Forking

["Cameron B. Prince" <cp...@rideware.com>]

Hi all,

I have an Embperl page that uses a custom module which has code that calls
an external perl script via fork. This script takes a considerable amount of
time to run and I need it to just run in the background. I've gotten it to
work but I'm noticing that I've got zombies once the processes complete
until I restart Apache.

Here's the code:

   my $pid;

   unless ($pid = fork) {
      local($SIG{HUP}) = 'IGNORE';
      local($SIG{USR1}) = 'IGNORE';
      local($SIG{USR2}) = 'IGNORE';
      exec $command;
      die "no exec";
      exit 0;
   }

Am I missing a signal or something to run this command as an entirely
stand-alone process?

Thanks,
Cameron


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Re: Forking

[Neil Gunton <ne...@nilspace.com>]

"Cameron B. Prince" wrote:
> 
> Hi all,
> 
> I have an Embperl page that uses a custom module which has code that calls
> an external perl script via fork. This script takes a considerable amount of
> time to run and I need it to just run in the background. I've gotten it to
> work but I'm noticing that I've got zombies once the processes complete
> until I restart Apache.
> 
> Here's the code:
> 
>    my $pid;
> 
>    unless ($pid = fork) {
>       local($SIG{HUP}) = 'IGNORE';
>       local($SIG{USR1}) = 'IGNORE';
>       local($SIG{USR2}) = 'IGNORE';
>       exec $command;
>       die "no exec";
>       exit 0;
>    }
> 
> Am I missing a signal or something to run this command as an entirely
> stand-alone process?

This document talks about the correct way to fork from mod_perl:

http://perl.apache.org/docs/1.0/guide/performance.html#Forking_and_Executing_Subprocesses_from_mod_perl

Hope this helps...

/Neil

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