1 /*
2 * Copyright (c) 2001, 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
23 * 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
33
34 /**
35 * An implementation of Selector for Solaris.
36 */
37 class DevPollSelectorImpl
38 extends SelectorImpl
39 {
40
41 // File descriptors used for interrupt
42 protected int fd0;
43 protected int fd1;
44
45 // The poll object
46 final DevPollArrayWrapper pollWrapper;
47
48 // Maps from file descriptors to keys
49 private final Map<Integer,SelectionKeyImpl> fdToKey;
50
51 // True if this Selector has been closed
52 private boolean closed = false;
53
54 // Lock for interrupt triggering and clearing
55 private final Object interruptLock = new Object();
56 private boolean interruptTriggered = false;
57
58 /**
59 * Package private constructor called by factory method in
60 * the abstract superclass Selector.
61 */
62 DevPollSelectorImpl(SelectorProvider sp) {
63 super(sp);
64 long pipeFds = IOUtil.makePipe(false);
65 fd0 = (int) (pipeFds >>> 32);
66 fd1 = (int) pipeFds;
67 try {
68 pollWrapper = new DevPollArrayWrapper();
69 pollWrapper.initInterrupt(fd0, fd1);
70 fdToKey = new HashMap<>();
71 } catch (Throwable t) {
72 try {
73 FileDispatcherImpl.closeIntFD(fd0);
74 } catch (IOException ioe0) {
75 t.addSuppressed(ioe0);
76 }
77 try {
78 FileDispatcherImpl.closeIntFD(fd1);
79 } catch (IOException ioe1) {
80 t.addSuppressed(ioe1);
81 }
82 throw t;
83 }
84 }
85
86 protected int doSelect(long timeout)
87 throws IOException
88 {
89 if (closed)
90 throw new ClosedSelectorException();
91 processDeregisterQueue();
92 try {
93 begin();
94 pollWrapper.poll(timeout);
95 } finally {
96 end();
97 }
98 processDeregisterQueue();
99 int numKeysUpdated = updateSelectedKeys();
100 if (pollWrapper.interrupted()) {
101 // Clear the wakeup pipe
102 pollWrapper.putReventOps(pollWrapper.interruptedIndex(), 0);
103 synchronized (interruptLock) {
104 pollWrapper.clearInterrupted();
105 IOUtil.drain(fd0);
106 interruptTriggered = false;
107 }
108 }
109 return numKeysUpdated;
110 }
111
112 /**
113 * Update the keys whose fd's have been selected by the devpoll
114 * driver. Add the ready keys to the ready queue.
115 */
116 private int updateSelectedKeys() {
117 int entries = pollWrapper.updated;
118 int numKeysUpdated = 0;
119 for (int i=0; i<entries; i++) {
120 int nextFD = pollWrapper.getDescriptor(i);
121 SelectionKeyImpl ski = fdToKey.get(Integer.valueOf(nextFD));
122 // ski is null in the case of an interrupt
123 if (ski != null) {
124 int rOps = pollWrapper.getReventOps(i);
125 if (selectedKeys.contains(ski)) {
126 if (ski.channel.translateAndSetReadyOps(rOps, ski)) {
127 numKeysUpdated++;
128 }
129 } else {
130 ski.channel.translateAndSetReadyOps(rOps, ski);
131 if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) {
132 selectedKeys.add(ski);
133 numKeysUpdated++;
134 }
135 }
136 }
137 }
138 return numKeysUpdated;
139 }
140
141 protected void implClose() throws IOException {
142 if (closed)
143 return;
144 closed = true;
145
146 // prevent further wakeup
147 synchronized (interruptLock) {
148 interruptTriggered = true;
149 }
150
151 FileDispatcherImpl.closeIntFD(fd0);
152 FileDispatcherImpl.closeIntFD(fd1);
153
154 pollWrapper.release(fd0);
155 pollWrapper.closeDevPollFD();
156 selectedKeys.clear();
157
158 // Deregister channels
159 Iterator<SelectionKey> i = keys.iterator();
160 while (i.hasNext()) {
161 SelectionKeyImpl ski = (SelectionKeyImpl)i.next();
162 deregister(ski);
163 SelectableChannel selch = ski.channel();
164 if (!selch.isOpen() && !selch.isRegistered())
165 ((SelChImpl)selch).kill();
166 i.remove();
167 }
168 fd0 = -1;
169 fd1 = -1;
170 }
171
172 protected void implRegister(SelectionKeyImpl ski) {
173 int fd = IOUtil.fdVal(ski.channel.getFD());
174 fdToKey.put(Integer.valueOf(fd), ski);
175 keys.add(ski);
176 }
177
178 protected void implDereg(SelectionKeyImpl ski) throws IOException {
179 int i = ski.getIndex();
180 assert (i >= 0);
181 int fd = ski.channel.getFDVal();
182 fdToKey.remove(Integer.valueOf(fd));
183 pollWrapper.release(fd);
184 ski.setIndex(-1);
185 keys.remove(ski);
186 selectedKeys.remove(ski);
187 deregister(ski);
188 SelectableChannel selch = ski.channel();
189 if (!selch.isOpen() && !selch.isRegistered())
190 ((SelChImpl)selch).kill();
191 }
192
193 public void putEventOps(SelectionKeyImpl sk, int ops) {
194 if (closed)
195 throw new ClosedSelectorException();
196 int fd = IOUtil.fdVal(sk.channel.getFD());
197 pollWrapper.setInterest(fd, ops);
198 }
199
200 public Selector wakeup() {
201 synchronized (interruptLock) {
202 if (!interruptTriggered) {
203 pollWrapper.interrupt();
204 interruptTriggered = true;
205 }
206 }
207 return this;
208 }
209 }