1 /*
2 * Copyright (c) 2018, 2023, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test id=default
26 * @bug 8284161
27 * @summary Test virtual threads doing blocking I/O on NIO channels
28 * @library /test/lib
29 * @run junit BlockingChannelOps
30 */
31
32 /**
33 * @test id=poller-modes
34 * @requires (os.family == "linux") | (os.family == "mac")
35 * @library /test/lib
36 * @run junit/othervm -Djdk.pollerMode=1 BlockingChannelOps
37 * @run junit/othervm -Djdk.pollerMode=2 BlockingChannelOps
38 */
39
40 /**
41 * @test id=no-vmcontinuations
42 * @requires vm.continuations
43 * @library /test/lib
44 * @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations BlockingChannelOps
45 */
46
47 import java.io.Closeable;
48 import java.io.IOException;
49 import java.net.DatagramPacket;
50 import java.net.InetAddress;
51 import java.net.InetSocketAddress;
52 import java.net.Socket;
53 import java.net.SocketAddress;
54 import java.net.SocketException;
55 import java.nio.ByteBuffer;
56 import java.nio.channels.AsynchronousCloseException;
57 import java.nio.channels.ClosedByInterruptException;
58 import java.nio.channels.ClosedChannelException;
59 import java.nio.channels.DatagramChannel;
60 import java.nio.channels.Pipe;
61 import java.nio.channels.ReadableByteChannel;
62 import java.nio.channels.ServerSocketChannel;
63 import java.nio.channels.SocketChannel;
64 import java.nio.channels.WritableByteChannel;
65 import java.util.concurrent.ExecutorService;
66 import java.util.concurrent.Executors;
67 import java.util.stream.Stream;
68
69 import jdk.test.lib.thread.VThreadRunner;
70 import jdk.test.lib.thread.VThreadScheduler;
71
72 import org.junit.jupiter.api.BeforeAll;
73 import org.junit.jupiter.api.AfterAll;
74 import org.junit.jupiter.params.ParameterizedTest;
75 import org.junit.jupiter.params.provider.MethodSource;
76 import static org.junit.jupiter.api.Assertions.*;
77
78 class BlockingChannelOps {
79
80 private static ExecutorService customScheduler;
81
82 @BeforeAll
83 static void setup() {
84 customScheduler = Executors.newCachedThreadPool();
85 }
86
87 @AfterAll
88 static void finish() {
89 customScheduler.shutdown();
90 }
91
92 /**
93 * Returns the Thread.Builder to create the virtual thread.
94 */
95 static Stream<Thread.Builder.OfVirtual> threadBuilders() {
96 if (VThreadScheduler.supportsCustomScheduler()) {
97 return Stream.of(Thread.ofVirtual(), Thread.ofVirtual().scheduler(customScheduler));
98 } else {
99 return Stream.of(Thread.ofVirtual());
100 }
101 }
102
103 /**
104 * SocketChannel read/write, no blocking.
105 */
106 @ParameterizedTest
107 @MethodSource("threadBuilders")
108 void testSocketChannelReadWrite1(Thread.Builder.OfVirtual builder) throws Exception {
109 VThreadRunner.run(builder, () -> {
110 try (var connection = new Connection()) {
111 SocketChannel sc1 = connection.channel1();
112 SocketChannel sc2 = connection.channel2();
113
114 // write to sc1
115 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
116 int n = sc1.write(bb);
117 assertTrue(n > 0);
118
119 // read from sc2 should not block
120 bb = ByteBuffer.allocate(10);
121 n = sc2.read(bb);
122 assertTrue(n > 0);
123 assertTrue(bb.get(0) == 'X');
124 }
125 });
126 }
127
128 /**
129 * Virtual thread blocks in SocketChannel read.
130 */
131 @ParameterizedTest
132 @MethodSource("threadBuilders")
133 void testSocketChannelRead(Thread.Builder.OfVirtual builder) throws Exception {
134 VThreadRunner.run(builder, () -> {
135 try (var connection = new Connection()) {
136 SocketChannel sc1 = connection.channel1();
137 SocketChannel sc2 = connection.channel2();
138
139 // write to sc1 when current thread blocks in sc2.read
140 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
141 runAfterParkedAsync(() -> sc1.write(bb1));
142
143 // read from sc2 should block
144 ByteBuffer bb2 = ByteBuffer.allocate(10);
145 int n = sc2.read(bb2);
146 assertTrue(n > 0);
147 assertTrue(bb2.get(0) == 'X');
148 }
149 });
150 }
151
152 /**
153 * Virtual thread blocks in SocketChannel write.
