pcntl_getpriority

(PHP 5, PHP 7)

pcntl_getpriorityGet the priority of any process

설명

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.

인수

pid

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

process_identifier

One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.

반환값

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

Warning

이 함수는 논리 FALSE를 반환하지만, 논리 FALSE로 취급할 수 있는 다른 값을 반환할 수 있습니다. 자세한 정보는 논리형 섹션을 참고하십시오. 이 함수의 반환값을 확인하려면 === 연산자를 이용하십시오.

참고

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User Contributed Notes 1 note

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jonathan at jcdesigns dot com
13 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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