On Sat, 2009-01-24 at 00:22 +0200, Török Alpár wrote:
> as i said it's hate here, and i might be wrong but consider the following :
>
> for($icount=0;$icount<11;$icount++)
> {
> $iPid = pcntl_fork();
> $iChildrenCount = 0;
> if ($iPid == 0)
> {
> // child
> echo ("child $icount\n");
> }
> else
> {
> // parrent
> }
> }
>
> this is essential what you do in your example? If so, this code does not
> start 10 children. It starts more.
>
> 2009/1/23 Nathan Rixham <nrixham@xxxxxxxxx>
>
> > Török Alpár wrote:
> >
> >> 2009/1/23 Nathan Rixham <nrixham@xxxxxxxxx>
> >>
> >> bruce wrote:
> >>>
> >>> A simple question (or so I thought).
> >>>>
> >>>> Does php allow an app to create/start a process/application that can
> >>>> continue to run on its own, after the initiating program/app terminates?
> >>>>
> >>>> It appears that the spawning/forking functions might work, but the child
> >>>> apps would be in a zombie status, and couldn't be killed by an external
> >>>> program.
> >>>>
> >>>>
> >>>> you keep mentioning this zombie state; make sure that all you're child
> >>> processes have an exit(); at the end or at the end of the code where they
> >>> are finished; otherwise you get the xombies!
> >>>
> >>> also here is a very simple model you can follow that invariably works for
> >>> me:
> >>>
> >>> this will run 10 worker threads:
> >>>
> >>> controller:
> >>> <?php
> >>> include './your.framework.php';
> >>> for($icount=0;$icount<11;$icount++) {
> >>> include './worker.php';
> >>> }
> >>> ?>
> >>>
> >>> worker:
> >>> <?php
> >>> $pid=pcntl_fork();
> >>> if(!$pid) {
> >>> while(1) {
> >>> if($icount) {
> >>> $offset = $icount * 50;
> >>> } else {
> >>> $offset = 0;
> >>> }
> >>> $db = new mysql_handler( $connection );
> >>> $job_list = new job_list;
> >>> if( $jobs = $job_list->get($offset) ) {
> >>> foreach($jobs as $jdex => $job ) {
> >>> //do something with the job
> >>> }
> >>> } else {
> >>> sleep(10);
> >>> }
> >>> }
> >>> } else {
> >>> echo "\ndaemon launcher done id $pid\n";
> >>> }
> >>> ?>
> >>>
> >>
> >> This would start more than 10 children. Children will continue on with for
> >> loop after they do their work. As you advice that the children have an
> >> exit,
> >> i assume that you just overlooked it while writing this example. Also, a
> >> wait on the children, at some point, gets rid of the zombies, as i see
> >> from
> >> your code, there is no way you won't have zombie processes, unless the
> >> parent exists, and then the zombies also disappear.
> >>
> >> I hope i got it right, it's late here :)
> >>
> >>
> >>
> > lol the script will only run 10 children, and as mentioned directly below,
> > it is designed to run forever - the example doesn't fit the exact needs, but
> > following bruces earlier posts this may be a model he can follow. I'm aware
> > it could be fleshed out with much more code and error handling, but it's
> > just a little model to get one started :)
> >
> > regards torak and hope you're well!
> >
> >
> > the above code is designed to run indefinately in a constant loop which
> >>> polls a database for work to do
> >>>
> >>> this is just a very simple example, there are far more complex ways of
> >>> doing it, keeping a track of how many processes you have, spawning new
> >>> ones
> >>> when you need them etc etc, but this i find works v well for me, the key
> >>> is
> >>> the $offset; getting jobs from a database and this literally is the
> >>> offset
> >>> used, so if you have say 200 emails to get and each script processes 50
> >>> at a
> >>> time, only 4 of your threads are working, bump it up to 10000 and all of
> >>> them work until the queue drops; the sleep(10) and the spawn process of
> >>> about 1 per second ensures that you're polling every second so jobs are
> >>> picked up quickly. it's a lot of functionality for so little code :)
> >>>
> >>>
> >>>
> >>> --
> >>> PHP General Mailing List (http://www.php.net/)
> >>> To unsubscribe, visit: http://www.php.net/unsub.php
> >>>
> >>>
> >>>
> >>
> >>
> >
>
>
I think possibly you want to execute a new script of non-PHP origin? In
which case, using exec() and calling a script with an & (meaning to run
in the background) and passing output to /dev/null should do the trick.
Ash
www.ashleysheridan.co.uk
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