154 */
155 @ParameterizedTest
156 @MethodSource("threadBuilders")
157 void testSocketChannelWrite(Thread.Builder.OfVirtual builder) throws Exception {
158 VThreadRunner.run(builder, () -> {
159 try (var connection = new Connection()) {
160 SocketChannel sc1 = connection.channel1();
161 SocketChannel sc2 = connection.channel2();
162
163 // read from sc2 to EOF when current thread blocks in sc1.write
164 Thread reader = runAfterParkedAsync(() -> readToEOF(sc2));
165
166 // write to sc1 should block
167 ByteBuffer bb = ByteBuffer.allocate(100*1024);
168 for (int i=0; i<1000; i++) {
169 int n = sc1.write(bb);
170 assertTrue(n > 0);
171 bb.clear();
172 }
173 sc1.close();
174
175 // wait for reader to finish
176 reader.join();
177 }
178 });
179 }
180
181 /**
182 * SocketChannel close while virtual thread blocked in read.
183 */
184 @ParameterizedTest
185 @MethodSource("threadBuilders")
186 void testSocketChannelReadAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
187 VThreadRunner.run(builder, () -> {
188 try (var connection = new Connection()) {
189 SocketChannel sc = connection.channel1();
190 runAfterParkedAsync(sc::close);
191 try {
192 int n = sc.read(ByteBuffer.allocate(100));
193 fail("read returned " + n);
194 } catch (AsynchronousCloseException expected) { }
195 }
196 });
197 }
198
199 /**
200 * SocketChannel shutdownInput while virtual thread blocked in read.
201 */
202 @ParameterizedTest
203 @MethodSource("threadBuilders")
204 void testSocketChannelReadAsyncShutdownInput(Thread.Builder.OfVirtual builder) throws Exception {
205 VThreadRunner.run(builder, () -> {
206 try (var connection = new Connection()) {
207 SocketChannel sc = connection.channel1();
208 runAfterParkedAsync(sc::shutdownInput);
209 int n = sc.read(ByteBuffer.allocate(100));
210 assertEquals(-1, n);
211 assertTrue(sc.isOpen());
212 }
213 });
214 }
215
216 /**
217 * Virtual thread interrupted while blocked in SocketChannel read.
218 */
219 @ParameterizedTest
220 @MethodSource("threadBuilders")
221 void testSocketChannelReadInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
222 VThreadRunner.run(builder, () -> {
223 try (var connection = new Connection()) {
224 SocketChannel sc = connection.channel1();
225
226 // interrupt current thread when it blocks in read
227 Thread thisThread = Thread.currentThread();
228 runAfterParkedAsync(thisThread::interrupt);
229
230 try {
231 int n = sc.read(ByteBuffer.allocate(100));
232 fail("read returned " + n);
233 } catch (ClosedByInterruptException expected) {
234 assertTrue(Thread.interrupted());
235 }
236 }
237 });
238 }
239
240 /**
241 * SocketChannel close while virtual thread blocked in write.
242 */
243 @ParameterizedTest
244 @MethodSource("threadBuilders")
245 void testSocketChannelWriteAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
246 VThreadRunner.run(builder, () -> {
247 boolean retry = true;
248 while (retry) {
249 try (var connection = new Connection()) {
250 SocketChannel sc = connection.channel1();
251
252 // close sc when current thread blocks in write
253 runAfterParkedAsync(sc::close);
254 try {
255 ByteBuffer bb = ByteBuffer.allocate(100*1024);
256 for (;;) {
257 int n = sc.write(bb);
258 assertTrue(n > 0);
259 bb.clear();
260 }
261 } catch (AsynchronousCloseException expected) {
262 // closed when blocked in write
263 retry = false;
264 } catch (ClosedChannelException e) {
265 // closed when not blocked in write, need to retry test
266 }
267 }
268 }
269 });
270 }
271
272
273 /**
274 * SocketChannel shutdownOutput while virtual thread blocked in write.
