pcntl_getpriority

(PHP 5, PHP 7)

pcntl_getpriorityGet the priority of any process

Opis

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

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.

Parametry

pid

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

process_identifier

One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.

Zwracane wartości

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

Ostrzeżenie

Ta funkcja może zwrócić Boolean FALSE, ale może też zwrócić wartość innego typu niż Boolean, która oznacza wartość FALSE. Aby uzyskać więcej informacji proszę zapoznać się z rozdziałem Typy logiczne. Można używać operatora === do testowania zwracanych wartości przez tę funkcję.

Zobacz też:

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User Contributed Notes 1 note

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jonathan at jcdesigns dot com
12 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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