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Want my perl CGI program to continue without waiting for return from a subroutine

Posted on 2007-12-04
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Last Modified: 2013-12-25
Hi,
I'm writing perl CGI programs that will run a Web site.  On one page, if the user clicks on a link, he initiates some processing, and he'll be taken to another page.  The processing will read data from a couple other Web sites, process the data, and send email to the user.  But there's no reason the user should have to wait for all that to happen before being sent to the next page for him to view.  The processing could happen in the background, so to speak.

I'd like to find a way for the program that initiates the processing to continue, sending the user to his new page, without waiting for the processing to finish.  Is there a way to do that?
Thanks,
--Steve

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Question by:StevenMiles
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Adam314 earned 1000 total points
ID: 20404206
You should fork the main process.
http://perldoc.perl.org/functions/fork.html
This will split the main process into to: a parent and a child.
You should have the parent continue with whatever it should do.
Have the child call the subroutine that does the background processing.

eg:
my $pid=fork;
die "Could not fork: $!\n" unless defined $pid;
if(!$pid) {
    #This is the child
    your_subroutine();
    exit;
}
#Parent continues here
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