Apache::ASP fork
I am trying to do a simple fork from within a Apache::ASP script.
The code is as follows:
<%
if($pid = fork) {
%>
DONE...
<%
} elsif(defined $pid) {
system("java PursuitSpider > stdout.txt");
system("gzip stdout.txt");
}
%>
I am forking b/c PursuitSpider takes about 2 hrs to run. The above works
ok but I end up with a defunct libhttpd.ep process left around. I tried
to setpgrp(0, $$) and POSIX::setsid() from within the child code but
neither seem to detach correctly. Is there something else I need to do?
-jason
[EMAIL PROTECTED]
[EMAIL PROTECTED]
Re: Apache::ASP fork
> <%
> if($pid = fork) {
> %>
> DONE...
> <%
> } elsif(defined $pid) {
> system("java PursuitSpider > stdout.txt");
> system("gzip stdout.txt");
> }
> %>
> ok but I end up with a defunct libhttpd.ep process left around.
You need to exit after the second system(). However, you have a
presumably huge mod_perl process only running two system() calls, so I
suggest you use exec() instead of system() + exit().
One catch: you have to commands to execute and not one. exec()uting the
following small sh script would do the trick:
#!/bin/sh
java PursuitSpider > stdout.txt
gzip stdout.txt
or you could call exec() as follows:
exec('sh -c "java PursuitSpider > stdout.txt; gzip stdout.txt"');
Btw, I believe Java has built in support for gzip compression in the
java.util.zip package which is part of the java API.
ELB
--
Eric L. Brine | Chicken: The egg's way of making more eggs.
[EMAIL PROTECTED] | Do you always hit the nail on the thumb?
ICQ# 4629314 | An optimist thinks thorn bushes have roses.
Re: Apache::ASP fork
Jason Horman wrote:
>
> I am forking b/c PursuitSpider takes about 2 hrs to run. The above works
> ok but I end up with a defunct libhttpd.ep process left around. I tried
> to setpgrp(0, $$) and POSIX::setsid() from within the child code but
> neither seem to detach correctly. Is there something else I need to do?
>
In general, people find that forking & mod_perl are not
a good mix. If you are going to get it to work, you need
to set
$SIG{CHLD} = 'IGNORE';
before the fork, so you don't leave your child processes zombied.
Another way of doing this, should you run into other fork
problems, is insert a run record into a database that gets
picked up by a cron job later, and forks off a PursuitSpider
when relevant.
-- Joshua
_
Joshua Chamas Chamas Enterprises Inc.
NodeWorks >> free web link monitoring Huntington Beach, CA USA
http://www.nodeworks.com1-714-625-4051
