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/othervm 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 * @run junit/othervm -Djdk.pollerMode=3 BlockingChannelOps
39 */
40
41 /*
42 * @test id=io_uring
43 * @requires os.family == "linux"
44 * @library /test/lib
45 * @run junit/othervm -Djdk.pollerMode=1 -Djdk.io_uring=true BlockingChannelOps
46 * @run junit/othervm -Djdk.pollerMode=2 -Djdk.io_uring=true BlockingChannelOps
47 * @run junit/othervm -Djdk.pollerMode=3 -Djdk.io_uring=true BlockingChannelOps
48 */
49
50 /*
51 * @test id=no-vmcontinuations
52 * @requires vm.continuations
53 * @library /test/lib
54 * @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations BlockingChannelOps
55 */
56
57 import java.io.Closeable;
58 import java.io.IOException;
59 import java.net.DatagramPacket;
60 import java.net.InetAddress;
61 import java.net.InetSocketAddress;
62 import java.net.Socket;
63 import java.net.SocketAddress;
64 import java.net.SocketException;
65 import java.nio.ByteBuffer;
66 import java.nio.channels.AsynchronousCloseException;
67 import java.nio.channels.ClosedByInterruptException;
68 import java.nio.channels.ClosedChannelException;
69 import java.nio.channels.DatagramChannel;
70 import java.nio.channels.Pipe;
71 import java.nio.channels.ReadableByteChannel;
72 import java.nio.channels.ServerSocketChannel;
73 import java.nio.channels.SocketChannel;
74 import java.nio.channels.WritableByteChannel;
75 import java.util.concurrent.ExecutorService;
76 import java.util.concurrent.Executors;
77 import java.util.concurrent.ThreadFactory;
78 import java.util.stream.Stream;
79
80 import jdk.test.lib.thread.VThreadRunner;
81 import jdk.test.lib.thread.VThreadScheduler;
82
83 import org.junit.jupiter.api.BeforeAll;
84 import org.junit.jupiter.params.ParameterizedTest;
85 import org.junit.jupiter.params.provider.MethodSource;
86 import static org.junit.jupiter.api.Assertions.*;
87
88 class BlockingChannelOps {
89 private static ExecutorService threadPool;
90 private static Thread.VirtualThreadScheduler customScheduler;
91
92 @BeforeAll
93 static void setup() {
94 ThreadFactory factory = Thread.ofPlatform().daemon().factory();
95 threadPool = Executors.newCachedThreadPool(factory);
96 customScheduler = (_, task) -> threadPool.execute(task);
97 }
98
99 /**
100 * Returns the Thread.Builder to create the virtual thread.
101 */
102 static Stream<Thread.Builder.OfVirtual> threadBuilders() {
103 if (VThreadScheduler.supportsCustomScheduler()) {
104 return Stream.of(Thread.ofVirtual(), Thread.ofVirtual().scheduler(customScheduler));
105 } else {
106 return Stream.of(Thread.ofVirtual());
107 }
108 }
109
110 /**
111 * SocketChannel read/write, no blocking.
112 */
113 @ParameterizedTest
114 @MethodSource("threadBuilders")
115 void testSocketChannelReadWrite1(Thread.Builder.OfVirtual builder) throws Exception {
116 VThreadRunner.run(builder, () -> {
117 try (var connection = new Connection()) {
118 SocketChannel sc1 = connection.channel1();
119 SocketChannel sc2 = connection.channel2();
120
121 // write to sc1
122 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
123 int n = sc1.write(bb);
124 assertTrue(n > 0);
125
126 // read from sc2 should not block
127 bb = ByteBuffer.allocate(10);
128 n = sc2.read(bb);
129 assertTrue(n > 0);
130 assertTrue(bb.get(0) == 'X');
131 }
132 });
133 }
134
135 /**
136 * Virtual thread blocks in SocketChannel read.
