pcntl_getpriority

(PHP 5, PHP 7, PHP 8)

pcntl_getpriorityGet the priority of any process

Descripción

pcntl_getpriority(?int $process_id = null, int $mode = PRIO_PROCESS): int|false

pcntl_getpriority() gets the priority of process_id. Because priority levels can differ between system types and kernel versions, please see your system's getpriority(2) man page for specific details.

Parámetros

process_id

If null, the process id of the current process is used.

mode

One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.

Valores devueltos

pcntl_getpriority() returns the priority of the process or false on error. A lower numerical value causes more favorable scheduling.

Advertencia

Esta función puede devolver el valor booleano false, pero también puede devolver un valor no booleano que se evalúa como false. Por favor lea la sección sobre Booleanos para más información. Use el operador === para comprobar el valor devuelto por esta función.

Historial de cambios

Versión Descripción
8.0.0 process_id is nullable now.

Ver también

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User Contributed Notes 1 note

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jonathan at jcdesigns dot com
14 years ago
This function is ideal for checking if a given process is running, I have seen solutions that involve running the system utilites like PS and parsing the answer, which should work fine, but this allows you to check a given PID with a single call

function CheckPID( $PID )
{
        // Check if the passed in PID represents a vlaid process in the system
        // Returns true if it does
        // Turn off non-fatal runtime warning for a moment as we know we
        // will get one if the PID does not represent a valid process

    $oldErrorLevel = error_reporting(0);
    error_reporting( $oldErrorLevel & ~E_WARNING );
    $res = pcntl_getpriority($PID);
    error_reporting( $oldErrorLevel);
    return ! ( $res === false);
}
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