integrating guile in an apache module

integrating guile in an apache module

[George Moschovitis]

Hello everybody!

I am trying to code an apache2.0 module that uses guile for scripting
dynamic html pages. My problem is that i have to enclose the main loop
of the application in the scm_boot function for the gc to work according
to the manuals. 

When writing an apache module I do not have control over the main loop,
the http server just calls the handler method. Is there a way to
overcome this problem? Has anyone tried something similar (mod_guile
perhaps?)

Any info will be appreciated!


regards,
George Moschovitis

--
Navel



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Re: integrating guile in an apache module

[rm]

On Tue, Jul 29, 2003 at 01:44:28PM +0300, George Moschovitis wrote:
> Hello everybody!
> 
> I am trying to code an apache2.0 module that uses guile for scripting
> dynamic html pages. My problem is that i have to enclose the main loop
> of the application in the scm_boot function for the gc to work according
> to the manuals. 

What version of Guile do you intent to use? Recent version do not
need to wrap the application's 'main()' function (using other means
to detect the bottom of the stack) -- have a look at the documentation
for scm_init_guile() vs. scm_boot_guile().

> When writing an apache module I do not have control over the main loop,
> the http server just calls the handler method. Is there a way to
> overcome this problem? Has anyone tried something similar (mod_guile
> perhaps?)

Well, with Apache2 you might encounter other, more severe, problems as
well. Apache2 might run in multithreaded manner and hence there's a 
high chance for several modules to execute in parallel. AFAIK guile
is'nt meant to be run in parallel (only one thread can use guile).

> Any info will be appreciated!

Hope that helps. BTW, are your trying to write an Apache2 mod_guile?


 Ralf Mattes
> 
> 
> regards,
> George Moschovitis
> 
> --
> Navel
> 
> 
> 
> _______________________________________________
> Guile-user mailing list
> Guile-user@gnu.org
> http://mail.gnu.org/mailman/listinfo/guile-user


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Re: integrating guile in an apache module

[Dale P. Smith]

George Moschovitis wrote:
> Hello everybody!
> 
> I am trying to code an apache2.0 module that uses guile for scripting
> dynamic html pages. My problem is that i have to enclose the main loop
> of the application in the scm_boot function for the gc to work according
> to the manuals. 
> 
> When writing an apache module I do not have control over the main loop,
> the http server just calls the handler method. Is there a way to
> overcome this problem? Has anyone tried something similar (mod_guile
> perhaps?)
> 
> Any info will be appreciated!

Have a look at http://savannah.nongnu.org/projects/mod-guile

-Dale

-- 
Dale P. Smith
dsmith at actron dot com



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Re: integrating guile in an apache module

[Sergey Dolin]

r> Well, with Apache2 you might encounter other, more severe, problems as
r> well. Apache2 might run in multithreaded manner and hence there's a 
r> high chance for several modules to execute in parallel. AFAIK guile
r> is'nt meant to be run in parallel (only one thread can use guile).

 It's worth to look on guile-fcgi.

http://isc.uu.ru/~dsa/guile

-- 
Sergey                                 30 July, Wednesday 09:20(YEKST +0600)
Gnus v5.9(GNU/Emacs 21.2)*Debian GNU/Linux woody*Fvwm-2.4


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Re: integrating guile in an apache module

[tomas]

On Wed, Jul 30, 2003 at 09:21:43AM +0600, Sergey Dolin wrote:
> 
> r> Well, with Apache2 you might encounter other, more severe, problems as
> r> well. Apache2 might run in multithreaded manner and hence there's a 
> r> high chance for several modules to execute in parallel. AFAIK guile
> r> is'nt meant to be run in parallel (only one thread can use guile).
> 
>  It's worth to look on guile-fcgi.
> 
> http://isc.uu.ru/~dsa/guile

While putting things into separate processes has definitely
its advantages, it still strikes me that Guile kicks and
bites so much when one tries to embed it into an application
(since it was born with embedding as an explicit goal).

Hmmm.

Sorry for rambling

-- tomas


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Re: integrating guile in an apache module

[Per Bothner]

rm@fabula.de wrote:
> On Tue, Jul 29, 2003 at 01:44:28PM +0300, George Moschovitis wrote:
> 
>>Hello everybody!
>>
>>I am trying to code an apache2.0 module that uses guile for scripting
>>dynamic html pages.
> 
> Well, with Apache2 you might encounter other, more severe, problems as
> well. Apache2 might run in multithreaded manner and hence there's a 
> high chance for several modules to execute in parallel. AFAIK guile
> is'nt meant to be run in parallel (only one thread can use guile).

You might consider using Kawa for scripting dynamic html web pages in
Scheme.  Kawa supports compiling a Scheme program to a "servlet" which
can run quite efficiently in a "servlet engine" such as Tomcat.  And
of course servlets are designed to be run using multiple threads.

This article show how simple it can be:
http://www.gnu.org/software/qexo/simple-xquery-webapp.html
The article uses the XQuery language, but using Scheme should
also work in the same way (though I haven't tried writing a
Scheme version of the example).  (To avoid mis-understandings:
Kawa is now a multi-language framework, providing implementations
of Scheme, Emacs Lisp, XQuery, and other languages.)

You might also consider BRL: http://brl.sourceforge.net/
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/




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