pcntl_setpriority

    (PHP 5, PHP 7, PHP 8)

    pcntl_setpriority — Cambia la prioridad de un proceso

    Descripción

    pcntl_setpriority(int $priority, ?int $process_id = null, int $mode = PRIO_PROCESS): bool

    pcntl_setpriority() cambia la prioridad de process_id a priority.

    Parámetros

    priority

    priority es generalmente un valor que va de -20 a 20. La prioridad por omisión es 0 mientras que un valor numérico más pequeño favorece una mejor planificación. Como los niveles de prioridad cambian entre los tipos de sistemas y las versiones de kernel, lea la página de manual getpriority(2) de su sistema para detalles específicos.

    process_id

    Si null, se utiliza el identificador del proceso actual.

    mode

    Una constante entre PRIO_PGRP, PRIO_USER, PRIO_PROCESS, PRIO_DARWIN_BG o PRIO_DARWIN_THREAD.

    Valores devueltos

    Devuelve true en caso de éxito o false en caso de error.

    Historial de cambios

    Versión Descripción
    8.0.0 process_id es ahora nullable.

    Ver también

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    User Contributed Notes 2 notes

    up
    2
    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).
    up
    -1
    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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