137 */
138 @ParameterizedTest
139 @MethodSource("threadBuilders")
140 void testSocketChannelRead(Thread.Builder.OfVirtual builder) throws Exception {
141 VThreadRunner.run(builder, () -> {
142 try (var connection = new Connection()) {
143 SocketChannel sc1 = connection.channel1();
144 SocketChannel sc2 = connection.channel2();
145
146 // write to sc1 when current thread blocks in sc2.read
147 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
148 runAfterParkedAsync(() -> sc1.write(bb1));
149
150 // read from sc2 should block
151 ByteBuffer bb2 = ByteBuffer.allocate(10);
152 int n = sc2.read(bb2);
153 assertTrue(n > 0);
154 assertTrue(bb2.get(0) == 'X');
155 }
156 });
157 }
158
159 /**
160 * Virtual thread blocks in SocketChannel write.
161 */
162 @ParameterizedTest
163 @MethodSource("threadBuilders")
164 void testSocketChannelWrite(Thread.Builder.OfVirtual builder) throws Exception {
165 VThreadRunner.run(builder, () -> {
166 try (var connection = new Connection()) {
167 SocketChannel sc1 = connection.channel1();
168 SocketChannel sc2 = connection.channel2();
169
170 // read from sc2 to EOF when current thread blocks in sc1.write
171 Thread reader = runAfterParkedAsync(() -> readToEOF(sc2));
172
173 // write to sc1 should block
174 ByteBuffer bb = ByteBuffer.allocate(100*1024);
175 for (int i=0; i<1000; i++) {
176 int n = sc1.write(bb);
177 assertTrue(n > 0);
178 bb.clear();
179 }
180 sc1.close();
181
182 // wait for reader to finish
183 reader.join();
184 }
185 });
186 }
187
188 /**
189 * SocketChannel close while virtual thread blocked in read.
190 */
191 @ParameterizedTest
192 @MethodSource("threadBuilders")
193 void testSocketChannelReadAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
194 VThreadRunner.run(builder, () -> {
195 try (var connection = new Connection()) {
196 SocketChannel sc = connection.channel1();
197 runAfterParkedAsync(sc::close);
198 try {
199 int n = sc.read(ByteBuffer.allocate(100));
200 fail("read returned " + n);
201 } catch (AsynchronousCloseException expected) { }
202 }
203 });
204 }
205
206 /**
207 * SocketChannel shutdownInput while virtual thread blocked in read.
208 */
209 @ParameterizedTest
210 @MethodSource("threadBuilders")
211 void testSocketChannelReadAsyncShutdownInput(Thread.Builder.OfVirtual builder) throws Exception {
212 VThreadRunner.run(builder, () -> {
213 try (var connection = new Connection()) {
214 SocketChannel sc = connection.channel1();
215 runAfterParkedAsync(sc::shutdownInput);
216 int n = sc.read(ByteBuffer.allocate(100));
217 assertEquals(-1, n);
218 assertTrue(sc.isOpen());
219 }
220 });
221 }
222
223 /**
224 * Virtual thread interrupted while blocked in SocketChannel read.
225 */
226 @ParameterizedTest
227 @MethodSource("threadBuilders")
228 void testSocketChannelReadInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
229 VThreadRunner.run(builder, () -> {
230 try (var connection = new Connection()) {
231 SocketChannel sc = connection.channel1();
232
233 // interrupt current thread when it blocks in read
234 Thread thisThread = Thread.currentThread();
235 runAfterParkedAsync(thisThread::interrupt);
236
237 try {
238 int n = sc.read(ByteBuffer.allocate(100));
239 fail("read returned " + n);
240 } catch (ClosedByInterruptException expected) {
241 assertTrue(Thread.interrupted());
242 }
243 }
244 });
245 }
246
247 /**
248 * SocketChannel close while virtual thread blocked in write.
249 */
250 @ParameterizedTest
251 @MethodSource("threadBuilders")
252 void testSocketChannelWriteAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
253 VThreadRunner.run(builder, () -> {
254 boolean retry = true;
255 while (retry) {
256 try (var connection = new Connection()) {
257 SocketChannel sc = connection.channel1();
258
259 // close sc when current thread blocks in write
260 runAfterParkedAsync(sc::close);
261 try {
262 ByteBuffer bb = ByteBuffer.allocate(100*1024);
263 for (;;) {
264 int n = sc.write(bb);
265 assertTrue(n > 0);
266 bb.clear();
267 }
268 } catch (AsynchronousCloseException expected) {
269 // closed when blocked in write
270 retry = false;
271 } catch (ClosedChannelException e) {
272 // closed when not blocked in write, need to retry test
273 }
274 }
275 }
276 });
277 }
278
279
280 /**
281 * SocketChannel shutdownOutput while virtual thread blocked in write.
