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.EPoll.*;
29
30 /**
31 * Poller implementation based on the epoll facility.
32 */
33
34 class EPollPoller extends Poller {
35 private static final int ENOENT = 2;
36
37 private final int epfd;
38 private final int event;
39 private final int maxEvents;
40 private final long address;
41
42 EPollPoller(boolean subPoller, boolean read) throws IOException {
43 this.epfd = EPoll.create();
44 this.event = (read) ? EPOLLIN : EPOLLOUT;
45 this.maxEvents = (subPoller) ? 64 : 512;
46 this.address = EPoll.allocatePollArray(maxEvents);
47 }
48
49 @Override
50 int fdVal() {
51 return epfd;
52 }
53
54 @Override
55 void implRegister(int fdVal) throws IOException {
56 // re-arm
57 int err = EPoll.ctl(epfd, EPOLL_CTL_MOD, fdVal, (event | EPOLLONESHOT));
58 if (err == ENOENT)
59 err = EPoll.ctl(epfd, EPOLL_CTL_ADD, fdVal, (event | EPOLLONESHOT));
60 if (err != 0)
61 throw new IOException("epoll_ctl failed: " + err);
62 }
63
64 @Override
65 void implDeregister(int fdVal, boolean polled) {
66 // event is disabled if already polled
67 if (!polled) {
68 EPoll.ctl(epfd, EPOLL_CTL_DEL, fdVal, 0);
69 }
70 }
71
72 @Override
73 int poll(int timeout) throws IOException {
74 int n = EPoll.wait(epfd, address, maxEvents, timeout);
75 int i = 0;
76 while (i < n) {
77 long eventAddress = EPoll.getEvent(address, i);
78 int fdVal = EPoll.getDescriptor(eventAddress);
79 polled(fdVal);
80 i++;
81 }
82 return n;
83 }
84 }
85
|
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.EPoll.*;
31
32 /**
33 * Poller implementation based on the epoll facility.
34 */
35
36 class EPollPoller extends Poller {
37 private static final int ENOENT = 2;
38
39 private final int epfd;
40 private final int event;
41 private final int maxEvents;
42 private final long address;
43 private final EventFD eventfd; // wakeup event, used for shutdown
44 private final Cleanable cleaner;
45
46 EPollPoller(boolean subPoller, boolean read) throws IOException {
47 int maxEvents = (subPoller) ? 16 : 64;
48
49 int epfd = -1;
50 long address = 0L;
51 EventFD eventfd = null;
52 try {
53 epfd = EPoll.create();
54 address = EPoll.allocatePollArray(maxEvents);
55
56 // register event with epoll to allow for wakeup
57 eventfd = new EventFD();
58 IOUtil.configureBlocking(eventfd.efd(), false);
59 EPoll.ctl(epfd, EPOLL_CTL_ADD, eventfd.efd(), EPOLLIN);
60 } catch (Throwable e) {
61 if (epfd >= 0) FileDispatcherImpl.closeIntFD(epfd);
62 if (address != 0L) EPoll.freePollArray(address);
63 if (eventfd != null) eventfd.close();
64 throw e;
65 }
66
67 this.epfd = epfd;
68 this.event = (read) ? EPOLLIN : EPOLLOUT;
69 this.maxEvents = maxEvents;
70 this.address = address;
71 this.eventfd = eventfd;
72
73 this.cleaner = CleanerFactory.cleaner()
74 .register(this, releaser(epfd, address, eventfd));
75 }
76
77 /**
78 * Releases the epoll instance and other resources.
79 */
80 private static Runnable releaser(int epfd, long address, EventFD eventfd) {
81 return () -> {
82 try {
83 FileDispatcherImpl.closeIntFD(epfd);
84 EPoll.freePollArray(address);
85 eventfd.close();
86 } catch (IOException _) { }
87 };
88 }
89
90 @Override
91 void close() {
92 cleaner.clean();
93 }
94
95 @Override
96 int fdVal() {
97 return epfd;
98 }
99
100 @Override
101 void implRegister(int fdVal) throws IOException {
102 // re-enable if already registered but disabled (previously polled)
103 int err = EPoll.ctl(epfd, EPOLL_CTL_MOD, fdVal, (event | EPOLLONESHOT));
104 if (err == ENOENT)
105 err = EPoll.ctl(epfd, EPOLL_CTL_ADD, fdVal, (event | EPOLLONESHOT));
106 if (err != 0)
107 throw new IOException("epoll_ctl failed: " + err);
108 }
109
110 @Override
111 void implDeregister(int fdVal, boolean polled) {
112 // event is disabled if already polled
113 if (!polled) {
114 EPoll.ctl(epfd, EPOLL_CTL_DEL, fdVal, 0);
115 }
116 }
117
118 @Override
119 void wakeupPoller() throws IOException {
120 eventfd.set();
121 }
122
123 @Override
124 int poll(int timeout) throws IOException {
125 int n = EPoll.wait(epfd, address, maxEvents, timeout);
126 int polled = 0;
127 int i = 0;
128 while (i < n) {
129 long eventAddress = EPoll.getEvent(address, i);
130 int fd = EPoll.getDescriptor(eventAddress);
131 if (fd != eventfd.efd()) {
132 polled(fd);
133 polled++;
134 }
135 i++;
136 }
137 return polled;
138 }
139 }
140
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