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mod_fcgid - process ending

 
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soubok



Joined: 14 Aug 2007
Posts: 5
Location: France

PostPosted: Tue 14 Aug '07 16:02    Post subject: mod_fcgid - process ending Reply with quote

Hello,

I am creating a JavaScript based FastCGI module (http://code.google.com/p/jslibs/wiki/jsfastcgi) and I noticed that when mod_fcgid is shutting down my FastCGI process ( because MaxRequestsPerProcess or ProcessLifeTime, or ... ) my ReleaseData function is never called.

InitData();
while ( Accept() >= 0 ) {
...
}
ReleaseData();

It there a way to tell mod_fcgid to generate an 'error' to make Accept return instead of killing the FastCGI process ?

or do I miss something ?

Thanks,

Franck.


PS: WinXP SP2, Apache 2.2.4, mod_fcgid-2.2-w32, lib fcgi-2.4.0
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tdonovan
Moderator


Joined: 17 Dec 2005
Posts: 610
Location: Milford, MA, USA

PostPosted: Wed 15 Aug '07 16:00    Post subject: Reply with quote

If you are using the FastCGI Developer's Kit, perhaps you mean:
Code:
while ( FCGI_Accept() >= 0 ) {
instead of
Code:
while ( Accept() >= 0 ) {


FCGI_Accept() is defined in fcgi_stdio.h.

-tom-
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soubok



Joined: 14 Aug 2007
Posts: 5
Location: France

PostPosted: Wed 15 Aug '07 16:14    Post subject: Reply with quote

Yes, I am using FastCGI Developer's Kit and Accept() is a wrapper to FCGX_Accept()
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tdonovan
Moderator


Joined: 17 Dec 2005
Posts: 610
Location: Milford, MA, USA

PostPosted: Wed 15 Aug '07 18:41    Post subject: Reply with quote

You're right, FCGI_Accept (or Accept) never returns when the process ends.
It looks like it is just an undesirable characteristic of FastCGI on Windows which uses named pipes.

If you look at the FastCGI source (search for ShutdownRequestThread),
when the connection is a Windows named pipe (listenType == FD_PIPE_SYNC), the process just dies.

-tom-
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soubok



Joined: 14 Aug 2007
Posts: 5
Location: France

PostPosted: Thu 16 Aug '07 11:10    Post subject: Reply with quote

This behavior is really annoying for me Sad
I tried to use atexit(&FCGX_Finish); without success.

Do yo know a workaround to make FCGX_Accept to return with an ""error"" when the process has to exit ?

Franck.
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Steffen
Moderator


Joined: 15 Oct 2005
Posts: 2600
Location: Hilversum, NL, EU

PostPosted: Thu 16 Aug '07 20:43    Post subject: Reply with quote

I contacted the author. When he answers I come back here.


Steffen
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Steffen
Moderator


Joined: 15 Oct 2005
Posts: 2600
Location: Hilversum, NL, EU

PostPosted: Fri 17 Aug '07 19:28    Post subject: Reply with quote

This I received:

Ryan wrote:
It's very ugly to "make" accept() return, this issue should be solved on the javascript side? Does he try _onexit() on Win32?
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soubok



Joined: 14 Aug 2007
Posts: 5
Location: France

PostPosted: Fri 17 Aug '07 19:42    Post subject: Reply with quote

Thanks a lot Steffen for retransmitting Smile
It seems correct that after a "accept() return" the program MUST end.
The drawback of onexit is that it breaks the flow of the interpreted JS code and it is dangerous to call another code while the first has not ended.
I think that it is legitimate to make some cleanup tasks ( remove temp files, close DB connections, ...) after Accept() even if it is scripted.

Franck.
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soubok



Joined: 14 Aug 2007
Posts: 5
Location: France

PostPosted: Mon 27 Aug '07 14:08    Post subject: Reply with quote

Any news ?
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tdonovan
Moderator


Joined: 17 Dec 2005
Posts: 610
Location: Milford, MA, USA

PostPosted: Mon 27 Aug '07 19:42    Post subject: Reply with quote

I suspect that Ryan is a mod_fcgid developer (although I'm not sure).
mod_fcgid just runs the already-linked executable.

The problem seems to be in the FastCGI C Development Kit which provides the libfcgi.dll library.
I doubt that the mod_fcgid people can fix that.

Maybe you should post something to the fastcgi-developers list about the poor Windows shutdown handling in os_win32.c?

-tom-
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