ThreadPriorities.java revision 8359:ed6389f70257 
1/*
2 * Copyright (c) 2012, 2015, 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
26 * @bug     7194254
27 * @summary Creates several threads with different java priorities and checks
28 *      whether jstack reports correct priorities for them.
29 *
30 * @library /testlibrary
31 * @modules java.base/sun.misc
32 *          java.management
33 * @run main ThreadPriorities
34 */
35
36import java.util.ArrayList;
37import java.util.concurrent.CyclicBarrier;
38import java.util.regex.Matcher;
39import java.util.regex.Pattern;
40
41import jdk.test.lib.*;
42import static jdk.test.lib.Asserts.*;
43
44public class ThreadPriorities {
45
46    public static void main(String[] args) throws Throwable {
47        final int NUMBER_OF_JAVA_PRIORITIES =
48                Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1;
49        final CyclicBarrier barrier =
50                new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1);
51
52        for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) {
53            final int priority = p;
54            new Thread("Priority=" + p) {
55                {
56                    setPriority(priority);
57                }
58                public void run() {
59                    try {
60                        barrier.await(); // 1st
61                        barrier.await(); // 2nd
62                    } catch (Exception exc) {
63                        // ignore
64                    }
65                }
66            }.start();
67        }
68        barrier.await(); // 1st
69
70        int matches = 0;
71        ArrayList<String> failed = new ArrayList<>();
72        ProcessBuilder pb = new ProcessBuilder(
73                JDKToolFinder.getJDKTool("jstack"),
74                String.valueOf(ProcessTools.getProcessId()));
75
76        String[] output = new OutputAnalyzer(pb.start()).getOutput().split("\\n+");
77
78        Pattern pattern = Pattern.compile(
79                "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");
80        for (String line : output) {
81            Matcher matcher = pattern.matcher(line);
82            if (matcher.matches()) {
83                matches += 1;
84                String expected = matcher.group(1);
85                String actual = matcher.group(2);
86                if (!expected.equals(actual)) {
87                    failed.add(line);
88                }
89            }
90        }
91        barrier.await(); // 2nd
92        barrier.reset();
93
94        assertEquals(matches, NUMBER_OF_JAVA_PRIORITIES);
95        assertTrue(failed.isEmpty(), failed.size() + ":" + failed);
96    }
97}
98
99