282 */
283 @ParameterizedTest
284 @MethodSource("threadBuilders")
285 void testSocketChannelWriteAsyncShutdownOutput(Thread.Builder.OfVirtual builder) throws Exception {
286 VThreadRunner.run(builder, () -> {
287 try (var connection = new Connection()) {
288 SocketChannel sc = connection.channel1();
289
290 // shutdown output when current thread blocks in write
291 runAfterParkedAsync(sc::shutdownOutput);
292 try {
293 ByteBuffer bb = ByteBuffer.allocate(100*1024);
294 for (;;) {
295 int n = sc.write(bb);
296 assertTrue(n > 0);
297 bb.clear();
298 }
299 } catch (ClosedChannelException e) {
300 // expected
301 }
302 assertTrue(sc.isOpen());
303 }
304 });
305 }
306
307 /**
308 * Virtual thread interrupted while blocked in SocketChannel write.
309 */
310 @ParameterizedTest
311 @MethodSource("threadBuilders")
312 void testSocketChannelWriteInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
313 VThreadRunner.run(builder, () -> {
314 boolean retry = true;
315 while (retry) {
316 try (var connection = new Connection()) {
317 SocketChannel sc = connection.channel1();
318
319 // interrupt current thread when it blocks in write
320 Thread thisThread = Thread.currentThread();
321 runAfterParkedAsync(thisThread::interrupt);
322
323 try {
324 ByteBuffer bb = ByteBuffer.allocate(100*1024);
325 for (;;) {
326 int n = sc.write(bb);
327 assertTrue(n > 0);
328 bb.clear();
329 }
330 } catch (ClosedByInterruptException e) {
331 // closed when blocked in write
332 assertTrue(Thread.interrupted());
333 retry = false;
334 } catch (ClosedChannelException e) {
335 // closed when not blocked in write, need to retry test
336 }
337 }
338 }
339 });
340 }
341
342 /**
343 * Virtual thread blocks in SocketChannel adaptor read.
344 */
345 @ParameterizedTest
346 @MethodSource("threadBuilders")
347 void testSocketAdaptorRead1(Thread.Builder.OfVirtual builder) throws Exception {
348 testSocketAdaptorRead(builder, 0);
349 }
350
351 /**
352 * Virtual thread blocks in SocketChannel adaptor read with timeout.
353 */
354 @ParameterizedTest
355 @MethodSource("threadBuilders")
356 void testSocketAdaptorRead2(Thread.Builder.OfVirtual builder) throws Exception {
357 testSocketAdaptorRead(builder, 60_000);
358 }
359
360 private void testSocketAdaptorRead(Thread.Builder.OfVirtual builder,
361 int timeout) throws Exception {
362 VThreadRunner.run(builder, () -> {
363 try (var connection = new Connection()) {
364 SocketChannel sc1 = connection.channel1();
365 SocketChannel sc2 = connection.channel2();
366
367 // write to sc1 when currnet thread blocks reading from sc2
368 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
369 runAfterParkedAsync(() -> sc1.write(bb));
370
371 // read from sc2 should block
372 byte[] array = new byte[100];
373 if (timeout > 0)
374 sc2.socket().setSoTimeout(timeout);
375 int n = sc2.socket().getInputStream().read(array);
376 assertTrue(n > 0);
377 assertTrue(array[0] == 'X');
378 }
379 });
380 }
381
382 /**
383 * ServerSocketChannel accept, no blocking.
384 */
385 @ParameterizedTest
386 @MethodSource("threadBuilders")
387 void testServerSocketChannelAccept1(Thread.Builder.OfVirtual builder) throws Exception {
388 VThreadRunner.run(builder, () -> {
389 try (var ssc = ServerSocketChannel.open()) {
390 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
391 var sc1 = SocketChannel.open(ssc.getLocalAddress());
392 // accept should not block
393 var sc2 = ssc.accept();
394 sc1.close();
395 sc2.close();
396 }
397 });
398 }
399
400 /**
401 * Virtual thread blocks in ServerSocketChannel accept.
