ss). This is currently only supported by the dartvm.  For now, the
dart2js compiler only supports the restricted messages described above.</p>
<p>The send happens immediately and doesn't block.  The corresponding receive
port can receive the message as soon as its isolate's event loop is ready
to deliver it, independently of what the sending isolate is doing.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-da