275 */
276 @ParameterizedTest
277 @MethodSource("threadBuilders")
278 void testSocketChannelWriteAsyncShutdownOutput(Thread.Builder.OfVirtual builder) throws Exception {
279 VThreadRunner.run(builder, () -> {
280 try (var connection = new Connection()) {
281 SocketChannel sc = connection.channel1();
282
283 // shutdown output when current thread blocks in write
284 runAfterParkedAsync(sc::shutdownOutput);
285 try {
286 ByteBuffer bb = ByteBuffer.allocate(100*1024);
287 for (;;) {
288 int n = sc.write(bb);
289 assertTrue(n > 0);
290 bb.clear();
291 }
292 } catch (ClosedChannelException e) {
293 // expected
294 }
295 assertTrue(sc.isOpen());
296 }
297 });
298 }
299
300 /**
301 * Virtual thread interrupted while blocked in SocketChannel write.
302 */
303 @ParameterizedTest
304 @MethodSource("threadBuilders")
305 void testSocketChannelWriteInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
306 VThreadRunner.run(builder, () -> {
307 boolean retry = true;
308 while (retry) {
309 try (var connection = new Connection()) {
310 SocketChannel sc = connection.channel1();
311
312 // interrupt current thread when it blocks in write
313 Thread thisThread = Thread.currentThread();
314 runAfterParkedAsync(thisThread::interrupt);
315
316 try {
317 ByteBuffer bb = ByteBuffer.allocate(100*1024);
318 for (;;) {
319 int n = sc.write(bb);
320 assertTrue(n > 0);
321 bb.clear();
322 }
323 } catch (ClosedByInterruptException e) {
324 // closed when blocked in write
325 assertTrue(Thread.interrupted());
326 retry = false;
327 } catch (ClosedChannelException e) {
328 // closed when not blocked in write, need to retry test
329 }
330 }
331 }
332 });
333 }
334
335 /**
336 * Virtual thread blocks in SocketChannel adaptor read.
337 */
338 @ParameterizedTest
339 @MethodSource("threadBuilders")
340 void testSocketAdaptorRead1(Thread.Builder.OfVirtual builder) throws Exception {
341 testSocketAdaptorRead(builder, 0);
342 }
343
344 /**
345 * Virtual thread blocks in SocketChannel adaptor read with timeout.
346 */
347 @ParameterizedTest
348 @MethodSource("threadBuilders")
349 void testSocketAdaptorRead2(Thread.Builder.OfVirtual builder) throws Exception {
350 testSocketAdaptorRead(builder, 60_000);
351 }
352
353 private void testSocketAdaptorRead(Thread.Builder.OfVirtual builder,
354 int timeout) throws Exception {
355 VThreadRunner.run(builder, () -> {
356 try (var connection = new Connection()) {
357 SocketChannel sc1 = connection.channel1();
358 SocketChannel sc2 = connection.channel2();
359
360 // write to sc1 when currnet thread blocks reading from sc2
361 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
362 runAfterParkedAsync(() -> sc1.write(bb));
363
364 // read from sc2 should block
365 byte[] array = new byte[100];
366 if (timeout > 0)
367 sc2.socket().setSoTimeout(timeout);
368 int n = sc2.socket().getInputStream().read(array);
369 assertTrue(n > 0);
370 assertTrue(array[0] == 'X');
371 }
372 });
373 }
374
375 /**
376 * ServerSocketChannel accept, no blocking.
377 */
378 @ParameterizedTest
379 @MethodSource("threadBuilders")
380 void testServerSocketChannelAccept1(Thread.Builder.OfVirtual builder) throws Exception {
381 VThreadRunner.run(builder, () -> {
382 try (var ssc = ServerSocketChannel.open()) {
383 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
384 var sc1 = SocketChannel.open(ssc.getLocalAddress());
385 // accept should not block
386 var sc2 = ssc.accept();
387 sc1.close();
388 sc2.close();
389 }
390 });
391 }
392
393 /**
394 * Virtual thread blocks in ServerSocketChannel accept.
