1 /*
   2  * Copyright (c) 2012, 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  * @ignore 8060219
  31  * @run main Test7194254
  32  */
  33 
  34 import java.io.BufferedReader;
  35 import java.io.InputStreamReader;
  36 import java.lang.management.ManagementFactory;
  37 import java.lang.management.RuntimeMXBean;
  38 import java.util.ArrayList;
  39 import java.util.List;
  40 import java.util.concurrent.CyclicBarrier;
  41 import java.util.regex.Matcher;
  42 import java.util.regex.Pattern;
  43 
  44 public class Test7194254 {
  45 
  46     public static void main(String[] args) throws Exception {
  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         List<String> failed = new ArrayList<>();
  72         try {
  73             String pid = getPid();
  74             String jstack = System.getProperty("java.home") + "/../bin/jstack";
  75             Process process = new ProcessBuilder(jstack, pid)
  76                     .redirectErrorStream(true).start();
  77             Pattern pattern = Pattern.compile(
  78                     "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");
  79             try (BufferedReader reader = new BufferedReader(
  80                     new InputStreamReader(process.getInputStream()))) {
  81                 String line;
  82                 while((line = reader.readLine()) != null) {
  83                     Matcher matcher = pattern.matcher(line);
  84                     if (matcher.matches()) {
  85                         matches += 1;
  86                         String expected = matcher.group(1);
  87                         String actual = matcher.group(2);
  88                         if (!expected.equals(actual)) {
  89                             failed.add(line);
  90                         }
  91                     }
  92                 }
  93             }
  94             barrier.await(); // 2nd
  95         } finally {
  96             barrier.reset();
  97         }
  98 
  99         if (matches != NUMBER_OF_JAVA_PRIORITIES) {
 100             throw new AssertionError("matches: expected " +
 101                     NUMBER_OF_JAVA_PRIORITIES + ", but was " + matches);
 102         }
 103         if (!failed.isEmpty()) {
 104             throw new AssertionError(failed.size() + ":" + failed);
 105         }
 106         System.out.println("Test passes.");
 107     }
 108 
 109     static String getPid() {
 110         RuntimeMXBean runtimebean = ManagementFactory.getRuntimeMXBean();
 111         String vmname = runtimebean.getName();
 112         int i = vmname.indexOf('@');
 113         if (i != -1) {
 114             vmname = vmname.substring(0, i);
 115         }
 116         return vmname;
 117     }
 118 
 119 }
 120