this.workers.set(worker.id, worker);
  send(this.errno, null, this.handle);
};

SharedHandle.prototype.remove = function(worker) {
  if (!this.workers.has(worker.id))
    return false;

  this.workers.delete(worker.id);

  if (this.workers.size !== 0)
    return false;

  this.handle.close();
  this.handle = null;
  return true;
};