395 */
396 @ParameterizedTest
397 @MethodSource("threadBuilders")
398 void testServerSocketChannelAccept2(Thread.Builder.OfVirtual builder) throws Exception {
399 VThreadRunner.run(builder, () -> {
400 try (var ssc = ServerSocketChannel.open()) {
401 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
402 var sc1 = SocketChannel.open();
403
404 // connect when current thread when it blocks in accept
405 runAfterParkedAsync(() -> sc1.connect(ssc.getLocalAddress()));
406
407 // accept should block
408 var sc2 = ssc.accept();
409 sc1.close();
410 sc2.close();
411 }
412 });
413 }
414
415 /**
416 * SeverSocketChannel close while virtual thread blocked in accept.
417 */
418 @ParameterizedTest
419 @MethodSource("threadBuilders")
420 void testServerSocketChannelAcceptAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
421 VThreadRunner.run(builder, () -> {
422 try (var ssc = ServerSocketChannel.open()) {
423 InetAddress lh = InetAddress.getLoopbackAddress();
424 ssc.bind(new InetSocketAddress(lh, 0));
425 runAfterParkedAsync(ssc::close);
426 try {
427 SocketChannel sc = ssc.accept();
428 sc.close();
429 fail("connection accepted???");
430 } catch (AsynchronousCloseException expected) { }
431 }
432 });
433 }
434
435 /**
436 * Virtual thread interrupted while blocked in ServerSocketChannel accept.
437 */
438 @ParameterizedTest
439 @MethodSource("threadBuilders")
440 void testServerSocketChannelAcceptInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
441 VThreadRunner.run(builder, () -> {
442 try (var ssc = ServerSocketChannel.open()) {
443 InetAddress lh = InetAddress.getLoopbackAddress();
444 ssc.bind(new InetSocketAddress(lh, 0));
445
446 // interrupt current thread when it blocks in accept
447 Thread thisThread = Thread.currentThread();
448 runAfterParkedAsync(thisThread::interrupt);
449
450 try {
451 SocketChannel sc = ssc.accept();
452 sc.close();
453 fail("connection accepted???");
454 } catch (ClosedByInterruptException expected) {
455 assertTrue(Thread.interrupted());
456 }
457 }
458 });
459 }
460
461 /**
462 * Virtual thread blocks in ServerSocketChannel adaptor accept.
463 */
464 @ParameterizedTest
465 @MethodSource("threadBuilders")
466 void testSocketChannelAdaptorAccept1(Thread.Builder.OfVirtual builder) throws Exception {
467 testSocketChannelAdaptorAccept(builder, 0);
468 }
469
470 /**
471 * Virtual thread blocks in ServerSocketChannel adaptor accept with timeout.
472 */
473 @ParameterizedTest
474 @MethodSource("threadBuilders")
475 void testSocketChannelAdaptorAccept2(Thread.Builder.OfVirtual builder) throws Exception {
476 testSocketChannelAdaptorAccept(builder, 60_000);
477 }
478
479 private void testSocketChannelAdaptorAccept(Thread.Builder.OfVirtual builder,
480 int timeout) throws Exception {
481 VThreadRunner.run(builder, () -> {
482 try (var ssc = ServerSocketChannel.open()) {
483 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
484 var sc = SocketChannel.open();
485
486 // interrupt current thread when it blocks in accept
487 runAfterParkedAsync(() -> sc.connect(ssc.getLocalAddress()));
488
489 // accept should block
490 if (timeout > 0)
491 ssc.socket().setSoTimeout(timeout);
492 Socket s = ssc.socket().accept();
493 sc.close();
494 s.close();
495 }
496 });
497 }
498
499 /**
500 * DatagramChannel receive/send, no blocking.
