Class ThreadGroup

classpath/java/lang/ThreadGroup.java:15–117

import avian.Cell;

public class ThreadGroup implements Thread.UncaughtExceptionHandler {
  private final ThreadGroup parent;
  private final String name;
  private Cell<ThreadGroup> subgroups;

  public ThreadGroup(ThreadGroup parent, String name) {
    this.parent = parent;
    this.name = name;

    synchronized (parent) {
      parent.subgroups = new Cell(this, subgroups);
    }
  }

  public ThreadGroup(String name) {
    this(Thread.currentThread().getThreadGroup(), name);
  }

  public void uncaughtException(Thread t, Throwable e) {
    if (parent != null) {
      parent.uncaughtException(t, e);
    } else {
      Thread.UncaughtExceptionHandler deh
        = Thread.getDefaultUncaughtExceptionHandler();
      if (deh != null) {
        deh.uncaughtException(t, e);
      } else if (! (e instanceof ThreadDeath)) {
        e.printStackTrace();
      }
    }
  }

  public ThreadGroup getParent() {
    return parent;
  }

  public String getName() {
    return name;
  }

  public int activeCount() {
    int allCount = Thread.activeCount();
    Thread[] all = new Thread[allCount];
    allCount = Thread.enumerate(all);

    int count = 0;
    for (int i = 0; i < allCount; ++i) {
      if (parentOf(all[i].getThreadGroup())) {
        ++ count;
      }
    }

    return count;
  }

  public int enumerate(Thread[] threads) {
    return enumerate(threads, true);
  }