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161 lines
6.4 KiB
HTML
161 lines
6.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Cancels a request</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.eio-cancel" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">eio_cancel</h1>
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<p class="verinfo">(PECL eio >= 0.0.1dev)</p><p class="refpurpose"><span class="refname">eio_cancel</span> — <span class="dc-title">Cancels a request</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.eio-cancel-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>eio_cancel</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$req</code></span>
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) : <span class="type"><span class="type void">void</span></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>eio_cancel()</strong></span> cancels a request specified by
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<code class="parameter">req</code>
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.eio-cancel-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">req</code></dt>
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<dd>
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<p class="para">
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The request resource
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</p>
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</dd>
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<dt>
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<code class="parameter">pri</code></dt>
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<dd>
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<p class="para">请求的优先级：<strong><code>EIO_PRI_DEFAULT</code></strong>，<strong><code>EIO_PRI_MIN</code></strong>，<strong><code>EIO_PRI_MAX</code></strong> 或 <strong><code>NULL</code></strong>。如果是
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<strong><code>NULL</code></strong>，<code class="parameter">pri</code> 将设为
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<strong><code>EIO_PRI_DEFAULT</code></strong>。
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</p>
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</dd>
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<dt>
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<code class="parameter">callback</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">callback</code>
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函数在请求完成时被调用。其应匹配一下原型：<div class="example-contents"><div class="phpcode"><pre><span style="color: #000000">
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void callback(mixed $data, int $result[, resource $req]);</span>
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</pre></div></div>
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<dl>
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<dt>
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<code class="parameter">data</code></dt>
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<dd>
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<p class="para">传递给请求的用户数据。</p></dd>
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<dt>
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<code class="parameter">result</code></dt>
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<dd>
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<p class="para">针对请求的结果的值。通常是相应的系统调用返回的值。</p></dd>
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<dt>
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<code class="parameter">req</code></dt>
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<dd>
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<p class="para">可选的请求资源，可被 <span class="function"><a href="eio_get_last_error.html" class="function">eio_get_last_error()</a></span>
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之类的函数使用。</p></dd>
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</dl>
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</p>
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</dd>
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<dt>
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<code class="parameter">data</code></dt>
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<dd>
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<p class="para">
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Arbitrary variable passed to <code class="parameter">callback</code>.
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.eio-cancel-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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没有返回值。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.eio-cancel-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-4269">
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<p><strong>Example #1 <span class="function"><strong>eio_cancel()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /> </span><span style="color: #FF8000">/* Is called when eio_nop() finished */<br /> </span><span style="color: #007700">function </span><span style="color: #0000BB">my_nop_cb</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"my_nop "</span><span style="color: #007700">, </span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> }<br /><br /></span><span style="color: #FF8000">// This eio_nop() call will be cancelled<br /></span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_nop</span><span style="color: #007700">(</span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_nop_cb"</span><span style="color: #007700">, </span><span style="color: #DD0000">"1"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">eio_cancel</span><span style="color: #007700">(</span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// This time eio_nop() will be processed<br /></span><span style="color: #0000BB">eio_nop</span><span style="color: #007700">(</span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_nop_cb"</span><span style="color: #007700">, </span><span style="color: #DD0000">"2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Process requests<br /></span><span style="color: #0000BB">eio_event_loop</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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resource(4) of type (EIO Request Descriptor)
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my_nop 2
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</pre></div>
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</div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.eio-cancel-seealso">
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<h3 class="title">参见</h3>
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<ul class="simplelist">
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<li class="member">eio_grp_cancel</li>
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</ul>
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</div>
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</div></div></div></body></html> |