501 */
502 @ParameterizedTest
503 @MethodSource("threadBuilders")
504 void testDatagramChannelSendReceive1(Thread.Builder.OfVirtual builder) throws Exception {
505 VThreadRunner.run(builder, () -> {
506 try (DatagramChannel dc1 = DatagramChannel.open();
507 DatagramChannel dc2 = DatagramChannel.open()) {
508
509 InetAddress lh = InetAddress.getLoopbackAddress();
510 dc2.bind(new InetSocketAddress(lh, 0));
511
512 // send should not block
513 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
514 int n = dc1.send(bb, dc2.getLocalAddress());
515 assertTrue(n > 0);
516
517 // receive should not block
518 bb = ByteBuffer.allocate(10);
519 dc2.receive(bb);
520 assertTrue(bb.get(0) == 'X');
521 }
522 });
523 }
524
525 /**
526 * Virtual thread blocks in DatagramChannel receive.
527 */
528 @ParameterizedTest
529 @MethodSource("threadBuilders")
530 void testDatagramChannelSendReceive2(Thread.Builder.OfVirtual builder) throws Exception {
531 VThreadRunner.run(builder, () -> {
532 try (DatagramChannel dc1 = DatagramChannel.open();
533 DatagramChannel dc2 = DatagramChannel.open()) {
534
535 InetAddress lh = InetAddress.getLoopbackAddress();
536 dc2.bind(new InetSocketAddress(lh, 0));
537
538 // send from dc1 when current thread blocked in dc2.receive
539 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
540 runAfterParkedAsync(() -> dc1.send(bb1, dc2.getLocalAddress()));
541
542 // read from dc2 should block
543 ByteBuffer bb2 = ByteBuffer.allocate(10);
544 dc2.receive(bb2);
545 assertTrue(bb2.get(0) == 'X');
546 }
547 });
548 }
549
550 /**
551 * DatagramChannel close while virtual thread blocked in receive.
552 */
553 @ParameterizedTest
554 @MethodSource("threadBuilders")
555 void testDatagramChannelReceiveAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
556 VThreadRunner.run(builder, () -> {
557 try (DatagramChannel dc = DatagramChannel.open()) {
558 InetAddress lh = InetAddress.getLoopbackAddress();
559 dc.bind(new InetSocketAddress(lh, 0));
560 runAfterParkedAsync(dc::close);
561 try {
562 dc.receive(ByteBuffer.allocate(100));
563 fail("receive returned");
564 } catch (AsynchronousCloseException expected) { }
565 }
566 });
567 }
568
569 /**
570 * Virtual thread interrupted while blocked in DatagramChannel receive.
571 */
572 @ParameterizedTest
573 @MethodSource("threadBuilders")
574 void testDatagramChannelReceiveInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
575 VThreadRunner.run(builder, () -> {
576 try (DatagramChannel dc = DatagramChannel.open()) {
577 InetAddress lh = InetAddress.getLoopbackAddress();
578 dc.bind(new InetSocketAddress(lh, 0));
579
580 // interrupt current thread when it blocks in receive
581 Thread thisThread = Thread.currentThread();
582 runAfterParkedAsync(thisThread::interrupt);
583
584 try {
585 dc.receive(ByteBuffer.allocate(100));
586 fail("receive returned");
587 } catch (ClosedByInterruptException expected) {
588 assertTrue(Thread.interrupted());
589 }
590 }
591 });
592 }
593
594 /**
595 * Virtual thread blocks in DatagramSocket adaptor receive.
596 */
597 @ParameterizedTest
598 @MethodSource("threadBuilders")
599 void testDatagramSocketAdaptorReceive1(Thread.Builder.OfVirtual builder) throws Exception {
600 testDatagramSocketAdaptorReceive(builder, 0);
601 }
602
603 /**
604 * Virtual thread blocks in DatagramSocket adaptor receive with timeout.
605 */
606 @ParameterizedTest
607 @MethodSource("threadBuilders")
608 void testDatagramSocketAdaptorReceive2(Thread.Builder.OfVirtual builder) throws Exception {
609 testDatagramSocketAdaptorReceive(builder, 60_000);
610 }
611
612 private void testDatagramSocketAdaptorReceive(Thread.Builder.OfVirtual builder,
613 int timeout) throws Exception {
614 VThreadRunner.run(builder, () -> {
615 try (DatagramChannel dc1 = DatagramChannel.open();
616 DatagramChannel dc2 = DatagramChannel.open()) {
617
618 InetAddress lh = InetAddress.getLoopbackAddress();
619 dc2.bind(new InetSocketAddress(lh, 0));
620
621 // send from dc1 when current thread blocks in dc2 receive
622 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
623 runAfterParkedAsync(() -> dc1.send(bb, dc2.getLocalAddress()));
624
625 // receive should block
626 byte[] array = new byte[100];
627 DatagramPacket p = new DatagramPacket(array, 0, array.length);
628 if (timeout > 0)
629 dc2.socket().setSoTimeout(timeout);
630 dc2.socket().receive(p);
631 assertTrue(p.getLength() == 3 && array[0] == 'X');
632 }
633 });
634 }
635
636 /**
637 * DatagramChannel close while virtual thread blocked in adaptor receive.
