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time_nanosleep

(PHP 5, PHP 7, PHP 8)

time_nanosleepAtrasa por um número de segundos e nanossegundos

Descrição

time_nanosleep(int $seconds, int $nanoseconds): array|bool

Atrasa a execução do programa pelo número de segundos informado em seconds e de nanossegundos informado em nanoseconds.

Parâmetros

seconds

Deve ser um inteiro não negativo.

nanoseconds

Deve ser um inteiro não negativo menor que um 1 bilhão.

Nota: No Windows, o sistema pode atrasar mais que o número de nanossegundos informado, dependendo do equipamento.

Valor Retornado

Retorna true em caso de sucesso ou false em caso de falha.

Se o atraso foi interrompido por um sinal, um array associativo será retornado com os componentes:

  • seconds - número de segundos remanescentes no atraso
  • nanoseconds - número de nanossegundos remanescentes no atraso

Exemplos

Exemplo #1 Exemplo de time_nanosleep()

<?php
// Cuidado! Não vai funcionar como esperado se um array for retornado
if (time_nanosleep(0, 500000000)) {
echo
"Dormi por meio segundo.\n";
}

// Assim é melhor:
if (time_nanosleep(0, 500000000) === true) {
echo
"Dormi por meio segundo.\n";
}

// E assim é o melhor:
$nano = time_nanosleep(2, 100000);

if (
$nano === true) {
echo
"Dormi por 2 segundos, 100 microssegundos.\n";
} elseif (
$nano === false) {
echo
"Pausa falhou.\n";
} elseif (
is_array($nano)) {
$seconds = $nano['seconds'];
$nanoseconds = $nano['nanoseconds'];
echo
"Interrompido por um sinal.\n";
echo
"Tempo remanescente: $seconds segundos, $nanoseconds nanossegundos.";
}
?>

Veja Também

add a note

User Contributed Notes 5 notes

up
8
m at kufi dot net
18 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
5
anybody (a) emuxperts.net
17 years ago
Documentation states that "seconds" must be positive. This is not correct, 0 is possible.

Rather, "seconds" must be non-negative.
up
5
fantasysportswire at yahoo dot com
17 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
15 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
-11
tecnomaniac at ig dot com dot br
18 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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