!747

m {

  static Map<Long, Thread> idToThread;

  p {

    ThreadMXBean mx = ManagementFactory.getThreadMXBean();

    // just for fun

    print("Total started thread count: " + mx.getTotalStartedThreadCount());

    boolean cpuTimeSupported = mx.isThreadCpuTimeSupported();

    print("CPU time supported: " + cpuTimeSupported);

    if (!cpuTimeSupported) fail("No CPU time info available on platform.");

    long[] threads = mx.getAllThreadIds();

    long time = now();

    L<Thread> l = getAllThreads();

    print((now()-time) + " ms for getAllThreads()");

    print(l.size() + " threads");

    idToThread = new TreeMap();

    for (Thread t : l)

      idToThread.put(t.getId(), t);

    for (long id : threads) {

      long nano = mx.getThreadCpuTime(id);

      long ms = nano/1000000;

      Thread t = idToThread.get(id);

      if (t == null)

        print("? thread not found: " + id);

      else

        print("Thread " + quote(t.getName()) + ": CPU time = " + ms + " ms");

    }

  }

  static L<Thread> getAllThreads() {

    ThreadGroup rootGroup = Thread.currentThread().getThreadGroup();

    ThreadGroup parentGroup;

    while ( ( parentGroup = rootGroup.getParent() ) != null )

      rootGroup = parentGroup;

    Thread[] threads = new Thread[rootGroup.activeCount()];

    int n;

    while ((n = rootGroup.enumerate(threads, true)) == threads.length)       threads = new Thread[threads.length*2];

    L<Thread> l = new ArrayList<Thread>(n);

    for (int i = 0; i < n; i++) l.add(threads[i]);

    ret l;

  }

}