1 /*
   2  * Copyright (c) 2018, 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 import java.lang.management.*;
  24 
  25 /*
  26  * @test
  27  * @bug     8205878 8206954
  28  * @requires os.family != "windows"
  29  * @summary Basic test of Thread and ThreadMXBean queries on a natively
  30  *          attached thread that has failed to detach before terminating.
  31  * @comment The native code only supports POSIX so no windows testing
  32  * @run main/othervm/native TestTerminatedThread
  33  */
  34 
  35 public class TestTerminatedThread {
  36 
  37     static native Thread createTerminatedThread();
  38 
  39     static {
  40         System.loadLibrary("terminatedThread");
  41     }
  42 
  43     private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
  44 
  45     public static void main(String[] args) throws Throwable {
  46 
  47         Thread t = createTerminatedThread();
  48 
  49         if (!t.isAlive())
  50             throw new Error("Thread is only supposed to terminate at native layer!");
  51 
  52         // Now invoke the various functions on this thread to
  53         // make sure the VM handles it okay. The focus is on
  54         // functions with an underlying native OS implementation.
  55         // Generally as long as we don't crash or throw unexpected
  56         // exceptions then the test passes. In some cases we know exactly
  57         // what a function should return and so can check that.
  58 
  59         System.out.println("Working with thread: " + t +
  60                            ",  in state: " + t.getState());
  61 
  62         System.out.println("Calling suspend ...");
  63         t.suspend();
  64         System.out.println("Calling resume ...");
  65         t.resume();
  66         System.out.println("Calling getStackTrace ...");
  67         StackTraceElement[] stack = t.getStackTrace();
  68         System.out.println(java.util.Arrays.toString(stack));
  69         if (stack.length != 0)
  70             throw new Error("Terminated thread should have empty java stack trace");
  71         System.out.println("Calling setName(\"NewName\") ...");
  72         t.setName("NewName");
  73         System.out.println("Calling interrupt ...");
  74         t.interrupt();
  75         System.out.println("Calling stop ...");
  76         t.stop();
  77 
  78         // Now the ThreadMXBean functions
  79 
  80         if (mbean.isThreadCpuTimeSupported() &&
  81             mbean.isThreadCpuTimeEnabled() ) {
  82             System.out.println("Calling getThreadCpuTime ...");
  83             long t1 = mbean.getThreadCpuTime(t.getId());
  84             if (t1 != -1) {
  85                 // At least on PPC, we know threads can still be around a short
  86                 // instant. In some stress scenarios we seem to grab times of
  87                 // new threads started with the same thread id. In these cases
  88                 // we get here.
  89                 System.out.println("Unexpected: thread still reports CPU time: " + t1);
  90             } else {
  91                 System.out.println("Okay: getThreadCpuTime() reported -1 as expected");
  92             }
  93         } else {
  94             System.out.println("Skipping Thread CPU time test as it's not supported");
  95         }
  96 
  97         System.out.println("Calling getThreadUserTime ...");
  98         long t1 = mbean.getThreadUserTime(t.getId());
  99         if (t1 != -1) {
 100             // At least on PPC, we know threads can still be around a short
 101             // instant. In some stress scenarios we seem to grab times of
 102             // new threads started with the same thread id. In these cases
 103             // we get here.
 104             System.out.println("Unexpected: thread still reports User time: " + t1);
 105         } else {
 106             System.out.println("Okay: getThreadUserTime() reported -1 as expected");
 107         }
 108 
 109         System.out.println("Calling getThreadInfo ...");
 110         ThreadInfo info = mbean.getThreadInfo(t.getId());
 111         System.out.println(info);
 112 
 113         System.out.println("Calling getThreadInfo with stack ...");
 114         info = mbean.getThreadInfo(t.getId(), Integer.MAX_VALUE);
 115         System.out.println(info);
 116     }
 117 }