1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 8201315
* @summary Test that channels can be registered, interest ops can changed,
* and keys cancelled while a selection operation is in progress.
*/
import java.io.IOException;
import java.nio.channels.ClosedSelectorException;
import java.nio.channels.Pipe;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.Phaser;
public class RegisterDuringSelect {
static Callable<Void> selectLoop(Selector sel, Phaser barrier) {
return new Callable<Void>() {
@Override
public Void call() throws IOException {
for (;;) {
try {
sel.select();
} catch (ClosedSelectorException ignore) {
return null;
}
if (sel.isOpen()) {
barrier.arriveAndAwaitAdvance();
System.out.println("selectLoop advanced ...");
} else {
// closed
return null;
}
}
}
};
}
/**
* Invoke register, interestOps, and cancel concurrently with a thread
* doing a selection operation
*/
public static void main(String args[]) throws Exception {
Future<Void> result;
ExecutorService pool = Executors.newFixedThreadPool(1);
try (Selector sel = Selector.open()) {
Phaser barrier = new Phaser(2);
// submit task to do the select loop
result = pool.submit(selectLoop(sel, barrier));
Pipe p = Pipe.open();
try {
Pipe.SourceChannel sc = p.source();
sc.configureBlocking(false);
System.out.println("register ...");
SelectionKey key = sc.register(sel, SelectionKey.OP_READ);
if (!sel.keys().contains(key))
throw new RuntimeException("key not in key set");
sel.wakeup();
barrier.arriveAndAwaitAdvance();
System.out.println("interestOps ...");
key.interestOps(0);
sel.wakeup();
barrier.arriveAndAwaitAdvance();
System.out.println("cancel ...");
key.cancel();
sel.wakeup();
barrier.arriveAndAwaitAdvance();
if (sel.keys().contains(key))
throw new RuntimeException("key not removed from key set");
} finally {
p.source().close();
p.sink().close();
}
} finally {
pool.shutdown();
}
// ensure selectLoop completes without exception
result.get();
}
}
|