402 */
403 @ParameterizedTest
404 @MethodSource("threadBuilders")
405 void testServerSocketChannelAccept2(Thread.Builder.OfVirtual builder) throws Exception {
406 VThreadRunner.run(builder, () -> {
407 try (var ssc = ServerSocketChannel.open()) {
408 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
409 var sc1 = SocketChannel.open();
410
411 // connect when current thread when it blocks in accept
412 runAfterParkedAsync(() -> sc1.connect(ssc.getLocalAddress()));
413
414 // accept should block
415 var sc2 = ssc.accept();
416 sc1.close();
417 sc2.close();
418 }
419 });
420 }
421
422 /**
423 * SeverSocketChannel close while virtual thread blocked in accept.
424 */
425 @ParameterizedTest
426 @MethodSource("threadBuilders")
427 void testServerSocketChannelAcceptAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
428 VThreadRunner.run(builder, () -> {
429 try (var ssc = ServerSocketChannel.open()) {
430 InetAddress lh = InetAddress.getLoopbackAddress();
431 ssc.bind(new InetSocketAddress(lh, 0));
432 runAfterParkedAsync(ssc::close);
433 try {
434 SocketChannel sc = ssc.accept();
435 sc.close();
436 fail("connection accepted???");
437 } catch (AsynchronousCloseException expected) { }
438 }
439 });
440 }
441
442 /**
443 * Virtual thread interrupted while blocked in ServerSocketChannel accept.
444 */
445 @ParameterizedTest
446 @MethodSource("threadBuilders")
447 void testServerSocketChannelAcceptInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
448 VThreadRunner.run(builder, () -> {
449 try (var ssc = ServerSocketChannel.open()) {
450 InetAddress lh = InetAddress.getLoopbackAddress();
451 ssc.bind(new InetSocketAddress(lh, 0));
452
453 // interrupt current thread when it blocks in accept
454 Thread thisThread = Thread.currentThread();
455 runAfterParkedAsync(thisThread::interrupt);
456
457 try {
458 SocketChannel sc = ssc.accept();
459 sc.close();
460 fail("connection accepted???");
461 } catch (ClosedByInterruptException expected) {
462 assertTrue(Thread.interrupted());
463 }
464 }
465 });
466 }
467
468 /**
469 * Virtual thread blocks in ServerSocketChannel adaptor accept.
470 */
471 @ParameterizedTest
472 @MethodSource("threadBuilders")
473 void testSocketChannelAdaptorAccept1(Thread.Builder.OfVirtual builder) throws Exception {
474 testSocketChannelAdaptorAccept(builder, 0);
475 }
476
477 /**
478 * Virtual thread blocks in ServerSocketChannel adaptor accept with timeout.
479 */
480 @ParameterizedTest
481 @MethodSource("threadBuilders")
482 void testSocketChannelAdaptorAccept2(Thread.Builder.OfVirtual builder) throws Exception {
483 testSocketChannelAdaptorAccept(builder, 60_000);
484 }
485
486 private void testSocketChannelAdaptorAccept(Thread.Builder.OfVirtual builder,
487 int timeout) throws Exception {
488 VThreadRunner.run(builder, () -> {
489 try (var ssc = ServerSocketChannel.open()) {
490 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
491 var sc = SocketChannel.open();
492
493 // interrupt current thread when it blocks in accept
494 runAfterParkedAsync(() -> sc.connect(ssc.getLocalAddress()));
495
496 // accept should block
497 if (timeout > 0)
498 ssc.socket().setSoTimeout(timeout);
499 Socket s = ssc.socket().accept();
500 sc.close();
501 s.close();
502 }
503 });
504 }
505
506 /**
507 * DatagramChannel receive/send, no blocking.
