1 /*
2 * Copyright (c) 2008, 2013, 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
165 wakeup();
166 }
167 }
168 }
169
170 // invoke by clients to register a file descriptor
171 @Override
172 void startPoll(int fd, int events) {
173 // update events (or add to epoll on first usage)
174 int err = epollCtl(epfd, EPOLL_CTL_MOD, fd, (events | EPOLLONESHOT));
175 if (err == ENOENT)
176 err = epollCtl(epfd, EPOLL_CTL_ADD, fd, (events | EPOLLONESHOT));
177 if (err != 0)
178 throw new AssertionError(); // should not happen
179 }
180
181 /*
182 * Task to process events from epoll and dispatch to the channel's
183 * onEvent handler.
184 *
185 * Events are retreived from epoll in batch and offered to a BlockingQueue
186 * where they are consumed by handler threads. A special "NEED_TO_POLL"
187 * event is used to signal one consumer to re-poll when all events have
188 * been consumed.
189 */
190 private class EventHandlerTask implements Runnable {
191 private Event poll() throws IOException {
192 try {
193 for (;;) {
194 int n = epollWait(epfd, address, MAX_EPOLL_EVENTS);
195 /*
196 * 'n' events have been read. Here we map them to their
197 * corresponding channel in batch and queue n-1 so that
198 * they can be handled by other handler threads. The last
199 * event is handled by this thread (and so is not queued).
200 */
201 fdToChannelLock.readLock().lock();
202 try {
203 while (n-- > 0) {
204 long eventAddress = getEvent(address, n);
205 int fd = getDescriptor(eventAddress);
|
1 /*
2 * Copyright (c) 2008, 2018, 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
165 wakeup();
166 }
167 }
168 }
169
170 // invoke by clients to register a file descriptor
171 @Override
172 void startPoll(int fd, int events) {
173 // update events (or add to epoll on first usage)
174 int err = epollCtl(epfd, EPOLL_CTL_MOD, fd, (events | EPOLLONESHOT));
175 if (err == ENOENT)
176 err = epollCtl(epfd, EPOLL_CTL_ADD, fd, (events | EPOLLONESHOT));
177 if (err != 0)
178 throw new AssertionError(); // should not happen
179 }
180
181 /*
182 * Task to process events from epoll and dispatch to the channel's
183 * onEvent handler.
184 *
185 * Events are retrieved from epoll in batch and offered to a BlockingQueue
186 * where they are consumed by handler threads. A special "NEED_TO_POLL"
187 * event is used to signal one consumer to re-poll when all events have
188 * been consumed.
189 */
190 private class EventHandlerTask implements Runnable {
191 private Event poll() throws IOException {
192 try {
193 for (;;) {
194 int n = epollWait(epfd, address, MAX_EPOLL_EVENTS);
195 /*
196 * 'n' events have been read. Here we map them to their
197 * corresponding channel in batch and queue n-1 so that
198 * they can be handled by other handler threads. The last
199 * event is handled by this thread (and so is not queued).
200 */
201 fdToChannelLock.readLock().lock();
202 try {
203 while (n-- > 0) {
204 long eventAddress = getEvent(address, n);
205 int fd = getDescriptor(eventAddress);
|