Mailing List Archive: ModPerl: ModPerl

code in <perl> sections executed twice in same process?

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pc88mxer at gmail

Nov 16, 2009, 2:10 PM

Post #1 of 4 (224 views)
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code in <perl> sections executed twice in same process?

Hi -

I am using mod-perl 1.3.41 with perl 5.8.9.

The only perl I have in my config file is:

<Perl>
warn "This is a <perl> section in process $$ at time @{[time]}\n";
sleep(5);
warn "Done sleeping\n";
</Perl>

When I start it up in single process mode (-X), I'll something like
this on stderr (to the console):

This is a <perl> section in process 25597 at time 1258408992
Done sleeping

And also in the error log I'll see:

This is a <perl> section in process 25597 at time 1258408998
Done sleeping

The pids will be the same, but the times will be different (about 5
secs. apart.)

Is this "normal", and what can I do so that the code in <Perl>
sections is only executed once in the parent process?

Thanks,
ER

aw at ice-sa

Nov 16, 2009, 2:41 PM

Post #2 of 4 (206 views)
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Re: code in <perl> sections executed twice in same process? [In reply to]

E R wrote:
...
>
> Is this "normal", and what can I do so that the code in <Perl>
> sections is only executed once in the parent process?
>
I believe it is "normal", in the sense that Apache actually parses its
configuration at least twice : one time "just for checking", then it
throws everything away and parses it a second time "for real".

Then it will even (probably) run your section again, each time it starts
a new child process.

You probably really want to read the following 2 pages :
http://perl.apache.org/docs/2.0/user/handlers/server.html
http://perl.apache.org/docs/2.0/user/config/custom.html

pc88mxer at gmail

Nov 17, 2009, 11:48 AM

Post #3 of 4 (197 views)
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Re: code in <perl> sections executed twice in same process? [In reply to]

The <perl> sections don't seem to be executed in the children.

Is there a way to determine which pass you are in?

For large mod_perl apps, is there a way to avoid loading your code in twice?

Note I am using mod_perl 1.3.41.

Thanks,
ER

On Mon, Nov 16, 2009 at 4:41 PM, André Warnier <aw [at] ice-sa> wrote:
> E R wrote:
> ...
>>
>> Is this "normal", and what can I do so that the code in <Perl>
>> sections is only executed once in the parent process?
>>
> I believe it is "normal", in the sense that Apache actually parses its
> configuration at least twice : one time "just for checking", then it throws
> everything away and parses it a second time "for real".
>
> Then it will even (probably) run your section again, each time it starts a
> new child process.
>
> You probably really want to read the following 2 pages :
> http://perl.apache.org/docs/2.0/user/handlers/server.html
> http://perl.apache.org/docs/2.0/user/config/custom.html
>
>

adam.prime at utoronto

Nov 17, 2009, 12:03 PM

Post #4 of 4 (197 views)
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Re: code in <perl> sections executed twice in same process? [In reply to]

E R wrote:
> The <perl> sections don't seem to be executed in the children.

use a PerlChildInitHandler if you want to run code in the children.

> Is there a way to determine which pass you are in?
>
> For large mod_perl apps, is there a way to avoid loading your code in twice?
>
> Note I am using mod_perl 1.3.41.

In mp1, use $Apache::Server::Starting, and $Apache::Server::ReStarting.
see here:

http://perl.apache.org/docs/1.0/guide/config.html#Apache_Restarts_Twice_On_Start

Adam

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