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Posted to modperl@perl.apache.org by Marcin Kosewski <M....@itl.waw.pl> on 2004/11/18 03:21:37 UTC
PerlRequire script starts two times - how to avoid this
Hi Gurus,
I'm using Apache 1.3.33 with mod_perl 1.29. In Apache httpd.conf file I'm
loading external perl directives using:
PerlRequire startup.pl
I've checked, that during apache startup 'startup.pl' runs two times. And
I want, that this script runs only once (because I'm allocating there
shared memory areas for later use).
So, question is: how to force Apache to run this script exactly once during
startup.
In my other servers with previous versions of Apache and mod_perl I've used
in startup script directive:
return 1 if ( getppid() != 1 );
and it solved the problem - commands after this one were executed only
once. But now it doesn't work.
I've tried this in startup.pl:
WriteToDebugFile( "begin, getppid=".getppid()." getpid=".$$." );
return 1 if ( getppid() != 1 );
WriteToDebugFile( "Done" );
And after apache run i've found in debug-file this:
begin, getppid=1005 getpid=1006
begin, getppid=1005 getpid=1006
I've checked pid's of starting Apache processes:
1. I've started Apache:
sh /www/apache_1.3.33/bin/apachectl start
(Pid: 1005, Parent: 1004)
2. One process was started
/www/apache_1.3.33/bin/httpd -f /www/conf/httpd.conf
(Pid: 1006, Parent: 1005)
3. After some time (and executing TWO times startup.pl) apache was ready:
/www/apache_1.3.33/bin/httpd -f /www/conf/httpd.conf
(Pid:1009, Parent: 1)
/www/apache_1.3.33/bin/httpd -f /www/conf/httpd.conf
(Pid: 1012, Parent 1009)
.
.
.
(other workers)
--
| Marcin Kosewski
| M.Kosewski@itl.waw.pl
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|
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Re: PerlRequire script starts two times - how to avoid this
Posted by Perrin Harkins <pe...@elem.com>.
On Thu, 2004-11-18 at 11:55, John Wittkoski wrote:
> The code is _always_ called twice (i.e. when I do a start OR restart)
> and $Apache::Server::Starting is always true the first time it's called
> but not the second and $Apache::Server::ReStarting is always false.
>
> That is, when starting the server I see:
>
> Called
> Server is Starting
> Called
With mod_perl 1.29 and Perl 5.8.3 I see this from my startup.pl:
Called
Server is Starting
The versions may make a difference here. Anyway, there is a simpler way
to make sure you don't do things twice: put them in a module and call
the module via "use" in your startup.pl.
- Perrin
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Apache::Session delete error
Posted by Bart Simpson <ba...@yahoo.com>.
HI. I've been working on this for over a day now.
Truth is i don't really understand the nature of the
problem. Google give many old results for setgid
problems. If some wise perl programmer could help, i'd
be much obliged.
I'm getting this error when I call
tied(%session)->delete.
-e: Insecure dependency in unlink while running
setgid at
/usr/lib/perl5/site_perl/5.8.3/Apache/Session/Store/File.pm
line 106.
Here is relevant 106 area.
if (-e $directory.'/'.$session->{data}->{_session_id})
{
unlink
($directory.'/'.$session->{data}->{_session_id}) ||
die "Could not remove file: $!";
}
I saw this on perlmonks and untied my session before
processing the template but that didn't help.
[quote]
If you really want to use Apache::Session rather than
something simpler like MLDBM::Sync, I suggest you
treat it as a hot potato, i.e. create the hash, get
what you want in and out of it as fast as you can, and
get rid of it immediately. Don't leave it hanging
around while you do other stuff.
[/quote]
Thank you very much.
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Re: PerlRequire script starts two times - how to avoid this
Posted by John Wittkoski <jo...@aol.com>.
Stas Bekman wrote on 11/17/04, 10:34 PM:
> Marcin Kosewski wrote:
> > Hi Gurus,
> >
> > I'm using Apache 1.3.33 with mod_perl 1.29. In Apache httpd.conf
> file I'm
> > loading external perl directives using:
> > PerlRequire startup.pl
> >
> > I've checked, that during apache startup 'startup.pl' runs two
> times. And
> > I want, that this script runs only once (because I'm allocating there
> > shared memory areas for later use).
> >
> > So, question is: how to force Apache to run this script exactly once
> during
> > startup.
>
>
http://perl.apache.org/docs/1.0/guide/config.html#Apache_Restarts_Twice_On_Start
>
>
While this does explain why the server needs to restart twice, I thought
I'd mention for Marcin's sake that with 1.3.x $Apache::Server::Starting
and $Apache::Server::ReStarting don't (in my experience) work as expected.
When I put this slightly modified code in my httpd.conf:
<Perl>
open(OUT, ">/tmp/log");
print OUT "Called\n";
print OUT "Server is Starting\n" if $Apache::Server::Starting;
print OUT "Server is ReStarting\n" if $Apache::Server::ReStarting;
close(OUT);
</Perl>
(I write to a temp file instead of STDERR because under apache 1.3
logging to STDERR during startup isn't always redirected...)
The code is _always_ called twice (i.e. when I do a start OR restart)
and $Apache::Server::Starting is always true the first time it's called
but not the second and $Apache::Server::ReStarting is always false.
That is, when starting the server I see:
Called
Server is Starting
Called
And when restarting:
Called
Server is Starting
Called
Because of this, you can't actually tell the difference between starting
and restarting.
I know this has been discussed on the list before, but I just thought
I'd save him the same frustration I went though trying to do this.
--John
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Re: PerlRequire script starts two times - how to avoid this
Posted by Stas Bekman <st...@stason.org>.
Marcin Kosewski wrote:
> Hi Gurus,
>
> I'm using Apache 1.3.33 with mod_perl 1.29. In Apache httpd.conf file I'm
> loading external perl directives using:
> PerlRequire startup.pl
>
> I've checked, that during apache startup 'startup.pl' runs two times. And
> I want, that this script runs only once (because I'm allocating there
> shared memory areas for later use).
>
> So, question is: how to force Apache to run this script exactly once during
> startup.
http://perl.apache.org/docs/1.0/guide/config.html#Apache_Restarts_Twice_On_Start
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