508 */
509 @ParameterizedTest
510 @MethodSource("threadBuilders")
511 void testDatagramChannelSendReceive1(Thread.Builder.OfVirtual builder) throws Exception {
512 VThreadRunner.run(builder, () -> {
513 try (DatagramChannel dc1 = DatagramChannel.open();
514 DatagramChannel dc2 = DatagramChannel.open()) {
515
516 InetAddress lh = InetAddress.getLoopbackAddress();
517 dc2.bind(new InetSocketAddress(lh, 0));
518
519 // send should not block
520 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
521 int n = dc1.send(bb, dc2.getLocalAddress());
522 assertTrue(n > 0);
523
524 // receive should not block
525 bb = ByteBuffer.allocate(10);
526 dc2.receive(bb);
527 assertTrue(bb.get(0) == 'X');
528 }
529 });
530 }
531
532 /**
533 * Virtual thread blocks in DatagramChannel receive.
534 */
535 @ParameterizedTest
536 @MethodSource("threadBuilders")
537 void testDatagramChannelSendReceive2(Thread.Builder.OfVirtual builder) throws Exception {
538 VThreadRunner.run(builder, () -> {
539 try (DatagramChannel dc1 = DatagramChannel.open();
540 DatagramChannel dc2 = DatagramChannel.open()) {
541
542 InetAddress lh = InetAddress.getLoopbackAddress();
543 dc2.bind(new InetSocketAddress(lh, 0));
544
545 // send from dc1 when current thread blocked in dc2.receive
546 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
547 runAfterParkedAsync(() -> dc1.send(bb1, dc2.getLocalAddress()));
548
549 // read from dc2 should block
550 ByteBuffer bb2 = ByteBuffer.allocate(10);
551 dc2.receive(bb2);
552 assertTrue(bb2.get(0) == 'X');
553 }
554 });
555 }
556
557 /**
558 * DatagramChannel close while virtual thread blocked in receive.
559 */
560 @ParameterizedTest
561 @MethodSource("threadBuilders")
562 void testDatagramChannelReceiveAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
563 VThreadRunner.run(builder, () -> {
564 try (DatagramChannel dc = DatagramChannel.open()) {
565 InetAddress lh = InetAddress.getLoopbackAddress();
566 dc.bind(new InetSocketAddress(lh, 0));
567 runAfterParkedAsync(dc::close);
568 try {
569 dc.receive(ByteBuffer.allocate(100));
570 fail("receive returned");
571 } catch (AsynchronousCloseException expected) { }
572 }
573 });
574 }
575
576 /**
577 * Virtual thread interrupted while blocked in DatagramChannel receive.
578 */
579 @ParameterizedTest
580 @MethodSource("threadBuilders")
581 void testDatagramChannelReceiveInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
582 VThreadRunner.run(builder, () -> {
583 try (DatagramChannel dc = DatagramChannel.open()) {
584 InetAddress lh = InetAddress.getLoopbackAddress();
585 dc.bind(new InetSocketAddress(lh, 0));
586
587 // interrupt current thread when it blocks in receive
588 Thread thisThread = Thread.currentThread();
589 runAfterParkedAsync(thisThread::interrupt);
590
591 try {
592 dc.receive(ByteBuffer.allocate(100));
593 fail("receive returned");
594 } catch (ClosedByInterruptException expected) {
595 assertTrue(Thread.interrupted());
596 }
597 }
598 });
599 }
600
601 /**
602 * Virtual thread blocks in DatagramSocket adaptor receive.
603 */
604 @ParameterizedTest
605 @MethodSource("threadBuilders")
606 void testDatagramSocketAdaptorReceive1(Thread.Builder.OfVirtual builder) throws Exception {
607 testDatagramSocketAdaptorReceive(builder, 0);
608 }
609
610 /**
611 * Virtual thread blocks in DatagramSocket adaptor receive with timeout.
612 */
613 @ParameterizedTest
614 @MethodSource("threadBuilders")
615 void testDatagramSocketAdaptorReceive2(Thread.Builder.OfVirtual builder) throws Exception {
616 testDatagramSocketAdaptorReceive(builder, 60_000);
617 }
618
619 private void testDatagramSocketAdaptorReceive(Thread.Builder.OfVirtual builder,
620 int timeout) throws Exception {
621 VThreadRunner.run(builder, () -> {
622 try (DatagramChannel dc1 = DatagramChannel.open();
623 DatagramChannel dc2 = DatagramChannel.open()) {
624
625 InetAddress lh = InetAddress.getLoopbackAddress();
626 dc2.bind(new InetSocketAddress(lh, 0));
627
628 // send from dc1 when current thread blocks in dc2 receive
629 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
630 runAfterParkedAsync(() -> dc1.send(bb, dc2.getLocalAddress()));
631
632 // receive should block
633 byte[] array = new byte[100];
634 DatagramPacket p = new DatagramPacket(array, 0, array.length);
635 if (timeout > 0)
636 dc2.socket().setSoTimeout(timeout);
637 dc2.socket().receive(p);
638 assertTrue(p.getLength() == 3 && array[0] == 'X');
639 }
640 });
641 }
642
643 /**
644 * DatagramChannel close while virtual thread blocked in adaptor receive.
