1 /* 2 * Copyright (c) 2001, 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 abstract class AbstractPollArrayWrapper { 39 40 // Event masks 41 static final short POLLIN = 0x0001; 42 static final short POLLOUT = 0x0004; 43 static final short POLLERR = 0x0008; 44 static final short POLLHUP = 0x0010; 45 static final short POLLNVAL = 0x0020; 46 static final short POLLREMOVE = 0x0800; 47 48 // Miscellaneous constants 49 static final short SIZE_POLLFD = 8; 50 static final short FD_OFFSET = 0; 51 static final short EVENT_OFFSET = 4; 52 static final short REVENT_OFFSET = 6; 53 54 // The poll fd array 55 protected AllocatedNativeObject pollArray; 56 57 // Number of valid entries in the pollArray 58 protected int totalChannels = 0; 59 60 // Base address of the native pollArray 61 protected long pollArrayAddress; 62 63 // Access methods for fd structures getEventOps(int i)64 int getEventOps(int i) { 65 int offset = SIZE_POLLFD * i + EVENT_OFFSET; 66 return pollArray.getShort(offset); 67 } 68 getReventOps(int i)69 int getReventOps(int i) { 70 int offset = SIZE_POLLFD * i + REVENT_OFFSET; 71 return pollArray.getShort(offset); 72 } 73 getDescriptor(int i)74 int getDescriptor(int i) { 75 int offset = SIZE_POLLFD * i + FD_OFFSET; 76 return pollArray.getInt(offset); 77 } 78 putEventOps(int i, int event)79 void putEventOps(int i, int event) { 80 int offset = SIZE_POLLFD * i + EVENT_OFFSET; 81 pollArray.putShort(offset, (short)event); 82 } 83 putReventOps(int i, int revent)84 void putReventOps(int i, int revent) { 85 int offset = SIZE_POLLFD * i + REVENT_OFFSET; 86 pollArray.putShort(offset, (short)revent); 87 } 88 putDescriptor(int i, int fd)89 void putDescriptor(int i, int fd) { 90 int offset = SIZE_POLLFD * i + FD_OFFSET; 91 pollArray.putInt(offset, fd); 92 } 93 94 } 95