1 /*
2 * Copyright (c) 2018, 2025, 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/timeout=480 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/timeout=480 -Djdk.pollerMode=1 BlockingChannelOps
37 * @run junit/othervm/timeout=480 -Djdk.pollerMode=2 BlockingChannelOps
38 */
39
40 /*
41 * @test id=no-vmcontinuations
42 * @requires vm.continuations
43 * @library /test/lib
44 * @run junit/othervm/timeout=480 -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.locks.LockSupport;
66
67 import jdk.test.lib.thread.VThreadRunner;
68 import org.junit.jupiter.api.Test;
69 import org.junit.jupiter.params.ParameterizedTest;
70 import org.junit.jupiter.params.provider.ValueSource;
71 import static org.junit.jupiter.api.Assertions.*;
72
73 class BlockingChannelOps {
74
75 /**
76 * SocketChannel read/write, no blocking.
77 */
78 @Test
79 void testSocketChannelReadWrite1() throws Exception {
80 VThreadRunner.run(() -> {
81 try (var connection = new Connection()) {
82 SocketChannel sc1 = connection.channel1();
83 SocketChannel sc2 = connection.channel2();
84
85 // write to sc1
86 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
87 int n = sc1.write(bb);
88 assertTrue(n > 0);
89
90 // read from sc2 should not block
91 bb = ByteBuffer.allocate(10);
92 n = sc2.read(bb);
93 assertTrue(n > 0);
94 assertTrue(bb.get(0) == 'X');
95 }
96 });
97 }
98
99 /**
100 * Virtual thread blocks in SocketChannel read.
101 */
102 @Test
103 void testSocketChannelRead() throws Exception {
104 VThreadRunner.run(() -> {
105 try (var connection = new Connection()) {
106 SocketChannel sc1 = connection.channel1();
107 SocketChannel sc2 = connection.channel2();
108
109 // write to sc1 when current thread blocks in sc2.read
110 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
111 runAfterParkedAsync(() -> sc1.write(bb1));
112
113 // read from sc2 should block
114 ByteBuffer bb2 = ByteBuffer.allocate(10);
115 int n = sc2.read(bb2);
116 assertTrue(n > 0);
117 assertTrue(bb2.get(0) == 'X');
118 }
119 });
120 }
121
122 /**
123 * Virtual thread blocks in SocketChannel write.
124 */
125 @Test
126 void testSocketChannelWrite() throws Exception {
127 VThreadRunner.run(() -> {
128 try (var connection = new Connection()) {
129 SocketChannel sc1 = connection.channel1();
130 SocketChannel sc2 = connection.channel2();
131
132 // read from sc2 to EOF when current thread blocks in sc1.write
133 Thread reader = runAfterParkedAsync(() -> readToEOF(sc2));
134
135 // write to sc1 should block
136 ByteBuffer bb = ByteBuffer.allocate(100*1024);
137 for (int i=0; i<1000; i++) {
138 int n = sc1.write(bb);
139 assertTrue(n > 0);
140 bb.clear();
141 }
142 sc1.close();
143
144 // wait for reader to finish
145 reader.join();
146 }
147 });
148 }
149
150 /**
151 * SocketChannel close while virtual thread blocked in read.
152 */
153 @Test
154 void testSocketChannelReadAsyncClose() throws Exception {
155 VThreadRunner.run(() -> {
156 try (var connection = new Connection()) {
157 SocketChannel sc = connection.channel1();
158 runAfterParkedAsync(sc::close);
159 try {
160 int n = sc.read(ByteBuffer.allocate(100));
161 fail("read returned " + n);
162 } catch (AsynchronousCloseException expected) { }
163 }
164 });
165 }
166
167 /**
168 * SocketChannel shutdownInput while virtual thread blocked in read.
