Re: Interesting sleep() side-effect

It's fine actually. Our timer times actual CPU time, not real time. sleep() does not consume any CPU time, so the script will not timeout for quite a while. This is actually quite intentional... Zeev At 00:49 27/01/99 -0500, Rasmus Lerdorf wrote: >In testing Thies' connection abort detection code, completely unrelated to >his stuff, I noticed an interesting side-effect of calling sleep() in a >PHP script. I have tried this on both Linux and Solaris and get the same >results. Could you guys with access to other OS'es try this one? > ><? > set_time_limit(5); > register_shutdown_function("done"); > function done() { > global $i; > > $fp = fopen("/tmp/done","w"); > fputs($fp,"i reached $i\n"); > fclose($fp); > } > > for($i=0; $i<30000; $i++) { > for($j=0;$j<1000;$j++) $a=sqrt($j); > /* sleep(1); */ > echo "$i > ................................................................................<br>"; > flush(); > } >?> > > >This script should run for 5 seconds, unless of course you are on a >massively fast machine that can do 30000 sqrt()'s in 5 seconds. However, >when you uncomment the sleep(1) call there, it will happily run way past 5 >seconds. Looks to me like the sleep() system call is interfering with our >itimer. The man pages state that sleep() may be implemented as a SIGALRM, >but we are using a SIGPROF itimer, so I thought we were actually safe >here. > >It doesn't worry me too much. It is more an interesting side effect, but >something we might want to document as a caveat in the sleep() >documentation. I would be intersted in hearing if this behaviour is >consistent across all the operating systems. > >The "/tmp/done" file is not related to this particular message. That's >just how I am testing to see if PHP catches when the client closes the >socket. > >-Rasmus > > >-- >PHP Development Mailing List http://www.php.net/ >To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net >For help: php-dev-help@lists.php.net > > > -- Zeev Suraski <zeev@zend.com> http://www.zend.com/ For a PGP public key, finger bourbon@netvision.net.il -- PHP Development Mailing List http://www.php.net/ To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net For help: php-dev-help@lists.php.net