J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.nio.ch; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import java.nio.channels.*; |
| 30 | import java.nio.channels.spi.*; |
| 31 | import java.util.*; |
| 32 | import sun.misc.*; |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * An implementation of Selector for Solaris. |
| 37 | */ |
| 38 | |
| 39 | class PollSelectorImpl |
| 40 | extends AbstractPollSelectorImpl |
| 41 | { |
| 42 | |
| 43 | // File descriptors used for interrupt |
| 44 | private int fd0; |
| 45 | private int fd1; |
| 46 | |
| 47 | // Lock for interrupt triggering and clearing |
| 48 | private Object interruptLock = new Object(); |
| 49 | private boolean interruptTriggered = false; |
| 50 | |
| 51 | /** |
| 52 | * Package private constructor called by factory method in |
| 53 | * the abstract superclass Selector. |
| 54 | */ |
| 55 | PollSelectorImpl(SelectorProvider sp) { |
| 56 | super(sp, 1, 1); |
| 57 | int[] fdes = new int[2]; |
| 58 | IOUtil.initPipe(fdes, false); |
| 59 | fd0 = fdes[0]; |
| 60 | fd1 = fdes[1]; |
| 61 | pollWrapper = new PollArrayWrapper(INIT_CAP); |
| 62 | pollWrapper.initInterrupt(fd0, fd1); |
| 63 | channelArray = new SelectionKeyImpl[INIT_CAP]; |
| 64 | } |
| 65 | |
| 66 | protected int doSelect(long timeout) |
| 67 | throws IOException |
| 68 | { |
| 69 | if (channelArray == null) |
| 70 | throw new ClosedSelectorException(); |
| 71 | processDeregisterQueue(); |
| 72 | try { |
| 73 | begin(); |
| 74 | pollWrapper.poll(totalChannels, 0, timeout); |
| 75 | } finally { |
| 76 | end(); |
| 77 | } |
| 78 | processDeregisterQueue(); |
| 79 | int numKeysUpdated = updateSelectedKeys(); |
| 80 | if (pollWrapper.getReventOps(0) != 0) { |
| 81 | // Clear the wakeup pipe |
| 82 | pollWrapper.putReventOps(0, 0); |
| 83 | synchronized (interruptLock) { |
| 84 | IOUtil.drain(fd0); |
| 85 | interruptTriggered = false; |
| 86 | } |
| 87 | } |
| 88 | return numKeysUpdated; |
| 89 | } |
| 90 | |
| 91 | protected void implCloseInterrupt() throws IOException { |
| 92 | // prevent further wakeup |
| 93 | synchronized (interruptLock) { |
| 94 | interruptTriggered = true; |
| 95 | } |
| 96 | FileDispatcher.closeIntFD(fd0); |
| 97 | FileDispatcher.closeIntFD(fd1); |
| 98 | fd0 = -1; |
| 99 | fd1 = -1; |
| 100 | pollWrapper.release(0); |
| 101 | } |
| 102 | |
| 103 | public Selector wakeup() { |
| 104 | synchronized (interruptLock) { |
| 105 | if (!interruptTriggered) { |
| 106 | pollWrapper.interrupt(); |
| 107 | interruptTriggered = true; |
| 108 | } |
| 109 | } |
| 110 | return this; |
| 111 | } |
| 112 | |
| 113 | } |