169 */
170 @Test
171 void testSocketChannelReadAsyncShutdownInput() throws Exception {
172 VThreadRunner.run(() -> {
173 try (var connection = new Connection()) {
174 SocketChannel sc = connection.channel1();
175 runAfterParkedAsync(sc::shutdownInput);
176 int n = sc.read(ByteBuffer.allocate(100));
177 assertEquals(-1, n);
178 assertTrue(sc.isOpen());
179 }
180 });
181 }
182
183 /**
184 * Virtual thread interrupted while blocked in SocketChannel read.
185 */
186 @Test
187 void testSocketChannelReadInterrupt() throws Exception {
188 VThreadRunner.run(() -> {
189 try (var connection = new Connection()) {
190 SocketChannel sc = connection.channel1();
191
192 // interrupt current thread when it blocks in read
193 Thread thisThread = Thread.currentThread();
194 runAfterParkedAsync(thisThread::interrupt);
195
196 try {
197 int n = sc.read(ByteBuffer.allocate(100));
198 fail("read returned " + n);
199 } catch (ClosedByInterruptException expected) {
200 assertTrue(Thread.interrupted());
201 }
202 }
203 });
204 }
205
206 /**
207 * SocketChannel close while virtual thread blocked in write.
208 */
209 @Test
210 void testSocketChannelWriteAsyncClose() throws Exception {
211 VThreadRunner.run(() -> {
212 boolean done = false;
213 while (!done) {
214 try (var connection = new Connection()) {
215 SocketChannel sc = connection.channel1();
216
217 // close sc when current thread blocks in write
218 runAfterParkedAsync(sc::close, true);
219
220 // write until channel is closed
221 try {
222 ByteBuffer bb = ByteBuffer.allocate(100*1024);
223 for (;;) {
224 int n = sc.write(bb);
225 assertTrue(n > 0);
226 bb.clear();
227 }
228 } catch (AsynchronousCloseException expected) {
229 // closed when blocked in write
230 done = true;
231 } catch (ClosedChannelException e) {
232 // closed but not blocked in write, need to retry test
233 System.err.format("%s, need to retry!%n", e);
234 }
235 }
236 }
237 });
238 }
239
240
241 /**
242 * SocketChannel shutdownOutput while virtual thread blocked in write.
243 */
244 @Test
245 void testSocketChannelWriteAsyncShutdownOutput() throws Exception {
246 VThreadRunner.run(() -> {
247 try (var connection = new Connection()) {
248 SocketChannel sc = connection.channel1();
249
250 // shutdown output when current thread blocks in write
251 runAfterParkedAsync(sc::shutdownOutput);
252 try {
253 ByteBuffer bb = ByteBuffer.allocate(100*1024);
254 for (;;) {
255 int n = sc.write(bb);
256 assertTrue(n > 0);
257 bb.clear();
258 }
259 } catch (ClosedChannelException e) {
260 // expected
261 }
262 assertTrue(sc.isOpen());
263 }
264 });
265 }
266
267 /**
268 * Virtual thread interrupted while blocked in SocketChannel write.
269 */
270 @Test
271 void testSocketChannelWriteInterrupt() throws Exception {
272 VThreadRunner.run(() -> {
273 boolean done = false;
274 while (!done) {
275 try (var connection = new Connection()) {
276 SocketChannel sc = connection.channel1();
277
278 // interrupt current thread when it blocks in write
279 Thread thisThread = Thread.currentThread();
280 runAfterParkedAsync(thisThread::interrupt, true);
281
282 // write until channel is closed
283 try {
284 ByteBuffer bb = ByteBuffer.allocate(100*1024);
285 for (;;) {
286 int n = sc.write(bb);
287 assertTrue(n > 0);
288 bb.clear();
289 }
290 } catch (ClosedByInterruptException e) {
291 // closed when blocked in write
292 assertTrue(Thread.interrupted());
293 done = true;
294 } catch (ClosedChannelException e) {
295 // closed but not blocked in write, need to retry test
296 System.err.format("%s, need to retry!%n", e);
297 }
298 }
299 }
300 });
301 }
302
303 /**
304 * Virtual thread blocks in SocketChannel adaptor read.
