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/*
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* Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.nio.ch;
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import java.io.IOException;
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import java.nio.channels.*;
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import java.nio.channels.spi.*;
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import java.util.*;
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import sun.misc.*;
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/**
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* An implementation of Selector for Linux 2.6+ kernels that uses
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* the epoll event notification facility.
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*/
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class EPollSelectorImpl
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extends SelectorImpl
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{
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// File descriptors used for interrupt
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protected int fd0;
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protected int fd1;
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// The poll object
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EPollArrayWrapper pollWrapper;
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// Maps from file descriptors to keys
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private HashMap fdToKey;
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// True if this Selector has been closed
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private boolean closed = false;
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// Lock for interrupt triggering and clearing
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private Object interruptLock = new Object();
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private boolean interruptTriggered = false;
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/**
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* Package private constructor called by factory method in
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* the abstract superclass Selector.
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*/
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EPollSelectorImpl(SelectorProvider sp) {
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super(sp);
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int[] fdes = new int[2];
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IOUtil.initPipe(fdes, false);
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fd0 = fdes[0];
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fd1 = fdes[1];
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pollWrapper = new EPollArrayWrapper();
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pollWrapper.initInterrupt(fd0, fd1);
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fdToKey = new HashMap();
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}
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protected int doSelect(long timeout)
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throws IOException
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{
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if (closed)
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throw new ClosedSelectorException();
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processDeregisterQueue();
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try {
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begin();
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pollWrapper.poll(timeout);
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} finally {
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end();
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}
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processDeregisterQueue();
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int numKeysUpdated = updateSelectedKeys();
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if (pollWrapper.interrupted()) {
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// Clear the wakeup pipe
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pollWrapper.putEventOps(pollWrapper.interruptedIndex(), 0);
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synchronized (interruptLock) {
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pollWrapper.clearInterrupted();
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IOUtil.drain(fd0);
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interruptTriggered = false;
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}
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}
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return numKeysUpdated;
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}
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/**
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* Update the keys whose fd's have been selected by the epoll.
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* Add the ready keys to the ready queue.
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*/
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private int updateSelectedKeys() {
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int entries = pollWrapper.updated;
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int numKeysUpdated = 0;
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for (int i=0; i<entries; i++) {
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int nextFD = pollWrapper.getDescriptor(i);
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SelectionKeyImpl ski = (SelectionKeyImpl) fdToKey.get(
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new Integer(nextFD));
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// ski is null in the case of an interrupt
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if (ski != null) {
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int rOps = pollWrapper.getEventOps(i);
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if (selectedKeys.contains(ski)) {
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if (ski.channel.translateAndSetReadyOps(rOps, ski)) {
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numKeysUpdated++;
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}
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} else {
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ski.channel.translateAndSetReadyOps(rOps, ski);
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if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) {
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selectedKeys.add(ski);
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numKeysUpdated++;
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}
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}
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}
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}
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return numKeysUpdated;
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}
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protected void implClose() throws IOException {
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if (!closed) {
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closed = true;
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// prevent further wakeup
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synchronized (interruptLock) {
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interruptTriggered = true;
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}
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FileDispatcher.closeIntFD(fd0);
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FileDispatcher.closeIntFD(fd1);
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if (pollWrapper != null) {
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pollWrapper.release(fd0);
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pollWrapper.closeEPollFD();
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pollWrapper = null;
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selectedKeys = null;
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// Deregister channels
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Iterator i = keys.iterator();
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while (i.hasNext()) {
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SelectionKeyImpl ski = (SelectionKeyImpl)i.next();
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deregister(ski);
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SelectableChannel selch = ski.channel();
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if (!selch.isOpen() && !selch.isRegistered())
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((SelChImpl)selch).kill();
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i.remove();
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}
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}
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fd0 = -1;
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fd1 = -1;
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}
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}
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protected void implRegister(SelectionKeyImpl ski) {
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int fd = IOUtil.fdVal(ski.channel.getFD());
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fdToKey.put(new Integer(fd), ski);
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pollWrapper.add(fd);
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keys.add(ski);
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}
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protected void implDereg(SelectionKeyImpl ski) throws IOException {
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assert (ski.getIndex() >= 0);
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int fd = ski.channel.getFDVal();
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fdToKey.remove(new Integer(fd));
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pollWrapper.release(fd);
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ski.setIndex(-1);
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keys.remove(ski);
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selectedKeys.remove(ski);
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deregister((AbstractSelectionKey)ski);
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SelectableChannel selch = ski.channel();
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if (!selch.isOpen() && !selch.isRegistered())
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((SelChImpl)selch).kill();
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}
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void putEventOps(SelectionKeyImpl sk, int ops) {
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int fd = IOUtil.fdVal(sk.channel.getFD());
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pollWrapper.setInterest(fd, ops);
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}
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public Selector wakeup() {
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synchronized (interruptLock) {
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if (!interruptTriggered) {
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pollWrapper.interrupt();
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interruptTriggered = true;
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}
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}
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return this;
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}
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static {
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Util.load();
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}
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}
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