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135 lines
11 KiB
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<!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>Creates a request group</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-grp" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">eio_grp</h1>
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<p class="verinfo">(PECL eio >= 0.0.1dev)</p><p class="refpurpose"><span class="refname">eio_grp</span> — <span class="dc-title">Creates a request group</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.eio-grp-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_grp</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code><span class="initializer"> = NULL</span></span>
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] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>eio_grp()</strong></span> creates a request group.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.eio-grp-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">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-grp-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>eio_grp()</strong></span> returns request group resource on success or <strong><code>FALSE</code></strong> on error.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.eio-grp-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-4275">
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<p><strong>Example #1 <span class="function"><strong>eio_grp()</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 />$temp_filename </span><span style="color: #007700">= </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">) .</span><span style="color: #DD0000">"/eio-file.tmp"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"some data"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$my_file_fd </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Is called when the group requests are done */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_done</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Remove the file, if it still exists<br /> </span><span style="color: #007700">@</span><span style="color: #0000BB">unlink</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Is called when the temporary file is opened */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_file_opened_callback</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 /> global </span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">$grp</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">$my_file_fd </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_grp_file_read_callback"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Is called when the file is read */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_file_read_callback</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 /> global </span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">$grp</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">// Create request to close the file<br /> </span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">// Add request to the group<br /> </span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Create request group<br /></span><span style="color: #0000BB">$grp </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_grp</span><span style="color: #007700">(</span><span style="color: #DD0000">"my_grp_done"</span><span style="color: #007700">, </span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Create request<br /></span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_open</span><span style="color: #007700">(</span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">, </span><span style="color: #0000BB">EIO_O_RDWR </span><span style="color: #007700">| </span><span style="color: #0000BB">EIO_O_APPEND </span><span style="color: #007700">, </span><span style="color: #0000BB">NULL</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_grp_file_opened_callback"</span><span style="color: #007700">, </span><span style="color: #0000BB">NULL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Add request to the group<br /></span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</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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string(4) "some"
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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-grp-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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<li class="member">eio_grp_add</li>
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</ul>
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</div>
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</div></div></div></body></html> |