> -----Original Message-----
> From: Brad Fuller [mailto:[EMAIL PROTECTED]
> Sent: Monday, April 30, 2007 10:55 AM
> To: [email protected]
> Subject: [PHP] Run a script apart from request
>
> Hi all,
>
> I am developing a program that does some intensive data processing,
and is
> triggered from a page hit and/or a SOAP request.
>
> The processing takes on average 30 seconds to 1 minute, which is OK
for a
> web page (I can use set_time_limit(0) and just display a
pseudo-progress bar
> animated gif and a "Please wait..." message) but I can't leave the
SOAP
> request hanging for that long. I need to send a response immediately.
>
> What I really need to do is acknowledge the client that their request
has
> been received and will be processed, and terminate that request... and
THEN
> begin the processing.
>
> One way I thought of doing it would be to put the requests into the
database
> and run a cron job every X minutes, but I would like to avoid this if
at all
> possible.
>
> Someone had suggested pcntl_fork() but I'm not sure if that will
accomplish
> what I need it to... if I fork(), then send a response, kill the
parent and
> let the child run the process, will the HTTP request wait for the
child or
> will it die with the parent (like I want it to) ?
>
> Any advice is much appreciated.
>
> Thx,
>
> Brad
>
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I am not completely familiar with how forking works in PHP applications,
but I am fairly familiar with how it works in UNIX. If you kill the
parent process, I believe it will close the HTTP request, but since it
doesn't handle the SIGCHLD signal after the child is done, the child
process will be left as a zombie process. I believe the only way to
catch the SIGCHLD is to have the script pcntl_waitpid(), which would
then hang the HTTP request.
I haven't tested this, but you can easily test it by:
$pid = pcntl_fork();
if($pid == -1) {
// Something went wrong (handle errors here)
} elseif($pid == 0) {
// This part is only executed in the child
usleep(5000000); //wait 5 seconds... see if the request hangs here
} else {
die();
}
Then wait and see what happens.
Maybe there is someone more experience in this area that can put a few
words in, but that is what I believe to be the case.
-Logan
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