You are viewing a plain text version of this content. The canonical link for it is here.
Posted to modperl@perl.apache.org by martin langhoff <ma...@scim.net> on 2000/08/29 16:49:09 UTC
[OT]starting a long running script
hi,
i need to start a long-running script from either mod_perl or mod_cgi,
and I'm facing all the well-known issues: the apache child waits, until
it waits no longer (maybe because the browser itself chose to close the
TCP connection, maybe because of an internal timeout), and then the
script gets killed.
there is no useful information to echo back to the user, besides
teloing him the script started ok.
the problem is: while I'm familiar with the problems, but not with the
solutions. I've read that one possible solution is to use fork(), but I
have no experience with it, and not much understanding of its
implications, and after reading perlfunc I'm more confused than before.
is there anyone kind enough to tell me where to start Reading TFM or
which particular FM contains useful leads?
thanks!
martin
Re: [OT]starting a long running script
Posted by Stas Bekman <st...@stason.org>.
On Tue, 29 Aug 2000, T.J. Mather wrote:
> The easiest way to do this (IMHO) is to use the register_cleanup method in
> mod_perl. This gets executed at the very end of the request cycle after
> the TCP connection gets closed. See page 367 of the Eagle book for
> details...
>
> Basically you want to do this:
>
> $r = Apache->request;
> $r->register_cleanup( sub { system("/path/to/your/script.pl"); } );
I'm not sure that this is a good suggestion. While it will let the
connection off before starting the process, it'll keep the mod_perl
process busy!!! which is something you really don't want to happen. See
the URL from my previous post that does the work cleanly and fast. Of
course you might want to deploy on of the described techniques in the
register_cleanup() mode...
> -T.J. Mather
>
> On Tue, 29 Aug 2000, martin langhoff wrote:
>
> > i need to start a long-running script from either mod_perl or mod_cgi,
> > and I'm facing all the well-known issues: the apache child waits, until
> > it waits no longer (maybe because the browser itself chose to close the
> > TCP connection, maybe because of an internal timeout), and then the
> > script gets killed.
> >
> > there is no useful information to echo back to the user, besides
> > teloing him the script started ok.
> >
> > the problem is: while I'm familiar with the problems, but not with the
> > solutions. I've read that one possible solution is to use fork(), but I
> > have no experience with it, and not much understanding of its
> > implications, and after reading perlfunc I'm more confused than before.
>
>
_____________________________________________________________________
Stas Bekman JAm_pH -- Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide http://perl.apache.org/guide
mailto:stas@stason.org http://apachetoday.com http://jazzvalley.com
http://singlesheaven.com http://perlmonth.com perl.org apache.org
Re: [OT]starting a long running script
Posted by "T.J. Mather" <tj...@thoughtstore.com>.
The easiest way to do this (IMHO) is to use the register_cleanup method in
mod_perl. This gets executed at the very end of the request cycle after
the TCP connection gets closed. See page 367 of the Eagle book for
details...
Basically you want to do this:
$r = Apache->request;
$r->register_cleanup( sub { system("/path/to/your/script.pl"); } );
-T.J. Mather
On Tue, 29 Aug 2000, martin langhoff wrote:
> i need to start a long-running script from either mod_perl or mod_cgi,
> and I'm facing all the well-known issues: the apache child waits, until
> it waits no longer (maybe because the browser itself chose to close the
> TCP connection, maybe because of an internal timeout), and then the
> script gets killed.
>
> there is no useful information to echo back to the user, besides
> teloing him the script started ok.
>
> the problem is: while I'm familiar with the problems, but not with the
> solutions. I've read that one possible solution is to use fork(), but I
> have no experience with it, and not much understanding of its
> implications, and after reading perlfunc I'm more confused than before.
Re: [OT]starting a long running script
Posted by Stas Bekman <st...@stason.org>.
On Tue, 29 Aug 2000, martin langhoff wrote:
> hi,
>
> i need to start a long-running script from either mod_perl or mod_cgi,
> and I'm facing all the well-known issues: the apache child waits, until
> it waits no longer (maybe because the browser itself chose to close the
> TCP connection, maybe because of an internal timeout), and then the
> script gets killed.
>
> there is no useful information to echo back to the user, besides
> teloing him the script started ok.
>
> the problem is: while I'm familiar with the problems, but not with the
> solutions. I've read that one possible solution is to use fork(), but I
> have no experience with it, and not much understanding of its
> implications, and after reading perlfunc I'm more confused than before.
>
> is there anyone kind enough to tell me where to start Reading TFM or
> which particular FM contains useful leads?
Very good FM :)
http://perl.apache.org/guide/performance.html#Forking_and_Executing_Subprocess
>
> thanks!
>
>
> martin
>
_____________________________________________________________________
Stas Bekman JAm_pH -- Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide http://perl.apache.org/guide
mailto:stas@stason.org http://apachetoday.com http://jazzvalley.com
http://singlesheaven.com http://perlmonth.com perl.org apache.org