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List:       apache-modules
Subject:    Re: [apache-modules] Re: Thread
From:       "howard J meadows" <h_j_meadows () lycos ! com>
Date:       2004-01-13 17:29:49
Message-ID: FNNHMGGJOIHAMBAA () mailcity ! com
[Download RAW message or body]

What platfrom are you running on?
If you're running on Linux pthreads often don't work anyhow (even with Apache2)(you \
usually need a different kernel). On Apache1.3 you can't use pthreads to start off \
requests / sub-requests without that weird behaviour discussed. But you should be \
able to use them for simpler tasks.

HTH

Howard
--

--------- Original Message ---------

DATE: Tue, 13 Jan 2004 18:02:32
From: Marco Spinetti <m.spinetti@pisa.iol.it>
To: apache-modules@covalent.net
Cc: 

> No,
> 
> I'm starting threads in child process (inside handler function) not 
> during reading of configuration data.
> 
> Reading your email it seems that using pthreads inside child process in 
> apache 1.3.x gives strange results and it will not work as expected, 
> while using apache 2 all is ok.
> 
> Is it true?
> 
> If it is, I have a big problem becasue  my module is for apache 1.3.x
> 
> 
> What is the right and real answer?
> 
> Regards
> 
> 
> --Marco
> 
> 
> 
> Alex (Oleksiy) Bolgarov wrote:
> 
> > --- Marco Spinetti <m.spinetti@pisa.iol.it> wrote: >
> > Hi all,
> > 
> > 
> > > I have implemented my module: inside it I start 5
> > > pthreads. Each one 
> > > starts a different connection.
> > > 
> > > I'm using apache 1.3.27.
> > > 
> > > My big problem is if I start apache with:
> > > 
> > > /usr/local/apache/bin/httpd -X -f
> > > /usr/local/apache/conf/httpd.conf -c 
> > > 'Port 80'
> > > 
> > > all is ok.
> > > 
> > > But if I start apache normally
> > > (/usr/local/apache/bin/apachectl start) 
> > > my apache module never returns from
> > > pthread_cond_wait.
> > > 
> > > 
> > 
> > 
> > Apache 1.3.X forks child processes to process
> > requests. You should remember that after fork(), in
> > the child process only one thread is running - the one
> > that calls fork() (see man pthread_atfork, or even
> > better google for pthread_atfork()). I guess you start
> > therads when you are reading configuration directievs,
> > right? Those threads are staretd in the parent Apache
> > process. When Apache decides it needs to start new
> > child process to process a request, it fork()s, and in
> > the child process your threads just are not running!
> > 
> > Now, you do not see this when starting Apache with -X
> > option, because, if I remember correctly, -X means
> > "run Apache in one process without forking", to
> > provide nice debug environment for module development.
> > If you run Apache via apachectl, no -X option is given
> > to httpd and Apache start forking new processes.
> > 
> > So, this means bacically that you _can_ use threads in
> > Apache 1.3 module, in a sence that it will compile and
> > run without crashes, but it usually will not work as
> > expected.
> > 
> > On the other hand I have very positive experience
> > using threads in the module for Apache 2 with "worker"
> > or "perchild" MPMs. You just make sure that you start
> > threads in the child process, not ini parent during
> > reading of configuration data.
> > 
> > 
> > Thank you, 
> > 
> > alex.
> > 
> > ______________________________________________________________________ 
> > Post your free ad now! http://personals.yahoo.ca
> > 
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> > 
> > 
> > 
> > 
> 
> 
> 
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> 



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