time_nanosleep

(PHP 5, PHP 7, PHP 8)

time_nanosleep — Delay for a number of seconds and nanoseconds

Опис

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

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

Параметри

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

Зауваження: On Windows, the system may sleep longer that the given number of nanoseconds, depending on the hardware.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки.

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

Приклади

Приклад #1 time_nanosleep() example

<?php
// Careful! This won't work as expected if an array is returned
if (time_nanosleep(0, 500000000)) {
    echo "Slept for half a second.\n";
}

// This is better:
if (time_nanosleep(0, 500000000) === true) {
    echo "Slept for half a second.\n";
}

// And this is the best:
$nano = time_nanosleep(2, 100000);

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.";
}
?>

Прогляньте також

sleep() - Delay execution
usleep() - Delay execution in microseconds
time_sleep_until() - Make the script sleep until the specified time
set_time_limit() - Limits the maximum execution time

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User Contributed Notes 4 notes

down

m at kufi dot net ¶

19 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.";
 ?>

down

anybody (a) emuxperts.net ¶

18 years ago

Documentation states that "seconds" must be positive. This is not correct, 0 is possible.

Rather, "seconds" must be non-negative.

down

fantasysportswire at yahoo dot com ¶

18 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 :( .....

down

b dot andrew at shaw dot ca ¶

16 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!

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