1 /*
   2  * Copyright (c) 2012, 2016, 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 /test/lib
  31  * @modules java.base/jdk.internal.misc
  32  *          java.management
  33  * @run main ThreadPriorities
  34  */
  35 
  36 import java.util.ArrayList;
  37 import java.util.concurrent.CyclicBarrier;
  38 import java.util.regex.Matcher;
  39 import java.util.regex.Pattern;
  40 
  41 import jdk.test.lib.process.ProcessTools;
  42 import jdk.test.lib.process.OutputAnalyzer;
  43 import jdk.test.lib.JDKToolFinder;
  44 import static jdk.test.lib.Asserts.*;
  45 
  46 public class ThreadPriorities {
  47 
  48     public static void main(String[] args) throws Throwable {
  49         final int NUMBER_OF_JAVA_PRIORITIES =
  50                 Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1;
  51         final CyclicBarrier barrier =
  52                 new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1);
  53 
  54         for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) {
  55             final int priority = p;
  56             new Thread("Priority=" + p) {
  57                 {
  58                     setPriority(priority);
  59                 }
  60                 public void run() {
  61                     try {
  62                         barrier.await(); // 1st
  63                         barrier.await(); // 2nd
  64                     } catch (Exception exc) {
  65                         // ignore
  66                     }
  67                 }
  68             }.start();
  69         }
  70         barrier.await(); // 1st
  71 
  72         int matches = 0;
  73         ArrayList<String> failed = new ArrayList<>();
  74         ProcessBuilder pb = new ProcessBuilder(
  75                 JDKToolFinder.getJDKTool("jstack"),
  76                 String.valueOf(ProcessTools.getProcessId()));
  77 
  78         String[] output = new OutputAnalyzer(pb.start()).getOutput().split("\\n+");
  79 
  80         Pattern pattern = Pattern.compile(
  81                 "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");
  82         for (String line : output) {
  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         barrier.await(); // 2nd
  94         barrier.reset();
  95 
  96         assertEquals(matches, NUMBER_OF_JAVA_PRIORITIES);
  97         assertTrue(failed.isEmpty(), failed.size() + ":" + failed);
  98     }
  99 }
 100