638 */
639 @ParameterizedTest
640 @MethodSource("threadBuilders")
641 void testDatagramSocketAdaptorReceiveAsyncClose1(Thread.Builder.OfVirtual builder) throws Exception {
642 testDatagramSocketAdaptorReceiveAsyncClose(builder, 0);
643 }
644
645 /**
646 * DatagramChannel close while virtual thread blocked in adaptor receive
647 * with timeout.
648 */
649 @ParameterizedTest
650 @MethodSource("threadBuilders")
651 void testDatagramSocketAdaptorReceiveAsyncClose2(Thread.Builder.OfVirtual builder) throws Exception {
652 testDatagramSocketAdaptorReceiveAsyncClose(builder, 60_1000);
653 }
654
655 private void testDatagramSocketAdaptorReceiveAsyncClose(Thread.Builder.OfVirtual builder,
656 int timeout) throws Exception {
657 VThreadRunner.run(builder, () -> {
658 try (DatagramChannel dc = DatagramChannel.open()) {
659 InetAddress lh = InetAddress.getLoopbackAddress();
660 dc.bind(new InetSocketAddress(lh, 0));
661
662 byte[] array = new byte[100];
663 DatagramPacket p = new DatagramPacket(array, 0, array.length);
664 if (timeout > 0)
665 dc.socket().setSoTimeout(timeout);
666
667 // close channel/socket when current thread blocks in receive
668 runAfterParkedAsync(dc::close);
669
670 assertThrows(SocketException.class, () -> dc.socket().receive(p));
671 }
672 });
673 }
674
675 /**
676 * Virtual thread interrupted while blocked in DatagramSocket adaptor receive.
677 */
678 @ParameterizedTest
679 @MethodSource("threadBuilders")
680 void testDatagramSocketAdaptorReceiveInterrupt1(Thread.Builder.OfVirtual builder) throws Exception {
681 testDatagramSocketAdaptorReceiveInterrupt(builder, 0);
682 }
683
684 /**
685 * Virtual thread interrupted while blocked in DatagramSocket adaptor receive
686 * with timeout.
687 */
688 @ParameterizedTest
689 @MethodSource("threadBuilders")
690 void testDatagramSocketAdaptorReceiveInterrupt2(Thread.Builder.OfVirtual builder) throws Exception {
691 testDatagramSocketAdaptorReceiveInterrupt(builder, 60_1000);
692 }
693
694 private void testDatagramSocketAdaptorReceiveInterrupt(Thread.Builder.OfVirtual builder,
695 int timeout) throws Exception {
696 VThreadRunner.run(builder, () -> {
697 try (DatagramChannel dc = DatagramChannel.open()) {
698 InetAddress lh = InetAddress.getLoopbackAddress();
699 dc.bind(new InetSocketAddress(lh, 0));
700
701 byte[] array = new byte[100];
702 DatagramPacket p = new DatagramPacket(array, 0, array.length);
703 if (timeout > 0)
704 dc.socket().setSoTimeout(timeout);
705
706 // interrupt current thread when it blocks in receive
707 Thread thisThread = Thread.currentThread();
708 runAfterParkedAsync(thisThread::interrupt);
709
710 try {
711 dc.socket().receive(p);
712 fail();
713 } catch (ClosedByInterruptException expected) {
714 assertTrue(Thread.interrupted());
715 }
716 }
717 });
718 }
719
720 /**
721 * Pipe read/write, no blocking.
