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Posted by "Richard Lynch" on 06/14/60 11:17
On Mon, May 30, 2005 7:17 pm, Peter Brodersen said:
> On Mon, 30 May 2005 21:08:29 -0400, in php.general
> robert@interjinn.com (Robert Cummings) wrote:
>
>>Sorry to hijack this thread but I was wondering how to make a script
>>sleep for 5 seconds?
sleep(5);
> Easy:
> <?php
> for($i=0;$i<5;$i++) sleep(1);
> ?>
>
> Or better:
> <?php
> $endtime = time()+5;
> while (time() != $endtime);
> ?>
This runs the risk of somebody adding some code in there that takes longer
than a second to run, and then suddenly it's in an infinite loop because
the $endtime is never EQUAL to time()
Safe to say while (time() <= $endtime)
> Or even better:
> <?php
> $endtime = time()+5;
> while (`date +%s` != $endtime);
Gak!
Why would you shell out to do this?
> ?>
>
> We have busy wait, we have risk of indefinite loops. The next step
> should be (more) imprecision. Maybe read /proc/cpuinfo and perform n
> steps of simple loop where n is calculated from the cpu type, mhz and
> current load. Maybe a PEAR project?
>
> --
> - Peter Brodersen
>
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