pcntl_getpriority

(PHP 5)

pcntl_getpriority — Get the priority of any process

Popis

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.

Seznam parametrů

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

Návratové hodnoty

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

Varování

Tato funkce může vracet booleovskou hodnotu FALSE, ale také nebooleovskou hodnotu odpovídající ohodnocení FALSE, například 0 nebo "". Čtěte prosím sekci o typu Boolean, kde najdete více informací. Pro testování návratové hodnoty této funkce použijte operátor ===.

Viz také

pcntl_setpriority()

add a note User Contributed Notes
pcntl_getpriority

jonathan at jcdesigns dot com
15-May-2008 02:12


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: Sat, 24 Mar 2007