pcntl_setpriority
(PHP 5, PHP 7, PHP 8)
pcntl_setpriority — プロセスの優先度を変更する
説明
pcntl_setpriority() は、
process_id の優先度を設定します。
パラメータ
priority-
priorityは一般的には-20から20までの値です。 デフォルトの優先度は0で、数字が小さいほど 優先順位が上となります。システムの型やカーネルの バージョンによって優先度の扱いは違うので、詳細についてはシステムの setpriority(2) の man ページを参照ください。 process_id-
nullだった場合は、現在のプロセスの プロセスID を使用します。 mode-
PRIO_PGRP、PRIO_USER、PRIO_PROCESS、PRIO_DARWIN_BG、PRIO_DARWIN_THREADのいずれか。
変更履歴
| バージョン | 説明 |
|---|---|
| 8.0.0 |
process_id は、nullable になりました。
|
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User Contributed Notes 2 notes
t dot stobbe at blackdogdev dot com ¶
18 years ago
As for the renice function by leandro dot pereira at gmail dot com, this isn't true. pcntl_setpriority() doesn't set the nice level of a process, but instead sets the base priority of it. At first glance this might seem like the same thing, but on a system level, they are actually quite different.
In fact, if you're looking to use pcntl_setpriority() to prioritize your process (a tool or a daemon or what-not), I wouldn't recomend using setpriority at all, but renice it instead. Let the system manage priorities and you'll end up with the results you were looking for.
This applies only to POSIX based systems only (as does the function presented by leandro dot pereira at gmail dot com as well).
leandro dot pereira at gmail dot com ¶
20 years ago
The following snippet may be used under older versions of PHP to provide similar functionality. Tested only under Linux.
<?php
function _pcntl_setpriority($priority, $pid = 0)
{
$priority = (int)$priority;
$pid = (int)$pid;
if ($priority > 20 && $priority < -20) {
return False;
}
if ($pid == 0) {
$pid = getmypid();
}
return system("renice $priority -p $pid") != false;
}
?>
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