pcntl_setpriority() - pcntl进程控制

百变鹏仔2年前 (2023-11-21)阅读数 19#技术干货

文章标签优先级

pcntl_setpriority()

(PHP 5, PHP 7)

修改任意进程的优先级

说明

pcntl_setpriority(int $priority[,int $pid= getmypid()[,int $process_identifier= PRIO_PROCESS]]): bool

pcntl_setpriority()设置进程号为$pid的进程的优先级。

参数

$priority

$priority通常时-20至20这个范围内的值。默认优先级是0,值越小代表优先级越高。由于不同的系统类型以及内核版本下优先级可能不同，因此请参考您系统的setpriority（2）手册以获取详细的规范。

pcntl_setpriority() - pcntl进程控制

$pid

如果没有指定，默认是当前进程的进程号。

$process_identifier

PRIO_PGRP（译注：获取进程组优先级）,PRIO_USER（译注：获取用户进程优先级）或PRIO_PROCESS（译注：默认值;获取进程优先级）三者之一。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

参见

pcntl_getpriority()获取任意进程的优先级

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).

The following snippet may be used under older versions of PHP to provide similar functionality. Tested only under Linux.

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