content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package art;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  
  public class Test925 {
    public static void run() throws Exception {
      doTest();
    }
  
    private static void doTest() throws Exception {
      Thread t1 = Thread.currentThread();
      ThreadGroup curGroup = t1.getThreadGroup();
  
      ThreadGroup rootGroup = curGroup;
      while (rootGroup.getParent() != null) {
        rootGroup = rootGroup.getParent();
      }
  
      ThreadGroup topGroups[] = getTopThreadGroups();
      if (topGroups == null || topGroups.length != 1 || topGroups[0] != rootGroup) {
        System.out.println(Arrays.toString(topGroups));
        throw new RuntimeException("Unexpected topGroups");
      }
  
      printThreadGroupInfo(curGroup);
      printThreadGroupInfo(rootGroup);
  
      waitGroupChildren(rootGroup, 5 /* # daemons */, 30 /* timeout in seconds */);
  
      checkChildren(curGroup);
    }
  
    private static void printThreadGroupInfo(ThreadGroup tg) {
      Object[] threadGroupInfo = getThreadGroupInfo(tg);
      if (threadGroupInfo == null || threadGroupInfo.length != 4) {
        System.out.println(Arrays.toString(threadGroupInfo));
        throw new RuntimeException("threadGroupInfo length wrong");
      }
  
      System.out.println(tg);
      System.out.println("  " + threadGroupInfo[0]);  // Parent
      System.out.println("  " + threadGroupInfo[1]);  // Name
      System.out.println("  " + threadGroupInfo[2]);  // Priority
      System.out.println("  " + threadGroupInfo[3]);  // Daemon
    }
  
    private static void checkChildren(ThreadGroup tg) {
      Object[] data = getThreadGroupChildren(tg);
      Thread[] threads = (Thread[])data[0];
      ThreadGroup[] groups = (ThreadGroup[])data[1];
  
      List<Thread> threadList = new ArrayList<>(Arrays.asList(threads));
  
      // Filter out JIT thread. It may or may not be there depending on configuration.
      Iterator<Thread> it = threadList.iterator();
      while (it.hasNext()) {
        Thread t = it.next();
        if (t.getName().startsWith("Jit thread pool worker")) {
          it.remove();
          break;
        }
      }
  
      Collections.sort(threadList, THREAD_COMP);
  
      Arrays.sort(groups, THREADGROUP_COMP);
      System.out.println(tg.getName() + ":");
      System.out.println("  " + threadList);
      System.out.println("  " + Arrays.toString(groups));
  
      if (tg.getParent() != null) {
        checkChildren(tg.getParent());
      }
    }
  
    private static void waitGroupChildren(ThreadGroup tg, int expectedChildCount, int timeoutS)
        throws Exception {
      for (int i = 0; i <  timeoutS; i++) {
        Object[] data = getThreadGroupChildren(tg);
        Thread[] threads = (Thread[])data[0];
        if (threads.length == expectedChildCount) {
          return;
        }
        Thread.sleep(1000);
      }
  
      Object[] data = getThreadGroupChildren(tg);
      Thread[] threads = (Thread[])data[0];
      System.out.println(Arrays.toString(threads));
      throw new RuntimeException("Waited unsuccessfully for " + expectedChildCount + " children.");
    }
  
    private final static Comparator<Thread> THREAD_COMP = new Comparator<Thread>() {
      public int compare(Thread o1, Thread o2) {
        return o1.getName().compareTo(o2.getName());
      }
    };
  
    private final static Comparator<ThreadGroup> THREADGROUP_COMP = new Comparator<ThreadGroup>() {
      public int compare(ThreadGroup o1, ThreadGroup o2) {
        return o1.getName().compareTo(o2.getName());
      }
    };
  
    private static native ThreadGroup[] getTopThreadGroups();
    private static native Object[] getThreadGroupInfo(ThreadGroup tg);
    // Returns an array where element 0 is an array of threads and element 1 is an array of groups.
    private static native Object[] getThreadGroupChildren(ThreadGroup tg);
  }
  