722 */
723 @ParameterizedTest
724 @MethodSource("threadBuilders")
725 void testPipeReadWrite1(Thread.Builder.OfVirtual builder) throws Exception {
726 VThreadRunner.run(builder, () -> {
727 Pipe p = Pipe.open();
728 try (Pipe.SinkChannel sink = p.sink();
729 Pipe.SourceChannel source = p.source()) {
730
731 // write should not block
732 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
733 int n = sink.write(bb);
734 assertTrue(n > 0);
735
736 // read should not block
737 bb = ByteBuffer.allocate(10);
738 n = source.read(bb);
739 assertTrue(n > 0);
740 assertTrue(bb.get(0) == 'X');
741 }
742 });
743 }
744
745 /**
746 * Virtual thread blocks in Pipe.SourceChannel read.
747 */
748 @ParameterizedTest
749 @MethodSource("threadBuilders")
750 void testPipeReadWrite2(Thread.Builder.OfVirtual builder) throws Exception {
751 VThreadRunner.run(builder, () -> {
752 Pipe p = Pipe.open();
753 try (Pipe.SinkChannel sink = p.sink();
754 Pipe.SourceChannel source = p.source()) {
755
756 // write from sink when current thread blocks reading from source
757 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
758 runAfterParkedAsync(() -> sink.write(bb1));
759
760 // read should block
761 ByteBuffer bb2 = ByteBuffer.allocate(10);
762 int n = source.read(bb2);
763 assertTrue(n > 0);
764 assertTrue(bb2.get(0) == 'X');
765 }
766 });
767 }
768
769 /**
770 * Virtual thread blocks in Pipe.SinkChannel write.
771 */
772 @ParameterizedTest
773 @MethodSource("threadBuilders")
774 void testPipeReadWrite3(Thread.Builder.OfVirtual builder) throws Exception {
775 VThreadRunner.run(builder, () -> {
776 Pipe p = Pipe.open();
777 try (Pipe.SinkChannel sink = p.sink();
778 Pipe.SourceChannel source = p.source()) {
779
780 // read from source to EOF when current thread blocking in write
781 Thread reader = runAfterParkedAsync(() -> readToEOF(source));
782
783 // write to sink should block
784 ByteBuffer bb = ByteBuffer.allocate(100*1024);
785 for (int i=0; i<1000; i++) {
786 int n = sink.write(bb);
787 assertTrue(n > 0);
788 bb.clear();
789 }
790 sink.close();
791
792 // wait for reader to finish
793 reader.join();
794 }
795 });
796 }
797
798 /**
799 * Pipe.SourceChannel close while virtual thread blocked in read.
800 */
801 @ParameterizedTest
802 @MethodSource("threadBuilders")
803 void testPipeReadAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
804 VThreadRunner.run(builder, () -> {
805 Pipe p = Pipe.open();
806 try (Pipe.SinkChannel sink = p.sink();
807 Pipe.SourceChannel source = p.source()) {
808 runAfterParkedAsync(source::close);
809 try {
810 int n = source.read(ByteBuffer.allocate(100));
811 fail("read returned " + n);
812 } catch (AsynchronousCloseException expected) { }
813 }
814 });
815 }
816
817 /**
818 * Virtual thread interrupted while blocked in Pipe.SourceChannel read.
819 */
820 @ParameterizedTest
821 @MethodSource("threadBuilders")
822 void testPipeReadInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
823 VThreadRunner.run(builder, () -> {
824 Pipe p = Pipe.open();
825 try (Pipe.SinkChannel sink = p.sink();
826 Pipe.SourceChannel source = p.source()) {
827
828 // interrupt current thread when it blocks reading from source
829 Thread thisThread = Thread.currentThread();
830 runAfterParkedAsync(thisThread::interrupt);
831
832 try {
833 int n = source.read(ByteBuffer.allocate(100));
834 fail("read returned " + n);
835 } catch (ClosedByInterruptException expected) {
836 assertTrue(Thread.interrupted());
837 }
838 }
839 });
840 }
841
842 /**
843 * Pipe.SinkChannel close while virtual thread blocked in write.
