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<a href="00869.html" target="topic">第十三章 进程间的同步与通信</a>, <a href="00936.html" target="topic">主题</a></div>
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<a href="#" onmousedown="showPopup(this, 'popup00273');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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13.3 mailbox</div>
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<span style="color: #0000FF">maibox</span>是一种通信机制，它使得消息能够在进程间通信。被一个进程发送到一个<span style="color: #0000FF">mailbox</span>的数据可以被另外一个进程重新获得。 </p>
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从概念上讲，<span style="color: #0000FF">mailbox</span>的行为就像一个真实的邮箱一样。当一封信被分发并且放入到邮箱的时候，一个人可以重新获得这封信（以及存储在其中的任何数据）。然而，如果当这个人检查邮箱的时候这封信还没有被分发，那么这个人必须做出选择：它要么等待这封信被分发，要么在下一次检查邮箱的时候重新获得这封信。与此类似，SystemVerilog的<span style="color: #0000FF">mailbox</span>以一个可控的方式来传输和接收数据。在产生<span style="color: #0000FF">mailbox</span>的时候，它可以具有有界的队列尺寸也可以具有无边界的尺寸。当一个有界<span style="color: #0000FF">mailbox</span>包含了其边界数目的消息的时候，<span style="color: #0000FF">mailbox</span>会变满。一个试图向已经满了的<span style="color: #0000FF">mailbox</span>放置消息的进程应该被挂起，直到在<span style="color: #0000FF">mailbox</span>队列中具有足够的空间。在一个发送操作中，无边界<span style="color: #0000FF">mailbox</span>永远也不会挂起一个线程。 </p>
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产生一个<span style="color: #0000FF">mailbox</span>的例子如下： </p><div class="Element170">
<a href="#" onclick="CopyElementToClipboard('code00505');">Copy Code</a></div>
<div class="Element13"><div class="Element12" id="code00505"><pre class="Element12"><span style="color: #0000FF">mailbox</span> mbxRcv<span style="color: #800080">;</span></pre></div></div>
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<span style="color: #0000FF">mailbox</span>是一个内建的类，它提供了下列方法：</p>
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<li class="Element600">产生一个<span style="color: #0000FF">mailbox</span>：<span style="color: #0000FF">new</span><span style="color: #800080">()</span></li>
<li class="Element600">将一个消息放置到一个<span style="color: #0000FF">mailbox</span>中：<span style="color: #0000FF">put</span><span style="color: #800080">()</span></li>
<li class="Element600">尝试将一个消息无阻塞地放置到一个<span style="color: #0000FF">mailbox</span>中：<span style="color: #0000FF">try_put</span><span style="color: #800080">()</span></li>
<li class="Element600">从一个<span style="color: #0000FF">mailbox</span>中重新获得一个消息：<span style="color: #0000FF">get</span><span style="color: #800080">()</span>或者<span style="color: #0000FF">peek</span><span style="color: #800080">()</span></li>
<li class="Element600">尝试无阻塞地从一个<span style="color: #0000FF">mailbox</span>中重新获得一个消息：<span style="color: #0000FF">try_get</span><span style="color: #800080">()</span>或<span style="color: #0000FF">try_peek</span><span style="color: #800080">()</span></li>
<li class="Element600">重新获得<span style="color: #0000FF">mailbox</span>中消息的数目：<span style="color: #0000FF">num</span><span style="color: #800080">()</span></li>
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<a href="00869.html" target="topic">第十三章 进程间的同步与通信</a></p></div>
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主题 </div></td><td class="Element204" valign="top" width="50%">
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描述 </div></td></tr><tr>
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<a href="00095.html" target="topic">13.3.1 new()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">new</span><span style="color: #800080">()</span>方法用来产生<span style="color: #0000FF">mailbox</span>。<br><br><span style="color: #0000FF">mailbox new</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00096.html" target="topic">13.3.2 num()</a> </div></td><td class="Element206" valign="top" width="50%">
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一个<span style="color: #0000FF">mailbox</span>中消息的数目可以通过<span style="color: #0000FF">num</span><span style="color: #800080">()</span>方法获得。<br><br><span style="color: #0000FF">num</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00097.html" target="topic">13.3.3 put()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">put</span><span style="color: #800080">()</span>方法将一个消息放入到一个<span style="color: #0000FF">mailbox</span>中。<br><br><span style="color: #0000FF">put</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00098.html" target="topic">13.3.4 try_put()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">try_put</span><span style="color: #800080">()</span>方法尝试将一个消息放置在一个<span style="color: #0000FF">mailbox</span>中。<br><br><span style="color: #0000FF">try_put</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00099.html" target="topic">13.3.5 get()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">get</span><span style="color: #800080">()</span>方法从一个mailbox中重新获得一个消息。<br><br><span style="color: #0000FF">get</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00100.html" target="topic">13.3.6 try_get()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">try_get</span><span style="color: #800080">()</span>方法尝试无阻塞地从一个mailbox中重新获得一个消息。<br><br><span style="color: #0000FF">try_get</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00101.html" target="topic">13.3.7 peek()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">peek</span><span style="color: #800080">()</span>方法从一个mailbox中拷贝一个消息但不会将其从队列中删除。<br><br><span style="color: #0000FF">peek</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr><tr>
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<a href="00102.html" target="topic">13.3.8 try_peek()</a> </div></td><td class="Element206" valign="top" width="50%">
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<span style="color: #0000FF">try_peek</span><span style="color: #800080">()</span>方法尝试从一个mailbox中无阻塞地拷贝一个消息。<br><br><span style="color: #0000FF">try_peek</span><span style="color: #800080">()</span>方法的原型如下： </div></td></tr></table></div></div>
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<a href="00869.html" target="topic">第十三章 进程间的同步与通信</a>, <a href="00936.html" target="topic">主题</a></div>
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