645 */
646 @ParameterizedTest
647 @MethodSource("threadBuilders")
648 void testDatagramSocketAdaptorReceiveAsyncClose1(Thread.Builder.OfVirtual builder) throws Exception {
649 testDatagramSocketAdaptorReceiveAsyncClose(builder, 0);
650 }
651
652 /**
653 * DatagramChannel close while virtual thread blocked in adaptor receive
654 * with timeout.
655 */
656 @ParameterizedTest
657 @MethodSource("threadBuilders")
658 void testDatagramSocketAdaptorReceiveAsyncClose2(Thread.Builder.OfVirtual builder) throws Exception {
659 testDatagramSocketAdaptorReceiveAsyncClose(builder, 60_1000);
660 }
661
662 private void testDatagramSocketAdaptorReceiveAsyncClose(Thread.Builder.OfVirtual builder,
663 int timeout) throws Exception {
664 VThreadRunner.run(builder, () -> {
665 try (DatagramChannel dc = DatagramChannel.open()) {
666 InetAddress lh = InetAddress.getLoopbackAddress();
667 dc.bind(new InetSocketAddress(lh, 0));
668
669 byte[] array = new byte[100];
670 DatagramPacket p = new DatagramPacket(array, 0, array.length);
671 if (timeout > 0)
672 dc.socket().setSoTimeout(timeout);
673
674 // close channel/socket when current thread blocks in receive
675 runAfterParkedAsync(dc::close);
676
677 assertThrows(SocketException.class, () -> dc.socket().receive(p));
678 }
679 });
680 }
681
682 /**
683 * Virtual thread interrupted while blocked in DatagramSocket adaptor receive.
684 */
685 @ParameterizedTest
686 @MethodSource("threadBuilders")
687 void testDatagramSocketAdaptorReceiveInterrupt1(Thread.Builder.OfVirtual builder) throws Exception {
688 testDatagramSocketAdaptorReceiveInterrupt(builder, 0);
689 }
690
691 /**
692 * Virtual thread interrupted while blocked in DatagramSocket adaptor receive
693 * with timeout.
694 */
695 @ParameterizedTest
696 @MethodSource("threadBuilders")
697 void testDatagramSocketAdaptorReceiveInterrupt2(Thread.Builder.OfVirtual builder) throws Exception {
698 testDatagramSocketAdaptorReceiveInterrupt(builder, 60_1000);
699 }
700
701 private void testDatagramSocketAdaptorReceiveInterrupt(Thread.Builder.OfVirtual builder,
702 int timeout) throws Exception {
703 VThreadRunner.run(builder, () -> {
704 try (DatagramChannel dc = DatagramChannel.open()) {
705 InetAddress lh = InetAddress.getLoopbackAddress();
706 dc.bind(new InetSocketAddress(lh, 0));
707
708 byte[] array = new byte[100];
709 DatagramPacket p = new DatagramPacket(array, 0, array.length);
710 if (timeout > 0)
711 dc.socket().setSoTimeout(timeout);
712
713 // interrupt current thread when it blocks in receive
714 Thread thisThread = Thread.currentThread();
715 runAfterParkedAsync(thisThread::interrupt);
716
717 try {
718 dc.socket().receive(p);
719 fail();
720 } catch (ClosedByInterruptException expected) {
721 assertTrue(Thread.interrupted());
722 }
723 }
724 });
725 }
726
727 /**
728 * Pipe read/write, no blocking.
