pcntl_getpriority

(PHP 5)

pcntl_getpriority — Get the priority of any process

Descrierea

int pcntl_getpriority ([ int $pid [, int $process_identifier ]] )

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.

Parametri

pid: If not specified, the pid of the current process is used.
process_identifier: One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.

Valorile întroarse

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

Avertizare

Această funcţie poate întoarce valoarea Boolean FALSE, dar poate de asemenea întoarce o valoare non-Boolean care evaluează în FALSE, cum ar fi 0 sau "". Vă rugăm să citiţi secţiunea despre tipul Boolean pentru mai multe informaţii. Utilizaţi operatorul === pentru a verifica valoarea întoarsă de această funcţie.

Vedeţi de asemenea

pcntl_setpriority()

add a note User Contributed Notes
pcntl_getpriority

jonathan at jcdesigns dot com
15-May-2008 11:12


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);

}

add a note

pcntl_setpriority

pcntl_fork

Last updated: Fri, 01 Aug 2008