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