729 */
730 @ParameterizedTest
731 @MethodSource("threadBuilders")
732 void testPipeReadWrite1(Thread.Builder.OfVirtual builder) throws Exception {
733 VThreadRunner.run(builder, () -> {
734 Pipe p = Pipe.open();
735 try (Pipe.SinkChannel sink = p.sink();
736 Pipe.SourceChannel source = p.source()) {
737
738 // write should not block
739 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
740 int n = sink.write(bb);
741 assertTrue(n > 0);
742
743 // read should not block
744 bb = ByteBuffer.allocate(10);
745 n = source.read(bb);
746 assertTrue(n > 0);
747 assertTrue(bb.get(0) == 'X');
748 }
749 });
750 }
751
752 /**
753 * Virtual thread blocks in Pipe.SourceChannel read.
754 */
755 @ParameterizedTest
756 @MethodSource("threadBuilders")
757 void testPipeReadWrite2(Thread.Builder.OfVirtual builder) throws Exception {
758 VThreadRunner.run(builder, () -> {
759 Pipe p = Pipe.open();
760 try (Pipe.SinkChannel sink = p.sink();
761 Pipe.SourceChannel source = p.source()) {
762
763 // write from sink when current thread blocks reading from source
764 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
765 runAfterParkedAsync(() -> sink.write(bb1));
766
767 // read should block
768 ByteBuffer bb2 = ByteBuffer.allocate(10);
769 int n = source.read(bb2);
770 assertTrue(n > 0);
771 assertTrue(bb2.get(0) == 'X');
772 }
773 });
774 }
775
776 /**
777 * Virtual thread blocks in Pipe.SinkChannel write.
778 */
779 @ParameterizedTest
780 @MethodSource("threadBuilders")
781 void testPipeReadWrite3(Thread.Builder.OfVirtual builder) throws Exception {
782 VThreadRunner.run(builder, () -> {
783 Pipe p = Pipe.open();
784 try (Pipe.SinkChannel sink = p.sink();
785 Pipe.SourceChannel source = p.source()) {
786
787 // read from source to EOF when current thread blocking in write
788 Thread reader = runAfterParkedAsync(() -> readToEOF(source));
789
790 // write to sink should block
791 ByteBuffer bb = ByteBuffer.allocate(100*1024);
792 for (int i=0; i<1000; i++) {
793 int n = sink.write(bb);
794 assertTrue(n > 0);
795 bb.clear();
796 }
797 sink.close();
798
799 // wait for reader to finish
800 reader.join();
801 }
802 });
803 }
804
805 /**
806 * Pipe.SourceChannel close while virtual thread blocked in read.
807 */
808 @ParameterizedTest
809 @MethodSource("threadBuilders")
810 void testPipeReadAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
811 VThreadRunner.run(builder, () -> {
812 Pipe p = Pipe.open();
813 try (Pipe.SinkChannel sink = p.sink();
814 Pipe.SourceChannel source = p.source()) {
815 runAfterParkedAsync(source::close);
816 try {
817 int n = source.read(ByteBuffer.allocate(100));
818 fail("read returned " + n);
819 } catch (AsynchronousCloseException expected) { }
820 }
821 });
822 }
823
824 /**
825 * Virtual thread interrupted while blocked in Pipe.SourceChannel read.
826 */
827 @ParameterizedTest
828 @MethodSource("threadBuilders")
829 void testPipeReadInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
830 VThreadRunner.run(builder, () -> {
831 Pipe p = Pipe.open();
832 try (Pipe.SinkChannel sink = p.sink();
833 Pipe.SourceChannel source = p.source()) {
834
835 // interrupt current thread when it blocks reading from source
836 Thread thisThread = Thread.currentThread();
837 runAfterParkedAsync(thisThread::interrupt);
838
839 try {
840 int n = source.read(ByteBuffer.allocate(100));
841 fail("read returned " + n);
842 } catch (ClosedByInterruptException expected) {
843 assertTrue(Thread.interrupted());
844 }
845 }
846 });
847 }
848
849 /**
850 * Pipe.SinkChannel close while virtual thread blocked in write.
