time_nanosleep

(PHP 5)

time_nanosleepDelay for a number of seconds and nanoseconds

Opis

mixed time_nanosleep ( int $seconds , int $nanoseconds )

Delays program execution for the given number of seconds and nanoseconds.

Parametry

seconds

Must be a non-negative integer.

nanoseconds

Must be a non-negative integer less than 1 billion.

Zwracane wartości

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

If the delay was interrupted by a signal, an associative array will be returned with the components:

  • seconds - number of seconds remaining in the delay
  • nanoseconds - number of nanoseconds remaining in the delay

Rejestr zmian

Wersja Opis
5.3.0 This function is now available on Windows platforms.

Przykłady

Przykład #1 time_nanosleep() example

<?php
// Careful! This won't work as expected if an array is returned
if (time_nanosleep(0500000000)) {
    echo 
"Slept for half a second.\n";
}

// This is better:
if (time_nanosleep(0500000000) === true) {
    echo 
"Slept for half a second.\n";
}

// And this is the best:
$nano time_nanosleep(2100000);

if (
$nano === true) {
    echo 
"Slept for 2 seconds, 100 microseconds.\n";
} elseif (
$nano === false) {
    echo 
"Sleeping failed.\n";
} elseif (
is_array($nano)) {
    
$seconds $nano['seconds'];
    
$nanoseconds $nano['nanoseconds'];
    echo 
"Interrupted by a signal.\n";
    echo 
"Time remaining: $seconds seconds, $nanoseconds nanoseconds.";
}
?>

Zobacz też:

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User Contributed Notes 5 notes

up
6
fantasysportswire at yahoo dot com
8 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
4
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
3
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
1
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
-1
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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