Re: Problems with multi-threaded FastCGI server

On Apr 18, 2006, at 15:20, Thierry Pierron wrote:

> First, I know that this has already been asked on this list, but I 
> wonder the lack of answer. The problem is simple : I can't make work 
> the multi-threaded example provided with libfcgi. I'm running fastcgi 
> with Apache 2.0.54 on Win32 with fcgi sdk that can be found here 
> http://www.fastcgi.com/dist/.
>
> As far as I've investigated, I got a timeout in the apache log, saying 
> that fastcgi server has not respond for 30 seconds. It seems that 
> whenever a thread leave the FCGX_Accept_r() function, the connection 
> is broken as soon as another thread enter it : I can see the content 
> of the first FCGX_FPrintF, just before the sleep(), and then I got the 
> classical apache Internal error message.
>
> If I protect the whole loop by a mutex, it works fine, though it's 
> like having mono-threaded application.
>
> I included the threaded.c example slighty modified to work with Win32 
> API. I wonder if anyone succeed to make it work as a FastCGI server...

Well, well, well, as a quick workaround, you can use socket-based 
communication instead of default pipe-based, by specifying -port option 
in httpd.conf when starting your fastcgi server. This works well,at 
least the multi-threaded example works as expected.

As far as I've investigated in the source of libfcgi, pipe-based 
communication does not work at all in a multi-threaded context, since a 
single handle seems to be used to communicate with server and 
deconnection is performed for each FCGX_Accept :-( Wonder why it is not 
more clearly stated in the doc ...
-- 
Thierry Pierron


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