1 /* 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.nio.ch; 27 28 import sun.misc.*; 29 30 31 /** 32 * Manipulates a native array of pollfd structs. 33 * 34 * @author Mike McCloskey 35 * @since 1.4 36 */ 37 38 public abstract class AbstractPollArrayWrapper { 39 40 // Miscellaneous constants 41 static final short SIZE_POLLFD = 8; 42 static final short FD_OFFSET = 0; 43 static final short EVENT_OFFSET = 4; 44 static final short REVENT_OFFSET = 6; 45 46 // The poll fd array 47 protected AllocatedNativeObject pollArray; 48 49 // Number of valid entries in the pollArray 50 protected int totalChannels = 0; 51 52 // Base address of the native pollArray 53 protected long pollArrayAddress; 54 55 // Access methods for fd structures 56 int getEventOps(int i) { 57 int offset = SIZE_POLLFD * i + EVENT_OFFSET; 58 return pollArray.getShort(offset); 59 } 60 61 int getReventOps(int i) { 62 int offset = SIZE_POLLFD * i + REVENT_OFFSET; 63 return pollArray.getShort(offset); 64 } 65 66 int getDescriptor(int i) { 67 int offset = SIZE_POLLFD * i + FD_OFFSET; 68 return pollArray.getInt(offset); 69 } 70 71 void putEventOps(int i, int event) { 72 int offset = SIZE_POLLFD * i + EVENT_OFFSET; 73 pollArray.putShort(offset, (short)event); 74 } 75 76 void putReventOps(int i, int revent) { 77 int offset = SIZE_POLLFD * i + REVENT_OFFSET; 78 pollArray.putShort(offset, (short)revent); 79 } 80 81 void putDescriptor(int i, int fd) { 82 int offset = SIZE_POLLFD * i + FD_OFFSET; 83 pollArray.putInt(offset, fd); 84 } 85 86 } 87