305 */
306 @ParameterizedTest
307 @ValueSource(ints = { 0, 60_000 })
308 void testSocketAdaptorRead(int timeout) throws Exception {
309 VThreadRunner.run(() -> {
310 try (var connection = new Connection()) {
311 SocketChannel sc1 = connection.channel1();
312 SocketChannel sc2 = connection.channel2();
313
314 // write to sc1 when currnet thread blocks reading from sc2
315 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
316 runAfterParkedAsync(() -> sc1.write(bb));
317
318 // read from sc2 should block
319 byte[] array = new byte[100];
320 if (timeout > 0)
321 sc2.socket().setSoTimeout(timeout);
322 int n = sc2.socket().getInputStream().read(array);
323 assertTrue(n > 0);
324 assertTrue(array[0] == 'X');
325 }
326 });
327 }
328
329 /**
330 * ServerSocketChannel accept, no blocking.
331 */
332 @Test
333 void testServerSocketChannelAccept1() throws Exception {
334 VThreadRunner.run(() -> {
335 try (var ssc = ServerSocketChannel.open()) {
336 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
337 var sc1 = SocketChannel.open(ssc.getLocalAddress());
338 // accept should not block
339 var sc2 = ssc.accept();
340 sc1.close();
341 sc2.close();
342 }
343 });
344 }
345
346 /**
347 * Virtual thread blocks in ServerSocketChannel accept.
348 */
349 @Test
350 void testServerSocketChannelAccept2() throws Exception {
351 VThreadRunner.run(() -> {
352 try (var ssc = ServerSocketChannel.open()) {
353 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
354 var sc1 = SocketChannel.open();
355
356 // connect when current thread when it blocks in accept
357 runAfterParkedAsync(() -> sc1.connect(ssc.getLocalAddress()));
358
359 // accept should block
360 var sc2 = ssc.accept();
361 sc1.close();
362 sc2.close();
363 }
364 });
365 }
366
367 /**
368 * SeverSocketChannel close while virtual thread blocked in accept.
369 */
370 @Test
371 void testServerSocketChannelAcceptAsyncClose() throws Exception {
372 VThreadRunner.run(() -> {
373 try (var ssc = ServerSocketChannel.open()) {
374 InetAddress lh = InetAddress.getLoopbackAddress();
375 ssc.bind(new InetSocketAddress(lh, 0));
376 runAfterParkedAsync(ssc::close);
377 try {
378 SocketChannel sc = ssc.accept();
379 sc.close();
380 fail("connection accepted???");
381 } catch (AsynchronousCloseException expected) { }
382 }
383 });
384 }
385
386 /**
387 * Virtual thread interrupted while blocked in ServerSocketChannel accept.
388 */
389 @Test
390 void testServerSocketChannelAcceptInterrupt() throws Exception {
391 VThreadRunner.run(() -> {
392 try (var ssc = ServerSocketChannel.open()) {
393 InetAddress lh = InetAddress.getLoopbackAddress();
394 ssc.bind(new InetSocketAddress(lh, 0));
395
396 // interrupt current thread when it blocks in accept
397 Thread thisThread = Thread.currentThread();
398 runAfterParkedAsync(thisThread::interrupt);
399
400 try {
401 SocketChannel sc = ssc.accept();
402 sc.close();
403 fail("connection accepted???");
404 } catch (ClosedByInterruptException expected) {
405 assertTrue(Thread.interrupted());
406 }
407 }
408 });
409 }
410
411 /**
412 * Virtual thread blocks in ServerSocketChannel adaptor accept.
