pcntl_getpriority
As for the renice function by leandro dot pereira at gmail dot com, this isn't true. pcntl_setpriority() doesn't set the nice level of a process, but instead sets the base priority of it. At first glance this might seem like the same thing, but on a system level, they are actually quite different.
In fact, if you're looking to use pcntl_setpriority() to prioritize your process (a tool or a daemon or what-not), I wouldn't recomend using setpriority at all, but renice it instead. Let the system manage priorities and you'll end up with the results you were looking for.
This applies only to POSIX based systems only (as does the function presented by leandro dot pereira at gmail dot com as well).
pcntl_setpriority
(PHP 5)
pcntl_setpriority — Change the priority of any process
Descrierea
bool pcntl_setpriority
( int $priority
[, int $pid
[, int $process_identifier
]] )
pcntl_setpriority() sets the priority of pid .
Parametri
- priority
-
priority is generally a value in the range -20 to 20. The default priority is 0 while a lower numerical value causes more favorable scheduling. Because priority levels can differ between system types and kernel versions, please see your system's setpriority(2) man page for specific details.
- pid
-
If not specified, the pid of the current process is used.
- process_identifier
-
One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.
Valorile întroarse
Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eşecului.
add a note
User Contributed Notespcntl_setpriority
t dot stobbe at blackdogdev dot com
28-Aug-2006 12:49
28-Aug-2006 12:49
leandro dot pereira at gmail dot com
23-Dec-2004 04:08
23-Dec-2004 04:08
The following snippet may be used under older versions of PHP to provide similar functionality. Tested only under Linux.
<?php
function _pcntl_setpriority($priority, $pid = 0)
{
$priority = (int)$priority;
$pid = (int)$pid;
if ($priority > 20 && $priority < -20) {
return False;
}
if ($pid == 0) {
$pid = getmypid();
}
return system("renice $priority -p $pid") != false;
}
?>