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Date: Fri, 18 Jan 2008 10:51:14 -0500
To: "Scott MacVicar" <scottmac@php.net>
Cc: internals@lists.php.net
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References: <78c6bd860801172346tab2dd81p841511ee07d15a5e@mail.gmail.com>
	 <47907E9A.9070401@php.net>
Subject: Re: [PHP-DEV] Asymmetric Module Init / Deinit
From: ioplex@gmail.com ("Michael B Allen")

On 1/18/08, Scott MacVicar <scottmac@php.net> wrote:
> Apache children get killed and re-spawned after the number of requests
> defined by MaxRequestsPerChild, the default is 10,000. Though MINI
> talways get called for each child spawned.
>
> Is Apache using pre-fork or worker?

Pre-fork.

That's weird. I set MaxRequestPerChild to 100, ran ab -n 500 url and I
can see workers being destroyed and created but I only see MINIT being
called once on startup. As workers exit I see MSHUTDOWN but no
corresponding MINIT. Just to be sure my log apparatus wasn't setup yet
I wrote a message to stderr, flushed it and verified that it's in the
Apache error_log.

I'm pretty sure MINIT gets called on startup and MSHUTDOWN gets called
every time a child exits.

I used stock Apache 2.2.6 and PHP 5.2.5 with the standard Apache 2
build instructions [1] (although I did not compile php --with-mysql)
on x86_64-redhat-linux.

Mike

[1] http://www.php.net/manual/en/install.unix.apache2.php

> Michael B Allen wrote:
> > I have someone using my extension who is seeing some strange behavior
> > where the module initializes which Apache starts, the extension works
> > perfectly and then, without warning, after about 40 seconds, the
> > deinitialization routine runs. This kills some state in a global
> > context and everything goes very badly from there. Otherwise, Apache
> > is still running just fine.
> >
> > The setup is Apache 2.2 / PHP 5.2 on Fedora 7.
> >
> > I personally have not been able to replicate this problem but I'm
> > thinking it must be an Apache worker exiting that's triggering deinit.
> > I know Apache 1.x has that behavior and I'm wondering if anyone knows
> > if 2.2 exhibits that behavior. It's annoying because it means that the
> > module initialization is called once whereas the deinitialization
> > routine is called many times.
> >
> > Does this sound familiar to anyone?
> >
> > I would appreciate any insight as to how I can ensure that my module
> > is deinitialized only once. My first thought is to simply save the pid
> > of the process that initialized the module and check for it in the
> > deinitialization routine.
> >
> > Mike
> >
>


-- 
Michael B Allen
PHP Active Directory SPNEGO SSO
http://www.ioplex.com/