1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package art;
18
19import java.util.ArrayList;
20import java.util.Arrays;
21import java.util.Comparator;
22import java.util.Collections;
23import java.util.Iterator;
24import java.util.List;
25
26public class Test925 {
27  public static void run() throws Exception {
28    doTest();
29  }
30
31  private static void doTest() throws Exception {
32    Thread t1 = Thread.currentThread();
33    ThreadGroup curGroup = t1.getThreadGroup();
34
35    ThreadGroup rootGroup = curGroup;
36    while (rootGroup.getParent() != null) {
37      rootGroup = rootGroup.getParent();
38    }
39
40    ThreadGroup topGroups[] = getTopThreadGroups();
41    if (topGroups == null || topGroups.length != 1 || topGroups[0] != rootGroup) {
42      System.out.println(Arrays.toString(topGroups));
43      throw new RuntimeException("Unexpected topGroups");
44    }
45
46    printThreadGroupInfo(curGroup);
47    printThreadGroupInfo(rootGroup);
48
49    waitGroupChildren(rootGroup, 5 /* # daemons */, 30 /* timeout in seconds */);
50
51    checkChildren(curGroup);
52  }
53
54  private static void printThreadGroupInfo(ThreadGroup tg) {
55    Object[] threadGroupInfo = getThreadGroupInfo(tg);
56    if (threadGroupInfo == null || threadGroupInfo.length != 4) {
57      System.out.println(Arrays.toString(threadGroupInfo));
58      throw new RuntimeException("threadGroupInfo length wrong");
59    }
60
61    System.out.println(tg);
62    System.out.println("  " + threadGroupInfo[0]);  // Parent
63    System.out.println("  " + threadGroupInfo[1]);  // Name
64    System.out.println("  " + threadGroupInfo[2]);  // Priority
65    System.out.println("  " + threadGroupInfo[3]);  // Daemon
66  }
67
68  private static void checkChildren(ThreadGroup tg) {
69    Object[] data = getThreadGroupChildren(tg);
70    Thread[] threads = (Thread[])data[0];
71    ThreadGroup[] groups = (ThreadGroup[])data[1];
72
73    List<Thread> threadList = new ArrayList<>(Arrays.asList(threads));
74
75    // Filter out JIT thread. It may or may not be there depending on configuration.
76    Iterator<Thread> it = threadList.iterator();
77    while (it.hasNext()) {
78      Thread t = it.next();
79      if (t.getName().startsWith("Jit thread pool worker")) {
80        it.remove();
81        break;
82      }
83    }
84
85    Collections.sort(threadList, THREAD_COMP);
86
87    Arrays.sort(groups, THREADGROUP_COMP);
88    System.out.println(tg.getName() + ":");
89    System.out.println("  " + threadList);
90    System.out.println("  " + Arrays.toString(groups));
91
92    if (tg.getParent() != null) {
93      checkChildren(tg.getParent());
94    }
95  }
96
97  private static void waitGroupChildren(ThreadGroup tg, int expectedChildCount, int timeoutS)
98      throws Exception {
99    for (int i = 0; i <  timeoutS; i++) {
100      Object[] data = getThreadGroupChildren(tg);
101      Thread[] threads = (Thread[])data[0];
102      if (threads.length == expectedChildCount) {
103        return;
104      }
105      Thread.sleep(1000);
106    }
107
108    Object[] data = getThreadGroupChildren(tg);
109    Thread[] threads = (Thread[])data[0];
110    System.out.println(Arrays.toString(threads));
111    throw new RuntimeException("Waited unsuccessfully for " + expectedChildCount + " children.");
112  }
113
114  private final static Comparator<Thread> THREAD_COMP = new Comparator<Thread>() {
115    public int compare(Thread o1, Thread o2) {
116      return o1.getName().compareTo(o2.getName());
117    }
118  };
119
120  private final static Comparator<ThreadGroup> THREADGROUP_COMP = new Comparator<ThreadGroup>() {
121    public int compare(ThreadGroup o1, ThreadGroup o2) {
122      return o1.getName().compareTo(o2.getName());
123    }
124  };
125
126  private static native ThreadGroup[] getTopThreadGroups();
127  private static native Object[] getThreadGroupInfo(ThreadGroup tg);
128  // Returns an array where element 0 is an array of threads and element 1 is an array of groups.
129  private static native Object[] getThreadGroupChildren(ThreadGroup tg);
130}
131