413 */
414 @ParameterizedTest
415 @ValueSource(ints = { 0, 60_000 })
416 void testSocketChannelAdaptorAccept(int timeout) throws Exception {
417 VThreadRunner.run(() -> {
418 try (var ssc = ServerSocketChannel.open()) {
419 ssc.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
420 var sc = SocketChannel.open();
421
422 // interrupt current thread when it blocks in accept
423 runAfterParkedAsync(() -> sc.connect(ssc.getLocalAddress()));
424
425 // accept should block
426 if (timeout > 0)
427 ssc.socket().setSoTimeout(timeout);
428 Socket s = ssc.socket().accept();
429 sc.close();
430 s.close();
431 }
432 });
433 }
434
435 /**
436 * DatagramChannel receive/send, no blocking.
437 */
438 @Test
439 void testDatagramChannelSendReceive1() throws Exception {
440 VThreadRunner.run(() -> {
441 try (DatagramChannel dc1 = DatagramChannel.open();
442 DatagramChannel dc2 = DatagramChannel.open()) {
443
444 InetAddress lh = InetAddress.getLoopbackAddress();
445 dc2.bind(new InetSocketAddress(lh, 0));
446
447 // send should not block
448 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
449 int n = dc1.send(bb, dc2.getLocalAddress());
450 assertTrue(n > 0);
451
452 // receive should not block
453 bb = ByteBuffer.allocate(10);
454 dc2.receive(bb);
455 assertTrue(bb.get(0) == 'X');
456 }
457 });
458 }
459
460 /**
461 * Virtual thread blocks in DatagramChannel receive.
462 */
463 @Test
464 void testDatagramChannelSendReceive2() throws Exception {
465 VThreadRunner.run(() -> {
466 try (DatagramChannel dc1 = DatagramChannel.open();
467 DatagramChannel dc2 = DatagramChannel.open()) {
468
469 InetAddress lh = InetAddress.getLoopbackAddress();
470 dc2.bind(new InetSocketAddress(lh, 0));
471
472 // send from dc1 when current thread blocked in dc2.receive
473 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
474 runAfterParkedAsync(() -> dc1.send(bb1, dc2.getLocalAddress()));
475
476 // read from dc2 should block
477 ByteBuffer bb2 = ByteBuffer.allocate(10);
478 dc2.receive(bb2);
479 assertTrue(bb2.get(0) == 'X');
480 }
481 });
482 }
483
484 /**
485 * DatagramChannel close while virtual thread blocked in receive.
486 */
487 @Test
488 void testDatagramChannelReceiveAsyncClose() throws Exception {
489 VThreadRunner.run(() -> {
490 try (DatagramChannel dc = DatagramChannel.open()) {
491 InetAddress lh = InetAddress.getLoopbackAddress();
492 dc.bind(new InetSocketAddress(lh, 0));
493 runAfterParkedAsync(dc::close);
494 try {
495 dc.receive(ByteBuffer.allocate(100));
496 fail("receive returned");
497 } catch (AsynchronousCloseException expected) { }
498 }
499 });
500 }
501
502 /**
503 * Virtual thread interrupted while blocked in DatagramChannel receive.
504 */
505 @Test
506 void testDatagramChannelReceiveInterrupt() throws Exception {
507 VThreadRunner.run(() -> {
508 try (DatagramChannel dc = DatagramChannel.open()) {
509 InetAddress lh = InetAddress.getLoopbackAddress();
510 dc.bind(new InetSocketAddress(lh, 0));
511
512 // interrupt current thread when it blocks in receive
513 Thread thisThread = Thread.currentThread();
514 runAfterParkedAsync(thisThread::interrupt);
515
516 try {
517 dc.receive(ByteBuffer.allocate(100));
518 fail("receive returned");
519 } catch (ClosedByInterruptException expected) {
520 assertTrue(Thread.interrupted());
521 }
522 }
523 });
524 }
525
526 /**
527 * Virtual thread blocks in DatagramSocket adaptor receive.
