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192 lines
6.2 KiB
HTML
192 lines
6.2 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>修改当前进程的优先级</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.proc-nice" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">proc_nice</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">proc_nice</span> — <span class="dc-title">修改当前进程的优先级</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.proc-nice-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>proc_nice</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$increment</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>proc_nice()</strong></span> 修改当前进程的优先级,
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修改量由 <code class="parameter">increment</code> 参数指定。
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<code class="parameter">increment</code> 为正数会降低当前进程优先级,
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反之,为负数会提高优先级。
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</p>
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<p class="para">
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<span class="function"><strong>proc_nice()</strong></span> 和
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<span class="function"><a href="proc_open.html" class="function">proc_open()</a></span> 函数以及和 <span class="function"><a href="proc_open.html" class="function">proc_open()</a></span> 相关的函数并无什么关系。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.proc-nice-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">increment</code></dt>
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<dd>
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<p class="para">
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新的优先级值,具体的设定取决于所运行的平台。
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</p>
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<p class="para">
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在 Unix 系统上,较小的值表示较高的优先级,例如:<em>-20</em>,
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而正数值表示更低的优先级。
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</p>
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<p class="para">
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在 Windows 平台上,<code class="parameter">increment</code> 参数
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的含义如下:
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</p>
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>优先级</th>
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<th>可能的值</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td style="vertical-align: top;">高优先级</td>
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<td style="vertical-align: top;">
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<code class="parameter">increment</code> <em>< -9</em>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">较高优先级</td>
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<td style="vertical-align: top;">
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<code class="parameter">increment</code> <em>< -4</em>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">正常优先级</td>
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<td style="vertical-align: top;">
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<code class="parameter">increment</code> <em>< 5</em> &
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<code class="parameter">increment</code> <em>> -5</em>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">较低优先级</td>
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<td style="vertical-align: top;">
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<code class="parameter">increment</code> <em>> 5</em>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">低优先级</td>
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<td style="vertical-align: top;">
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<code class="parameter">increment</code> <em>> 9</em>
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</td>
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</tr>
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</tbody>
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</table>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.proc-nice-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>, 或者在失败时返回 <strong><code>FALSE</code></strong>。。
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如果发生错误,例如用户无权修改当前进程的优先级,
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会生成 <strong><code>E_WARNING</code></strong> 级别的错误。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.proc-nice-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4360">
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<p><strong>Example #1 使用 <span class="function"><a href="proc_open.html" class="function">proc_open()</a></span> 函数将进程设置为高优先级</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">// Highest priority<br /></span><span style="color: #0000BB">proc_nice</span><span style="color: #007700">(-</span><span style="color: #0000BB">20</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>
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.proc-nice-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>7.2.0</td>
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<td>
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在 Windows 平台上可用。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.proc-nice-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<strong>可用性</strong><br />
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<p class="para">
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仅在具有 'nice' 能力的系统上才可以使用 <span class="function"><strong>proc_nice()</strong></span> 函数。
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下列系统含有 'nice':SVr4, SVID EXT, AT&T, X/OPEN, BSD 4.3。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<strong>Windows 平台</strong><br />
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<p class="para">
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<span class="function"><strong>proc_nice()</strong></span> 函数会改变 <em class="emphasis">当前</em>
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进程优先级,即使 PHP 是使用线程安全模式编译的。
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</p>
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</p></blockquote>
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</div>
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</div></div></div></body></html> |