844 */
845 @ParameterizedTest
846 @MethodSource("threadBuilders")
847 void testPipeWriteAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
848 VThreadRunner.run(builder, () -> {
849 boolean retry = true;
850 while (retry) {
851 Pipe p = Pipe.open();
852 try (Pipe.SinkChannel sink = p.sink();
853 Pipe.SourceChannel source = p.source()) {
854
855 // close sink when current thread blocks in write
856 runAfterParkedAsync(sink::close);
857 try {
858 ByteBuffer bb = ByteBuffer.allocate(100*1024);
859 for (;;) {
860 int n = sink.write(bb);
861 assertTrue(n > 0);
862 bb.clear();
863 }
864 } catch (AsynchronousCloseException e) {
865 // closed when blocked in write
866 retry = false;
867 } catch (ClosedChannelException e) {
868 // closed when not blocked in write, need to retry test
869 }
870 }
871 }
872 });
873 }
874
875 /**
876 * Virtual thread interrupted while blocked in Pipe.SinkChannel write.
877 */
878 @ParameterizedTest
879 @MethodSource("threadBuilders")
880 void testPipeWriteInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
881 VThreadRunner.run(builder, () -> {
882 boolean retry = true;
883 while (retry) {
884 Pipe p = Pipe.open();
885 try (Pipe.SinkChannel sink = p.sink();
886 Pipe.SourceChannel source = p.source()) {
887
888 // interrupt current thread when it blocks in write
889 Thread thisThread = Thread.currentThread();
890 runAfterParkedAsync(thisThread::interrupt);
891
892 try {
893 ByteBuffer bb = ByteBuffer.allocate(100*1024);
894 for (;;) {
895 int n = sink.write(bb);
896 assertTrue(n > 0);
897 bb.clear();
898 }
899 } catch (ClosedByInterruptException expected) {
900 // closed when blocked in write
901 assertTrue(Thread.interrupted());
902 retry = false;
903 } catch (ClosedChannelException e) {
904 // closed when not blocked in write, need to retry test
905 }
906 }
907 }
908 });
909 }
910
911 /**
912 * Creates a loopback connection
913 */
914 static class Connection implements Closeable {
915 private final SocketChannel sc1;
916 private final SocketChannel sc2;
917 Connection() throws IOException {
918 var lh = InetAddress.getLoopbackAddress();
919 try (var listener = ServerSocketChannel.open()) {
920 listener.bind(new InetSocketAddress(lh, 0));
921 SocketChannel sc1 = SocketChannel.open();
922 SocketChannel sc2 = null;
923 try {
924 sc1.socket().connect(listener.getLocalAddress());
925 sc2 = listener.accept();
926 } catch (IOException ioe) {
927 sc1.close();
928 throw ioe;
929 }
930 this.sc1 = sc1;
931 this.sc2 = sc2;
932 }
933 }
934 SocketChannel channel1() {
935 return sc1;
936 }
937 SocketChannel channel2() {
938 return sc2;
939 }
940 @Override
941 public void close() throws IOException {
942 sc1.close();
943 sc2.close();
944 }
945 }
946
947 /**
948 * Read from a channel until all bytes have been read or an I/O error occurs.
949 */
950 static void readToEOF(ReadableByteChannel rbc) throws IOException {
951 ByteBuffer bb = ByteBuffer.allocate(16*1024);
952 int n;
953 while ((n = rbc.read(bb)) > 0) {
954 bb.clear();
955 }
956 }
957
958 @FunctionalInterface
959 interface ThrowingRunnable {
960 void run() throws Exception;
961 }
962
963 /**
964 * Runs the given task asynchronously after the current virtual thread has parked.
965 * @return the thread started to run the task
966 */
967 static Thread runAfterParkedAsync(ThrowingRunnable task) {
968 Thread target = Thread.currentThread();
969 if (!target.isVirtual())
970 throw new WrongThreadException();
971 return Thread.ofPlatform().daemon().start(() -> {
972 try {
973 Thread.State state = target.getState();
974 while (state != Thread.State.WAITING
975 && state != Thread.State.TIMED_WAITING) {
976 Thread.sleep(20);
977 state = target.getState();
978 }
979 Thread.sleep(20); // give a bit more time to release carrier
980 task.run();
981 } catch (Exception e) {
982 e.printStackTrace();
983 }
984 });
985 }
986 }