528 */
529 @ParameterizedTest
530 @ValueSource(ints = { 0, 60_000 })
531 void testDatagramSocketAdaptorReceive(int timeout) throws Exception {
532 VThreadRunner.run(() -> {
533 try (DatagramChannel dc1 = DatagramChannel.open();
534 DatagramChannel dc2 = DatagramChannel.open()) {
535
536 InetAddress lh = InetAddress.getLoopbackAddress();
537 dc2.bind(new InetSocketAddress(lh, 0));
538
539 // send from dc1 when current thread blocks in dc2 receive
540 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
541 runAfterParkedAsync(() -> dc1.send(bb, dc2.getLocalAddress()));
542
543 // receive should block
544 byte[] array = new byte[100];
545 DatagramPacket p = new DatagramPacket(array, 0, array.length);
546 if (timeout > 0)
547 dc2.socket().setSoTimeout(timeout);
548 dc2.socket().receive(p);
549 assertTrue(p.getLength() == 3 && array[0] == 'X');
550 }
551 });
552 }
553
554 /**
555 * DatagramChannel close while virtual thread blocked in adaptor receive.
556 */
557 @ParameterizedTest
558 @ValueSource(ints = { 0, 60_000 })
559 void testDatagramSocketAdaptorReceiveAsyncClose(int timeout) throws Exception {
560 VThreadRunner.run(() -> {
561 try (DatagramChannel dc = DatagramChannel.open()) {
562 InetAddress lh = InetAddress.getLoopbackAddress();
563 dc.bind(new InetSocketAddress(lh, 0));
564
565 byte[] array = new byte[100];
566 DatagramPacket p = new DatagramPacket(array, 0, array.length);
567 if (timeout > 0)
568 dc.socket().setSoTimeout(timeout);
569
570 // close channel/socket when current thread blocks in receive
571 runAfterParkedAsync(dc::close);
572
573 assertThrows(SocketException.class, () -> dc.socket().receive(p));
574 }
575 });
576 }
577
578 /**
579 * Virtual thread interrupted while blocked in DatagramSocket adaptor receive.
580 */
581 @ParameterizedTest
582 @ValueSource(ints = { 0, 60_000 })
583 void testDatagramSocketAdaptorReceiveInterrupt(int timeout) throws Exception {
584 VThreadRunner.run(() -> {
585 try (DatagramChannel dc = DatagramChannel.open()) {
586 InetAddress lh = InetAddress.getLoopbackAddress();
587 dc.bind(new InetSocketAddress(lh, 0));
588
589 byte[] array = new byte[100];
590 DatagramPacket p = new DatagramPacket(array, 0, array.length);
591 if (timeout > 0)
592 dc.socket().setSoTimeout(timeout);
593
594 // interrupt current thread when it blocks in receive
595 Thread thisThread = Thread.currentThread();
596 runAfterParkedAsync(thisThread::interrupt);
597
598 try {
599 dc.socket().receive(p);
600 fail();
601 } catch (ClosedByInterruptException expected) {
602 assertTrue(Thread.interrupted());
603 }
604 }
605 });
606 }
607
608 /**
609 * Pipe read/write, no blocking.
610 */
611 @Test
612 void testPipeReadWrite1() throws Exception {
613 VThreadRunner.run(() -> {
614 Pipe p = Pipe.open();
615 try (Pipe.SinkChannel sink = p.sink();
616 Pipe.SourceChannel source = p.source()) {
617
618 // write should not block
619 ByteBuffer bb = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
620 int n = sink.write(bb);
621 assertTrue(n > 0);
622
623 // read should not block
624 bb = ByteBuffer.allocate(10);
625 n = source.read(bb);
626 assertTrue(n > 0);
627 assertTrue(bb.get(0) == 'X');
628 }
629 });
630 }
631
632 /**
633 * Virtual thread blocks in Pipe.SourceChannel read.
