Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    fn = function() {
      deferred.resolve();
    };
    var channel = new MessageChannel();
    // linked list of tasks (single, with head node)
    var head = {},
        tail = head;
    channel.port1.onmessage = function() {
      head = head.next;
      var task = head.task;
      delete head.task;
      task();
    };
    nextTick_messageChannel = function(task) {
      tail = tail.next = {
        task: task
      };
      channel.port2.postMessage(0);
    };
    
    nextTick_setTimeout = function(task) {
      setTimeout(task, 0);
    }
  };
</script>

Test runner

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// async test
nextTick_setTimeout(fn);

// async test
nextTick_messageChannel(fn);

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