6766
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 7194254
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27 * @summary Creates several threads with different java priorities and checks
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28 * whether jstack reports correct priorities for them.
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29 *
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30 * @run main T7194254
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31 */
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32
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33 import java.io.BufferedReader;
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34 import java.io.InputStreamReader;
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35 import java.lang.management.ManagementFactory;
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36 import java.lang.management.RuntimeMXBean;
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37 import java.util.ArrayList;
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38 import java.util.List;
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39 import java.util.concurrent.CyclicBarrier;
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40 import java.util.regex.Matcher;
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41 import java.util.regex.Pattern;
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42
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43 public class Test7194254 {
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44
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45 public static void main(String[] args) throws Exception {
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46 final int NUMBER_OF_JAVA_PRIORITIES =
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47 Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1;
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48 final CyclicBarrier barrier =
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49 new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1);
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50
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51 for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) {
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52 final int priority = p;
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53 new Thread("Priority=" + p) {
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54 {
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55 setPriority(priority);
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56 }
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57 public void run() {
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58 try {
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59 barrier.await(); // 1st
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60 barrier.await(); // 2nd
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61 } catch (Exception exc) {
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62 // ignore
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63 }
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64 }
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65 }.start();
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66 }
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67 barrier.await(); // 1st
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68
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69 int matches = 0;
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70 List<String> failed = new ArrayList<>();
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71 try {
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72 String pid = getPid();
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73 String jstack = System.getProperty("java.home") + "/../bin/jstack";
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74 Process process = new ProcessBuilder(jstack, pid)
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75 .redirectErrorStream(true).start();
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76 Pattern pattern = Pattern.compile(
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77 "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");
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78 try (BufferedReader reader = new BufferedReader(
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79 new InputStreamReader(process.getInputStream()))) {
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80 String line;
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81 while((line = reader.readLine()) != null) {
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82 Matcher matcher = pattern.matcher(line);
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83 if (matcher.matches()) {
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84 matches += 1;
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85 String expected = matcher.group(1);
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86 String actual = matcher.group(2);
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87 if (!expected.equals(actual)) {
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88 failed.add(line);
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89 }
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90 }
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91 }
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92 }
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93 barrier.await(); // 2nd
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94 } finally {
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95 barrier.reset();
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96 }
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97
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98 if (matches != NUMBER_OF_JAVA_PRIORITIES) {
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99 throw new AssertionError("matches: expected " +
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100 NUMBER_OF_JAVA_PRIORITIES + ", but was " + matches);
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101 }
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102 if (!failed.isEmpty()) {
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103 throw new AssertionError(failed.size() + ":" + failed);
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104 }
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105 System.out.println("Test passes.");
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106 }
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107
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108 static String getPid() {
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109 RuntimeMXBean runtimebean = ManagementFactory.getRuntimeMXBean();
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110 String vmname = runtimebean.getName();
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111 int i = vmname.indexOf('@');
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112 if (i != -1) {
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113 vmname = vmname.substring(0, i);
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114 }
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115 return vmname;
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116 }
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117
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118 }
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119
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