634 */
635 @Test
636 void testPipeReadWrite2() throws Exception {
637 VThreadRunner.run(() -> {
638 Pipe p = Pipe.open();
639 try (Pipe.SinkChannel sink = p.sink();
640 Pipe.SourceChannel source = p.source()) {
641
642 // write from sink when current thread blocks reading from source
643 ByteBuffer bb1 = ByteBuffer.wrap("XXX".getBytes("UTF-8"));
644 runAfterParkedAsync(() -> sink.write(bb1));
645
646 // read should block
647 ByteBuffer bb2 = ByteBuffer.allocate(10);
648 int n = source.read(bb2);
649 assertTrue(n > 0);
650 assertTrue(bb2.get(0) == 'X');
651 }
652 });
653 }
654
655 /**
656 * Virtual thread blocks in Pipe.SinkChannel write.
657 */
658 @Test
659 void testPipeReadWrite3() throws Exception {
660 VThreadRunner.run(() -> {
661 Pipe p = Pipe.open();
662 try (Pipe.SinkChannel sink = p.sink();
663 Pipe.SourceChannel source = p.source()) {
664
665 // read from source to EOF when current thread blocking in write
666 Thread reader = runAfterParkedAsync(() -> readToEOF(source));
667
668 // write to sink should block
669 ByteBuffer bb = ByteBuffer.allocate(100*1024);
670 for (int i=0; i<1000; i++) {
671 int n = sink.write(bb);
672 assertTrue(n > 0);
673 bb.clear();
674 }
675 sink.close();
676
677 // wait for reader to finish
678 reader.join();
679 }
680 });
681 }
682
683 /**
684 * Pipe.SourceChannel close while virtual thread blocked in read.
685 */
686 @Test
687 void testPipeReadAsyncClose() throws Exception {
688 VThreadRunner.run(() -> {
689 Pipe p = Pipe.open();
690 try (Pipe.SinkChannel sink = p.sink();
691 Pipe.SourceChannel source = p.source()) {
692 runAfterParkedAsync(source::close);
693 try {
694 int n = source.read(ByteBuffer.allocate(100));
695 fail("read returned " + n);
696 } catch (AsynchronousCloseException expected) { }
697 }
698 });
699 }
700
701 /**
702 * Virtual thread interrupted while blocked in Pipe.SourceChannel read.
703 */
704 @Test
705 void testPipeReadInterrupt() throws Exception {
706 VThreadRunner.run(() -> {
707 Pipe p = Pipe.open();
708 try (Pipe.SinkChannel sink = p.sink();
709 Pipe.SourceChannel source = p.source()) {
710
711 // interrupt current thread when it blocks reading from source
712 Thread thisThread = Thread.currentThread();
713 runAfterParkedAsync(thisThread::interrupt);
714
715 try {
716 int n = source.read(ByteBuffer.allocate(100));
717 fail("read returned " + n);
718 } catch (ClosedByInterruptException expected) {
719 assertTrue(Thread.interrupted());
720 }
721 }
722 });
723 }
724
725 /**
726 * Pipe.SinkChannel close while virtual thread blocked in write.
727 */
728 @Test
729 void testPipeWriteAsyncClose() throws Exception {
730 VThreadRunner.run(() -> {
731 boolean done = false;
732 while (!done) {
733 Pipe p = Pipe.open();
734 try (Pipe.SinkChannel sink = p.sink();
735 Pipe.SourceChannel source = p.source()) {
736
737 // close sink when current thread blocks in write
738 runAfterParkedAsync(sink::close, true);
739
740 // write until channel is closed
741 try {
742 ByteBuffer bb = ByteBuffer.allocate(100*1024);
743 for (;;) {
744 int n = sink.write(bb);
745 assertTrue(n > 0);
746 bb.clear();
747 }
748 } catch (AsynchronousCloseException e) {
749 // closed when blocked in write
750 done = true;
751 } catch (ClosedChannelException e) {
752 // closed but not blocked in write, need to retry test
753 System.err.format("%s, need to retry!%n", e);
754 }
755 }
756 }
757 });
758 }
759
760 /**
761 * Virtual thread interrupted while blocked in Pipe.SinkChannel write.
