1 /*
   2  * Copyright (c) 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  * @summary Checks that jstack correctly prints the thread names
  27  * @modules java.base/jdk.internal.misc
  28  * @library /test/lib/share/classes
  29  * @library ../share
  30  * @build common.*
  31  *
  32  * @run main/othervm -XX:+UsePerfData ThreadNamesTest
  33  */
  34 import common.ToolResults;
  35 import utils.*;
  36 
  37 public class ThreadNamesTest {
  38 
  39     private static final String STRANGE_NAME = "-_?+!@#$%^*()";
  40     private static final String LONG_NAME = "loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong";
  41 
  42     static class NamedThread extends Thread {
  43 
  44         NamedThread(String name) {
  45             setName(name);
  46         }
  47 
  48         @Override
  49         public void run() {
  50             Utils.sleep();
  51         }
  52     }
  53 
  54     public static void main(String[] args) throws Exception {
  55         testWithName(STRANGE_NAME);
  56         testWithName("");
  57         testWithName(LONG_NAME);
  58     }
  59 
  60     private static void testWithName(String name) throws Exception {
  61         // Start a thread with some strange name
  62         NamedThread thread = new NamedThread(name);
  63         thread.start();
  64 
  65         // Run jstack tool and collect the output
  66         JstackTool jstackTool = new JstackTool(ProcessHandle.current().getPid());
  67         ToolResults results = jstackTool.measure();
  68 
  69         // Analyze the jstack output for the strange thread name
  70         JStack jstack1 = new DefaultFormat().parse(results.getStdoutString());
  71         ThreadStack ti1 = jstack1.getThreadStack(name);
  72 
  73         if (ti1 == null) {
  74             throw new RuntimeException("jstack output doesn't contain thread info for the thread '" + name + "'");
  75         }
  76     }
  77 
  78 }