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311 lines
11 KiB
Java
311 lines
11 KiB
Java
/*
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* Copyright (c) 2011, 2018, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* 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.ClosedSelectorException;
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import java.nio.channels.Selector;
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import java.nio.channels.spi.SelectorProvider;
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import java.util.ArrayDeque;
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import java.util.Deque;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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import static sun.nio.ch.KQueue.EVFILT_READ;
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import static sun.nio.ch.KQueue.EVFILT_WRITE;
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import static sun.nio.ch.KQueue.EV_ADD;
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import static sun.nio.ch.KQueue.EV_DELETE;
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/**
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* KQueue based Selector implementation for macOS
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*/
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class KQueueSelectorImpl extends SelectorImpl {
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// maximum number of events to poll in one call to kqueue
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private static final int MAX_KEVENTS = 256;
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// kqueue file descriptor
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private final int kqfd;
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// address of poll array (event list) when polling for pending events
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private final long pollArrayAddress;
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// file descriptors used for interrupt
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private final int fd0;
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private final int fd1;
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// maps file descriptor to selection key, synchronize on selector
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private final Map<Integer, SelectionKeyImpl> fdToKey = new HashMap<>();
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// pending new registrations/updates, queued by setEventOps
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private final Object updateLock = new Object();
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private final Deque<SelectionKeyImpl> updateKeys = new ArrayDeque<>();
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// interrupt triggering and clearing
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private final Object interruptLock = new Object();
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private boolean interruptTriggered;
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// used by updateSelectedKeys to handle cases where the same file
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// descriptor is polled by more than one filter
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private int pollCount;
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KQueueSelectorImpl(SelectorProvider sp) throws IOException {
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super(sp);
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this.kqfd = KQueue.create();
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this.pollArrayAddress = KQueue.allocatePollArray(MAX_KEVENTS);
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try {
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long fds = IOUtil.makePipe(false);
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this.fd0 = (int) (fds >>> 32);
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this.fd1 = (int) fds;
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} catch (IOException ioe) {
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KQueue.freePollArray(pollArrayAddress);
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FileDispatcherImpl.closeIntFD(kqfd);
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throw ioe;
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}
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// register one end of the socket pair for wakeups
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KQueue.register(kqfd, fd0, EVFILT_READ, EV_ADD);
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}
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private void ensureOpen() {
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if (!isOpen())
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throw new ClosedSelectorException();
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}
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@Override
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protected int doSelect(long timeout) throws IOException {
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assert Thread.holdsLock(this);
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long to = Math.min(timeout, Integer.MAX_VALUE); // max kqueue timeout
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boolean blocking = (to != 0);
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boolean timedPoll = (to > 0);
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int numEntries;
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processUpdateQueue();
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processDeregisterQueue();
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try {
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begin(blocking);
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do {
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long startTime = timedPoll ? System.nanoTime() : 0;
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numEntries = KQueue.poll(kqfd, pollArrayAddress, MAX_KEVENTS, to);
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if (numEntries == IOStatus.INTERRUPTED && timedPoll) {
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// timed poll interrupted so need to adjust timeout
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long adjust = System.nanoTime() - startTime;
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to -= TimeUnit.MILLISECONDS.convert(adjust, TimeUnit.NANOSECONDS);
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if (to <= 0) {
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// timeout expired so no retry
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numEntries = 0;
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}
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}
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} while (numEntries == IOStatus.INTERRUPTED);
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assert IOStatus.check(numEntries);
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} finally {
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end(blocking);
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}
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processDeregisterQueue();
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return updateSelectedKeys(numEntries);
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}
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/**
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* Process changes to the interest ops.
