| /* |
| * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.nio.channels.ClosedSelectorException; |
| import java.nio.channels.SelectionKey; |
| import java.nio.channels.Selector; |
| import java.nio.channels.spi.SelectorProvider; |
| import java.util.ArrayDeque; |
| import java.util.Deque; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Consumer; |
| |
| import static sun.nio.ch.SolarisEventPort.PORT_SOURCE_FD; |
| import static sun.nio.ch.SolarisEventPort.PORT_SOURCE_USER; |
| import static sun.nio.ch.SolarisEventPort.SIZEOF_PORT_EVENT; |
| import static sun.nio.ch.SolarisEventPort.OFFSETOF_EVENTS; |
| import static sun.nio.ch.SolarisEventPort.OFFSETOF_SOURCE; |
| import static sun.nio.ch.SolarisEventPort.OFFSETOF_OBJECT; |
| import static sun.nio.ch.SolarisEventPort.port_create; |
| import static sun.nio.ch.SolarisEventPort.port_close; |
| import static sun.nio.ch.SolarisEventPort.port_associate; |
| import static sun.nio.ch.SolarisEventPort.port_dissociate; |
| import static sun.nio.ch.SolarisEventPort.port_getn; |
| import static sun.nio.ch.SolarisEventPort.port_send; |
| |
| /** |
| * Selector implementation based on the Solaris event port mechanism. |
| */ |
| |
| class EventPortSelectorImpl |
| extends SelectorImpl |
| { |
| // maximum number of events to retrive in one call to port_getn |
| static final int MAX_EVENTS = Math.min(IOUtil.fdLimit()-1, 1024); |
| |
| // port file descriptor |
| private final int pfd; |
| |
| // the poll array (populated by port_getn) |
| private final long pollArrayAddress; |
| private final AllocatedNativeObject pollArray; |
| |
| // maps file descriptor to selection key, synchronize on selector |
| private final Map<Integer, SelectionKeyImpl> fdToKey = new HashMap<>(); |
| |
| // the last update operation, incremented by processUpdateQueue |
| private int lastUpdate; |
| |
| // pending new registrations/updates, queued by setEventOps and |
| // updateSelectedKeys |
| private final Object updateLock = new Object(); |
| private final Deque<SelectionKeyImpl> updateKeys = new ArrayDeque<>(); |
| |
| // interrupt triggering and clearing |
| private final Object interruptLock = new Object(); |
| private boolean interruptTriggered; |
| |
| EventPortSelectorImpl(SelectorProvider sp) throws IOException { |
| super(sp); |
| |
| this.pfd = port_create(); |
| |
| int allocationSize = MAX_EVENTS * SIZEOF_PORT_EVENT; |
| this.pollArray = new AllocatedNativeObject(allocationSize, false); |
| this.pollArrayAddress = pollArray.address(); |
| } |
| |
| private void ensureOpen() { |
| if (!isOpen()) |
| throw new ClosedSelectorException(); |
| } |
| |
| @Override |
| protected int doSelect(Consumer<SelectionKey> action, long timeout) |
| throws IOException |
| { |
| assert Thread.holdsLock(this); |
| |
| long to = timeout; |
| boolean blocking = (to != 0); |
| boolean timedPoll = (to > 0); |
| |
| int numEvents; |
| processUpdateQueue(); |
| processDeregisterQueue(); |
| try { |
| begin(blocking); |
| |
| do { |
| long startTime = timedPoll ? System.nanoTime() : 0; |
| numEvents = port_getn(pfd, pollArrayAddress, MAX_EVENTS, to); |
| if (numEvents == IOStatus.INTERRUPTED && timedPoll) { |
| // timed poll interrupted so need to adjust timeout |
| long adjust = System.nanoTime() - startTime; |
| to -= TimeUnit.MILLISECONDS.convert(adjust, TimeUnit.NANOSECONDS); |
| if (to <= 0) { |
| // timeout also expired so no retry |
| numEvents = 0; |
| } |
| } |
| } while (numEvents == IOStatus.INTERRUPTED); |
| assert IOStatus.check(numEvents); |
| |
| } finally { |
| end(blocking); |
| } |
| processDeregisterQueue(); |
| return processPortEvents(numEvents, action); |
| } |
| |
| /** |
| * Process new registrations and changes to the interest ops. |
| */ |
| private void processUpdateQueue() throws IOException { |
| assert Thread.holdsLock(this); |
| |
| // bump lastUpdate to ensure that the interest ops are changed at most |
| // once per bulk update |
| lastUpdate++; |
| |
| synchronized (updateLock) { |
| SelectionKeyImpl ski; |
| while ((ski = updateKeys.pollFirst()) != null) { |