762 */
763 @Test
764 void testPipeWriteInterrupt() throws Exception {
765 VThreadRunner.run(() -> {
766 boolean done = false;
767 while (!done) {
768 Pipe p = Pipe.open();
769 try (Pipe.SinkChannel sink = p.sink();
770 Pipe.SourceChannel source = p.source()) {
771
772 // interrupt current thread when it blocks in write
773 Thread thisThread = Thread.currentThread();
774 runAfterParkedAsync(thisThread::interrupt, true);
775
776 // write until channel is closed
777 try {
778 ByteBuffer bb = ByteBuffer.allocate(100*1024);
779 for (;;) {
780 int n = sink.write(bb);
781 assertTrue(n > 0);
782 bb.clear();
783 }
784 } catch (ClosedByInterruptException expected) {
785 // closed when blocked in write
786 assertTrue(Thread.interrupted());
787 done = true;
788 } catch (ClosedChannelException e) {
789 // closed but not blocked in write, need to retry test
790 System.err.format("%s, need to retry!%n", e);
791 }
792 }
793 }
794 });
795 }
796
797 /**
798 * Creates a loopback connection
799 */
800 static class Connection implements Closeable {
801 private final SocketChannel sc1;
802 private final SocketChannel sc2;
803 Connection() throws IOException {
804 var lh = InetAddress.getLoopbackAddress();
805 try (var listener = ServerSocketChannel.open()) {
806 listener.bind(new InetSocketAddress(lh, 0));
807 SocketChannel sc1 = SocketChannel.open();
808 SocketChannel sc2 = null;
809 try {
810 sc1.socket().connect(listener.getLocalAddress());
811 sc2 = listener.accept();
812 } catch (IOException ioe) {
813 sc1.close();
814 throw ioe;
815 }
816 this.sc1 = sc1;
817 this.sc2 = sc2;
818 }
819 }
820 SocketChannel channel1() {
821 return sc1;
822 }
823 SocketChannel channel2() {
824 return sc2;
825 }
826 @Override
827 public void close() throws IOException {
828 sc1.close();
829 sc2.close();
830 }
831 }
832
833 /**
834 * Read from a channel until all bytes have been read or an I/O error occurs.
835 */
836 static void readToEOF(ReadableByteChannel rbc) throws IOException {
837 ByteBuffer bb = ByteBuffer.allocate(16*1024);
838 int n;
839 while ((n = rbc.read(bb)) > 0) {
840 bb.clear();
841 }
842 }
843
844 @FunctionalInterface
845 interface ThrowingRunnable {
846 void run() throws Exception;
847 }
848
849 /**
850 * Runs the given task asynchronously after the current virtual thread parks.
851 * @param writing if the thread will block in write
852 * @return the thread started to run the task
853 */
854 private static Thread runAfterParkedAsync(ThrowingRunnable task, boolean writing) {
855 Thread target = Thread.currentThread();
856 if (!target.isVirtual())
857 throw new WrongThreadException();
858 return Thread.ofPlatform().daemon().start(() -> {
859 try {
860 // wait for target thread to park
861 while (!isWaiting(target)) {
862 Thread.sleep(20);
863 }
864
865 // if the target thread is parked in write then we nudge it a few times
866 // to avoid wakeup with some bytes written
867 if (writing) {
868 for (int i = 0; i < 3; i++) {
869 LockSupport.unpark(target);
870 while (!isWaiting(target)) {
871 Thread.sleep(20);
872 }
873 }
874 }
875
876 task.run();
877
878 } catch (Exception e) {
879 e.printStackTrace();
880 }
881 });
882 }
883
884 private static Thread runAfterParkedAsync(ThrowingRunnable task) {
885 return runAfterParkedAsync(task, false);
886 }
887
888 /**
889 * Return true if the given Thread is parked.
890 */
891 private static boolean isWaiting(Thread target) {
892 Thread.State state = target.getState();
893 assertNotEquals(Thread.State.TERMINATED, state);
894 return (state == Thread.State.WAITING || state == Thread.State.TIMED_WAITING);
895 }
896 }