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*/
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private void processUpdateQueue() {
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assert Thread.holdsLock(this);
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synchronized (updateLock) {
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SelectionKeyImpl ski;
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while ((ski = updateKeys.pollFirst()) != null) {
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if (ski.isValid()) {
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int fd = ski.getFDVal();
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// add to fdToKey if needed
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SelectionKeyImpl previous = fdToKey.putIfAbsent(fd, ski);
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assert (previous == null) || (previous == ski);
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int newEvents = ski.translateInterestOps();
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int registeredEvents = ski.registeredEvents();
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if (newEvents != registeredEvents) {
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// add or delete interest in read events
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if ((registeredEvents & Net.POLLIN) != 0) {
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if ((newEvents & Net.POLLIN) == 0) {
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KQueue.register(kqfd, fd, EVFILT_READ, EV_DELETE);
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}
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} else if ((newEvents & Net.POLLIN) != 0) {
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KQueue.register(kqfd, fd, EVFILT_READ, EV_ADD);
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}
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// add or delete interest in write events
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if ((registeredEvents & Net.POLLOUT) != 0) {
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if ((newEvents & Net.POLLOUT) == 0) {
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KQueue.register(kqfd, fd, EVFILT_WRITE, EV_DELETE);
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}
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} else if ((newEvents & Net.POLLOUT) != 0) {
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KQueue.register(kqfd, fd, EVFILT_WRITE, EV_ADD);
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}
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ski.registeredEvents(newEvents);
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}
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}
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}
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}
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}
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/**
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* Update the keys of file descriptors that were polled and add them to
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* the selected-key set.
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* If the interrupt fd has been selected, drain it and clear the interrupt.
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*/
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private int updateSelectedKeys(int numEntries) throws IOException {
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assert Thread.holdsLock(this);
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assert Thread.holdsLock(nioSelectedKeys());
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int numKeysUpdated = 0;
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boolean interrupted = false;
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// A file descriptor may be registered with kqueue with more than one
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// filter and so there may be more than one event for a fd. The poll
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// count is incremented here and compared against the SelectionKey's
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// "lastPolled" field. This ensures that the ready ops is updated rather
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// than replaced when a file descriptor is polled by both the read and
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// write filter.
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pollCount++;
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for (int i = 0; i < numEntries; i++) {
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long kevent = KQueue.getEvent(pollArrayAddress, i);
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int fd = KQueue.getDescriptor(kevent);
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if (fd == fd0) {
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interrupted = true;
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} else {
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SelectionKeyImpl ski = fdToKey.get(fd);
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if (ski != null) {
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int rOps = 0;
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short filter = KQueue.getFilter(kevent);
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if (filter == EVFILT_READ) {
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rOps |= Net.POLLIN;
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} else if (filter == EVFILT_WRITE) {
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rOps |= Net.POLLOUT;
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}
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if (selectedKeys.contains(ski)) {
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if (ski.translateAndUpdateReadyOps(rOps)) {
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// file descriptor may be polled more than once per poll
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if (ski.lastPolled != pollCount) {
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numKeysUpdated++;
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ski.lastPolled = pollCount;
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}
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}
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} else {
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ski.translateAndSetReadyOps(rOps);
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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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ski.lastPolled = pollCount;
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}
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}
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}
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}
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}
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if (interrupted) {
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clearInterrupt();
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}
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return numKeysUpdated;
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}
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@Override
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protected void implClose() throws IOException {
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assert !isOpen();
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assert Thread.holdsLock(this);
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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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FileDispatcherImpl.closeIntFD(kqfd);
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KQueue.freePollArray(pollArrayAddress);
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FileDispatcherImpl.closeIntFD(fd0);
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FileDispatcherImpl.closeIntFD(fd1);
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}
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@Override
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protected void implDereg(SelectionKeyImpl ski) throws IOException {
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assert !ski.isValid();
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assert Thread.holdsLock(this);
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int fd = ski.getFDVal();
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int registeredEvents = ski.registeredEvents();
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if (fdToKey.remove(fd) != null) {
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if (registeredEvents != 0) {
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if ((registeredEvents & Net.POLLIN) != 0)
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KQueue.register(kqfd, fd, EVFILT_READ, EV_DELETE);
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if ((registeredEvents & Net.POLLOUT) != 0)
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KQueue.register(kqfd, fd, EVFILT_WRITE, EV_DELETE);
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ski.registeredEvents(0);
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}
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} else {
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assert registeredEvents == 0;
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}
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}
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@Override
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public void setEventOps(SelectionKeyImpl ski) {
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ensureOpen();
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synchronized (updateLock) {
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updateKeys.addLast(ski);
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}
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}
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@Override
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public Selector wakeup() {
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synchronized (interruptLock) {
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if (!interruptTriggered) {
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try {
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IOUtil.write1(fd1, (byte)0);
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} catch (IOException ioe) {
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throw new InternalError(ioe);
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}
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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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private void clearInterrupt() throws IOException {
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synchronized (interruptLock) {
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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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}
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