851 */
852 @ParameterizedTest
853 @MethodSource("threadBuilders")
854 void testPipeWriteAsyncClose(Thread.Builder.OfVirtual builder) throws Exception {
855 VThreadRunner.run(builder, () -> {
856 boolean retry = true;
857 while (retry) {
858 Pipe p = Pipe.open();
859 try (Pipe.SinkChannel sink = p.sink();
860 Pipe.SourceChannel source = p.source()) {
861
862 // close sink when current thread blocks in write
863 runAfterParkedAsync(sink::close);
864 try {
865 ByteBuffer bb = ByteBuffer.allocate(100*1024);
866 for (;;) {
867 int n = sink.write(bb);
868 assertTrue(n > 0);
869 bb.clear();
870 }
871 } catch (AsynchronousCloseException e) {
872 // closed when blocked in write
873 retry = false;
874 } catch (ClosedChannelException e) {
875 // closed when not blocked in write, need to retry test
876 }
877 }
878 }
879 });
880 }
881
882 /**
883 * Virtual thread interrupted while blocked in Pipe.SinkChannel write.
884 */
885 @ParameterizedTest
886 @MethodSource("threadBuilders")
887 void testPipeWriteInterrupt(Thread.Builder.OfVirtual builder) throws Exception {
888 VThreadRunner.run(builder, () -> {
889 boolean retry = true;
890 while (retry) {
891 Pipe p = Pipe.open();
892 try (Pipe.SinkChannel sink = p.sink();
893 Pipe.SourceChannel source = p.source()) {
894
895 // interrupt current thread when it blocks in write
896 Thread thisThread = Thread.currentThread();
897 runAfterParkedAsync(thisThread::interrupt);
898
899 try {
900 ByteBuffer bb = ByteBuffer.allocate(100*1024);
901 for (;;) {
902 int n = sink.write(bb);
903 assertTrue(n > 0);
904 bb.clear();
905 }
906 } catch (ClosedByInterruptException expected) {
907 // closed when blocked in write
908 assertTrue(Thread.interrupted());
909 retry = false;
910 } catch (ClosedChannelException e) {
911 // closed when not blocked in write, need to retry test
912 }
913 }
914 }
915 });
916 }
917
918 /**
919 * Creates a loopback connection
920 */
921 static class Connection implements Closeable {
922 private final SocketChannel sc1;
923 private final SocketChannel sc2;
924 Connection() throws IOException {
925 var lh = InetAddress.getLoopbackAddress();
926 try (var listener = ServerSocketChannel.open()) {
927 listener.bind(new InetSocketAddress(lh, 0));
928 SocketChannel sc1 = SocketChannel.open();
929 SocketChannel sc2 = null;
930 try {
931 sc1.socket().connect(listener.getLocalAddress());
932 sc2 = listener.accept();
933 } catch (IOException ioe) {
934 sc1.close();
935 throw ioe;
936 }
937 this.sc1 = sc1;
938 this.sc2 = sc2;
939 }
940 }
941 SocketChannel channel1() {
942 return sc1;
943 }
944 SocketChannel channel2() {
945 return sc2;
946 }
947 @Override
948 public void close() throws IOException {
949 sc1.close();
950 sc2.close();
951 }
952 }
953
954 /**
955 * Read from a channel until all bytes have been read or an I/O error occurs.
956 */
957 static void readToEOF(ReadableByteChannel rbc) throws IOException {
958 ByteBuffer bb = ByteBuffer.allocate(16*1024);
959 int n;
960 while ((n = rbc.read(bb)) > 0) {
961 bb.clear();
962 }
963 }
964
965 @FunctionalInterface
966 interface ThrowingRunnable {
967 void run() throws Exception;
968 }
969
970 /**
971 * Runs the given task asynchronously after the current virtual thread has parked.
972 * @return the thread started to run the task
973 */
974 static Thread runAfterParkedAsync(ThrowingRunnable task) {
975 Thread target = Thread.currentThread();
976 if (!target.isVirtual())
977 throw new WrongThreadException();
978 return Thread.ofPlatform().daemon().start(() -> {
979 try {
980 Thread.State state = target.getState();
981 while (state != Thread.State.WAITING
982 && state != Thread.State.TIMED_WAITING) {
983 Thread.sleep(20);
984 state = target.getState();
985 }
986 Thread.sleep(20); // give a bit more time to release carrier
987 task.run();
988 } catch (Exception e) {
989 e.printStackTrace();
990 }
991 });
992 }
993 }