| if (ski.isValid()) { |
| int fd = ski.getFDVal(); |
| // add to fdToKey if needed |
| SelectionKeyImpl previous = fdToKey.putIfAbsent(fd, ski); |
| assert (previous == null) || (previous == ski); |
| |
| int newEvents = ski.translateInterestOps(); |
| if (newEvents != ski.registeredEvents()) { |
| if (newEvents == 0) { |
| port_dissociate(pfd, PORT_SOURCE_FD, fd); |
| } else { |
| port_associate(pfd, PORT_SOURCE_FD, fd, newEvents); |
| } |
| ski.registeredEvents(newEvents); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Process the polled events and re-queue the selected keys so the file |
| * descriptors are re-associated at the next select operation. |
| */ |
| private int processPortEvents(int numEvents, Consumer<SelectionKey> action) |
| throws IOException |
| { |
| assert Thread.holdsLock(this); |
| |
| int numKeysUpdated = 0; |
| boolean interrupted = false; |
| |
| // Process the polled events while holding the update lock. This allows |
| // keys to be queued for ready file descriptors so they can be |
| // re-associated at the next select. The selected-key can be updated |
| // in this pass. |
| synchronized (updateLock) { |
| for (int i = 0; i < numEvents; i++) { |
| short source = getSource(i); |
| if (source == PORT_SOURCE_FD) { |
| int fd = getDescriptor(i); |
| SelectionKeyImpl ski = fdToKey.get(fd); |
| if (ski != null) { |
| ski.registeredEvents(0); |
| updateKeys.addLast(ski); |
| |
| // update selected-key set if no action specified |
| if (action == null) { |
| int rOps = getEventOps(i); |
| numKeysUpdated += processReadyEvents(rOps, ski, null); |
| } |
| |
| } |
| } else if (source == PORT_SOURCE_USER) { |
| interrupted = true; |
| } else { |
| assert false; |
| } |
| } |
| } |
| |
| // if an action specified then iterate over the polled events again so |
| // that the action is performed without holding the update lock. |
| if (action != null) { |
| for (int i = 0; i < numEvents; i++) { |
| short source = getSource(i); |
| if (source == PORT_SOURCE_FD) { |
| int fd = getDescriptor(i); |
| SelectionKeyImpl ski = fdToKey.get(fd); |
| if (ski != null) { |
| int rOps = getEventOps(i); |
| numKeysUpdated += processReadyEvents(rOps, ski, action); |
| } |
| } |
| } |
| } |
| |
| if (interrupted) { |
| clearInterrupt(); |
| } |
| return numKeysUpdated; |
| } |
| |
| @Override |
| protected void implClose() throws IOException { |
| assert !isOpen(); |
| assert Thread.holdsLock(this); |
| |
| // prevent further wakeup |
| synchronized (interruptLock) { |
| interruptTriggered = true; |
| } |
| |
| port_close(pfd); |
| pollArray.free(); |
| } |
| |
| @Override |
| protected void implDereg(SelectionKeyImpl ski) throws IOException { |
| assert !ski.isValid(); |
| assert Thread.holdsLock(this); |
| |
| int fd = ski.getFDVal(); |
| if (fdToKey.remove(fd) != null) { |
| if (ski.registeredEvents() != 0) { |
| port_dissociate(pfd, PORT_SOURCE_FD, fd); |
| ski.registeredEvents(0); |
| } |
| } else { |
| assert ski.registeredEvents() == 0; |
| } |
| } |
| |
| @Override |
| public void setEventOps(SelectionKeyImpl ski) { |
| ensureOpen(); |
| synchronized (updateLock) { |
| updateKeys.addLast(ski); |
| } |
| } |
| |
| @Override |
| public Selector wakeup() { |
| synchronized (interruptLock) { |
| if (!interruptTriggered) { |
| try { |
| port_send(pfd, 0); |
| } catch (IOException ioe) { |
| throw new InternalError(ioe); |
| } |
| interruptTriggered = true; |
| } |
| } |
| return this; |
| } |
| |
| private void clearInterrupt() throws IOException { |
| synchronized (interruptLock) { |
| interruptTriggered = false; |
| } |
| } |
| |
| private short getSource(int i) { |
| int offset = SIZEOF_PORT_EVENT * i + OFFSETOF_SOURCE; |
| return pollArray.getShort(offset); |
| } |
| |
| private int getEventOps(int i) { |
| int offset = SIZEOF_PORT_EVENT * i + OFFSETOF_EVENTS; |
| return pollArray.getInt(offset); |
| } |
| |
| private int getDescriptor(int i) { |
| //assert Unsafe.getUnsafe().addressSize() == 8; |
| int offset = SIZEOF_PORT_EVENT * i + OFFSETOF_OBJECT; |
| return (int) pollArray.getLong(offset); |
| } |
| } |