php-doc-en/reference/pcntl/functions/pcntl-setpriority.xml
2021-08-18 12:12:36 +03:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.pcntl-setpriority" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pcntl_setpriority</refname>
<refpurpose>Change the priority of any process</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>pcntl_setpriority</methodname>
<methodparam><type>int</type><parameter>priority</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>process_id</parameter><initializer>&null;</initializer></methodparam>
<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>PRIO_PROCESS</constant></initializer></methodparam>
</methodsynopsis>
<para>
<function>pcntl_setpriority</function> sets the priority of
<parameter>process_id</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>priority</parameter></term>
<listitem>
<para>
<parameter>priority</parameter> is generally a value in the range
<literal>-20</literal> to <literal>20</literal>. The default priority
is <literal>0</literal> while a lower numerical value causes more
favorable scheduling. Because priority levels can differ between
system types and kernel versions, please see your system's setpriority(2)
man page for specific details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>process_id</parameter></term>
<listitem>
<para>
If &null;, the process id of the current process is used.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
<para>
One of <constant>PRIO_PGRP</constant>, <constant>PRIO_USER</constant>
or <constant>PRIO_PROCESS</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>process_id</parameter> is nullable now.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pcntl_getpriority</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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