pcntl_getpriority

(PHP 5)

pcntl_getpriority — Get the priority of any process

Descripción

int pcntl_getpriority ([ int $pid = getmypid() [, int $process_identifier = PRIO_PROCESS ]] )

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

Parámetros

pid: If not specified, the pid of the current process is used.
process_identifier: 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.

Ver también

pcntl_setpriority() - Change the priority of any process

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jonathan at jcdesigns dot com ¶

5 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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