// a variant of thread where you can get the Runnable target later.
// Also notes its existence on the VM bus.
// We should use this exclusively instead of Thread.

sclass BetterThread extends Thread {
  Runnable target;
  
  *(Runnable *target) { _created(); }
  *(Runnable *target, S name) { super(name); _created(); }
  
  void _created() { vmBus_send threadCreated(this); }
  
  run {
    try {
      vmBus_send threadStarted(this);
      if (target != null) target.run();
    } finally {
      vmBus_send threadEnded(this); 
    }
  }
  
  Runnable getTarget() { ret target; }
}