer.asShortBuffer(); 134 int n = 0; 135 int r = i2r(i); 136 int row = r + myLowerRow; 137 int c = i2c(i); 138 int col = c + myLowerCol; 139 int ncols = Math.min(myColCount - c, shortbuffer.remaining()); 140 while (r < myRowCount && ncols > 0) { 141 int[] myMatrix_row = myMatrix[row]; 142 while (c < ncols) { 143 shortbuffer.put((short) myMatrix_row[col]); 144 ++c; 145 ++col; 146 } 147 n += ncols; 148 ++r; 149 ++row; 150 c = 0; 151 col = myLowerCol; 152 ncols = Math.min(myColCount, shortbuffer.remaining()); 153 } 154 buffer.position(buffer.position() + 2 * n); 155 return n; 156 } 157 158 /** 159 * {@inheritDoc} 160 * 161 * Receive as many items as possible from the given byte buffer to this 162 * buffer. 163 * <P> 164 * The <code>receiveItems()</code> method must not block the calling thread; if 165 * it does, all message I/O in MP will be blocked. 166 */ 167 protected int receiveItems(int i, 168 int num, 169 ByteBuffer buffer) { 170 ShortBuffer shortbuffer = buffer.asShortBuffer(); 171 num = Math.min(num, shortbuffer.remaining()); 172 int n = 0; 173 int r = i2r(i); 174 int row = r + myLowerRow; 175 int c = i2c(i); 176 int col = c + myLowerCol; 177 int ncols = Math.min(myColCount - c, num); 178 while (r < myRowCount && ncols > 0) { 179 int[] myMatrix_row = myMatrix[row]; 180 for (c = 0; c < ncols; ++c) { 181 myMatrix_row[col] = shortbuffer.get() & 0xFFFF; 182 ++col; 183 } 184 num -= ncols; 185 n += ncols; 186 ++r; 187 ++row; 188 col = myLowerCol; 189 ncols = Math.min(myColCount, num); 190 } 191 buffer.position(buffer.position() + 2 * n); 192 return n; 193 } 194 195 }