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