pcntl_getpriority

(PHP 5)

pcntl_getpriority — Get the priority of any process

Descrizione

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.

Elenco dei parametri

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

Valori restituiti

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

Avviso

Questa funzione può restituire il Booleano FALSE, ma può anche restituire un valore non-Booleano valutato come FALSE. Fare riferimento alla sezione Booleans per maggiori informazioni. Usare l'operatore === per controllare il valore restituito da questa funzione.

Vedere anche:

pcntl_setpriority() - Change the priority of any process

add a note User Contributed Notes pcntl_getpriority - [1 notes]

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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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