PHP Unconference Europe 2015

time_nanosleep

(PHP 5)

time_nanosleepAttendre pendant un nombre de secondes et de nanosecondes

Description

mixed time_nanosleep ( int $seconds , int $nanoseconds )

time_nanosleep() impose un délai d'exécution de seconds secondes et nanoseconds nanosecondes.

Liste de paramètres

seconds

Doit être un entier non-négatif.

nanoseconds

Doit être un entier non-négatif, inférieur à 1 milliard.

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Si le délai est interrompu par un signal, un tableau associatif sera retourné avec les éléments :

  • seconds : nombre de secondes restantes dans le délai
  • nanoseconds : nombre de nanosecondes restantes dans le délai

Historique

Version Description
5.3.0 Cette fonction est maintenant disponible sous Windows.

Exemples

Exemple #1 Exemple avec time_nanosleep()

<?php
// Attention ! Cela ne fonctionnera pas comme prévu si un tableau est retourné
if (time_nanosleep(0500000000)) {
    echo 
"Dors pendant une demie seconde.\n";
}

// Ceci est meilleur :
if (time_nanosleep(0500000000) === true) {
    echo 
"Dors pendant une demie seconde.\n";
}

// Et ceci est la meilleur façon :
$nano time_nanosleep(2100000);

if (
$nano === true) {
    echo 
"Dors pendant 2 secondes et 100 microsecondes.\n";
} elseif (
$nano === false) {
    echo 
"Le délai a échoué.\n";
} elseif (
is_array($nano)) {
    
$seconds $nano['seconds'];
    
$nanoseconds $nano['nanoseconds'];
    echo 
"Interrompu par un signal.\n";
    echo 
"Temps restant : $seconds secondes, $nanoseconds nanosecondes.";
}
?>

Voir aussi

  • sleep() - Arrête l'exécution durant quelques secondes
  • usleep() - Arrête l'exécution durant quelques microsecondes
  • time_sleep_until() - Arrête le script pendant une durée spécifiée
  • set_time_limit() - Fixe le temps maximum d'exécution d'un script

add a note add a note

User Contributed Notes 5 notes

up
5
fantasysportswire at yahoo dot com
7 years ago
Just glancing at this - and the note from over a year ago with a implementation for windows.. with 5.0.0 and higher it would be simplier to just do something like......

<?php

if (!function_exists('time_nanosleep')) {

function
time_nanosleep($seconds, $nanoseconds) {

sleep($seconds);
usleep(round($nanoseconds/100));

return
true;

}

}

?>

....off the top of my head - obviously simple enough there should be no mistakes.. but those are the ones that always seem to get ya :( .....
up
2
b dot andrew at shaw dot ca
6 years ago
A response to the note below:

Your function is also useless, as the WinNT 32 kernel only functions at a minimum of about 10+ ms (1,000 us), rendering usleep() useless, because usleep uses the C function which is provided by the system (in this case, kernel32.dll).

You'll want to use a function that does not rely on the kernel, but rather something made for precise measurement:

<?php
function usleep_win( $micro_seconds )
{
    if ( @
function_exists( "socket_create" ) && @function_exists( "socket_select" ) )
    {
       
$false = NULL;
       
$socket = array( socket_create( AF_INET, SOCK_RAW, $false ) );
       
socket_select( $false, $false, $socket, 0, $micro_seconds );
        return
true;
    }
    else
    {
        return
false;
    }
}
?>

This function will allow to you sleep for a specified microsecond, although I have measured it to be off by ~5 us.

Again, most of this depends on the hardware in your system. If you _REALLY_ need to be precise to < 10 us, you shouldn't be using WinNT anyways!
up
2
anybody (a) emuxperts.net
8 years ago
Documentation states that "seconds" must be positive. This is not correct, 0 is possible.

Rather, "seconds" must be non-negative.
up
2
m at kufi dot net
9 years ago
You should take into account, if you use the function replacement down here, the CPU will be in use of 99% for the time of execution...

(A little bit better in this situation is to let the 'full seconds' go by a normal sleep command (makes the thread sleep!, and uses minimum cpu))

<?php
   
//THIS IS THE FUNCTION WE ARE TALKIN ABOUT
   
function timeWait($microtime)
    {
//optimizations added by me [start]
//sleep the full seconds
sleep(intval($microtime));
//set the microtime to only resleep the last part of the nanos
$microtime = $microtime - intval($microtime);
//optimizations added by me [end]

       
$timeLimit = $microtime + array_sum(explode(" ",microtime()));
        while(
array_sum(explode(" ",microtime())) < $timeLimit)
        {
/*DO NOTHING*/}
        return(
true);
    }

   
//THIS IS HOW WE CAN USE IT
   
echo "Process started at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.<br>";
   
timeWait(5.5); //With this call the system will wait 5 seconds and a half. You can use either integer or float.
   
echo "Process completed at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.";
?>
up
0
tecnomaniac at ig dot com dot br
9 years ago
This is an alternative function to sleep_nanosecond that you can use with PHP versions below PHP 5.0. It is not very accurate if we talk about nanoseconds but the results are satisfatory. Enjoy!

<?php
   
//THIS IS THE FUNCTION WE ARE TALKIN ABOUT
   
function timeWait($microtime)
    {
       
$timeLimit = $microtime + array_sum(explode(" ",microtime()));
        while(
array_sum(explode(" ",microtime())) < $timeLimit)
        {
/*DO NOTHING*/}
        return(
true);
    }

   
//THIS IS HOW WE CAN USE IT
   
echo "Process started at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.<br>";
   
timeWait(5.5); //With this call the system will wait 5 seconds and a half. You can use either integer or float.
   
echo "Process completed at " . date("H:i:s") . " and " . current(explode(" ",microtime())) . " nanoseconds.";
?>
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