1: worker } = workerEntry;
    this.free.delete(workerId);
    this.handoff(worker);
  }
};

RoundRobinHandle.prototype.handoff = function(worker) {
  if (!this.all.has(worker.id)) {
    return;  // Worker is closing (or has closed) the server.
  }

  const handle = peek(this.handles);

  if (handle === null) {
    this.free.set(worker.id, worker);  // Add to ready queue again.
    return;
  }

  remove(handle);

  const message = { act: 'newconn', key: this.key };

  sendHelper(worker.process, message, handle, (reply) => {
    if (reply.accepted)
      handle.close();
    else
      this.distribute(0, handle);  // Worker is shutting down. Send to another.

    this.handoff(worker);
  });
};