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 package sun.nio.ch;
26
27 import java.io.IOException;
28 import static sun.nio.ch.KQueue.*;
29
30 /**
31 * Poller implementation based on the kqueue facility.
32 */
33 class KQueuePoller extends Poller {
34 private final int kqfd;
35 private final int filter;
36 private final int maxEvents;
37 private final long address;
38
39 KQueuePoller(boolean subPoller, boolean read) throws IOException {
40 this.kqfd = KQueue.create();
41 this.filter = (read) ? EVFILT_READ : EVFILT_WRITE;
42 this.maxEvents = (subPoller) ? 64 : 512;
43 this.address = KQueue.allocatePollArray(maxEvents);
44 }
45
46 @Override
47 int fdVal() {
48 return kqfd;
49 }
50
51 @Override
52 void implRegister(int fdVal) throws IOException {
53 int err = KQueue.register(kqfd, fdVal, filter, (EV_ADD|EV_ONESHOT));
54 if (err != 0)
55 throw new IOException("kevent failed: " + err);
56 }
57
58 @Override
59 void implDeregister(int fdVal, boolean polled) {
60 // event was deleted if already polled
61 if (!polled) {
62 KQueue.register(kqfd, fdVal, filter, EV_DELETE);
63 }
64 }
65
66 @Override
67 int poll(int timeout) throws IOException {
68 int n = KQueue.poll(kqfd, address, maxEvents, timeout);
69 int i = 0;
70 while (i < n) {
71 long keventAddress = KQueue.getEvent(address, i);
72 int fdVal = KQueue.getDescriptor(keventAddress);
73 polled(fdVal);
74 i++;
75 }
76 return n;
77 }
78 }
|
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 package sun.nio.ch;
26
27 import java.io.IOException;
28 import java.lang.ref.Cleaner.Cleanable;
29 import jdk.internal.ref.CleanerFactory;
30 import static sun.nio.ch.KQueue.*;
31
32 /**
33 * Poller implementation based on the kqueue facility.
34 */
35 class KQueuePoller extends Poller {
36 private final int kqfd;
37 private final int filter;
38 private final int maxEvents;
39 private final long address;
40
41 // file descriptors used for wakeup during shutdown
42 private final int fd0;
43 private final int fd1;
44
45 // close action, and cleaner if this is subpoller
46 private final Runnable closer;
47 private final Cleanable cleaner;
48
49 KQueuePoller(Poller.Mode mode, boolean subPoller, boolean read) throws IOException {
50 boolean wakeable = (mode == Mode.POLLER_PER_CARRIER) && subPoller;
51 int maxEvents = (subPoller) ? 16 : 64;
52
53 int kqfd = KQueue.create();
54 long address = 0L;
55 int fd0 = -1;
56 int fd1 = -1;
57 try {
58 address = KQueue.allocatePollArray(maxEvents);
59
60 // register one end of the pipe with kqueue to allow for wakeup
61 if (wakeable) {
62 long fds = IOUtil.makePipe(false);
63 fd0 = (int) (fds >>> 32);
64 fd1 = (int) fds;
65 KQueue.register(kqfd, fd0, EVFILT_READ, EV_ADD);
66 }
67 } catch (Throwable e) {
68 FileDispatcherImpl.closeIntFD(kqfd);
69 if (address != 0L) KQueue.freePollArray(address);
70 if (fd0 >= 0) FileDispatcherImpl.closeIntFD(fd0);
71 if (fd1 >= 0) FileDispatcherImpl.closeIntFD(fd1);
72 throw e;
73 }
74
75 this.kqfd = kqfd;
76 this.filter = (read) ? EVFILT_READ : EVFILT_WRITE;
77 this.maxEvents = maxEvents;
78 this.address = address;
79 this.fd0 = fd0;
80 this.fd1 = fd1;
81
82 // create action to close kqueue, register cleaner when wakeable
83 this.closer = closer(kqfd, address, fd0, fd1);
84 if (wakeable) {
85 this.cleaner = CleanerFactory.cleaner().register(this, closer);
86 } else {
87 this.cleaner = null;
88 }
89 }
90
91 /**
92 * Returns an action to close the kqueue and release other resources.
93 */
94 private static Runnable closer(int kqfd, long address, int fd0, int fd1) {
95 return () -> {
96 try {
97 FileDispatcherImpl.closeIntFD(kqfd);
98 KQueue.freePollArray(address);
99 if (fd0 >= 0) FileDispatcherImpl.closeIntFD(fd0);
100 if (fd1 >= 0) FileDispatcherImpl.closeIntFD(fd1);
101 } catch (IOException _) { }
102 };
103 }
104
105 @Override
106 void close() {
107 if (cleaner != null) {
108 cleaner.clean();
109 } else {
110 closer.run();
111 }
112 }
113
114 @Override
115 int fdVal() {
116 return kqfd;
117 }
118
119 @Override
120 void implStartPoll(int fdVal) throws IOException {
121 int err = KQueue.register(kqfd, fdVal, filter, (EV_ADD|EV_ONESHOT));
122 if (err != 0)
123 throw new IOException("kevent failed: " + err);
124 }
125
126 @Override
127 void implStopPoll(int fdVal, boolean polled) {
128 // event was deleted if already polled
129 if (!polled) {
130 KQueue.register(kqfd, fdVal, filter, EV_DELETE);
131 }
132 }
133
134 @Override
135 void wakeupPoller() throws IOException {
136 if (fd1 < 0) {
137 throw new UnsupportedOperationException();
138 }
139 IOUtil.write1(fd1, (byte)0);
140 }
141
142 @Override
143 int poll(int timeout) throws IOException {
144 int n = KQueue.poll(kqfd, address, maxEvents, timeout);
145 int polled = 0;
146 int i = 0;
147 while (i < n) {
148 long keventAddress = KQueue.getEvent(address, i);
149 int fdVal = KQueue.getDescriptor(keventAddress);
150 if (fdVal != fd0) {
151 polled(fdVal);
152 polled++;
153 }
154 i++;
155 }
156 return polled;
157 }
158 }
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