RE: My PyLucene app freezes when run as a daemon

["Ofer Nave" <ofer at smarter dot com>]

Sorry, I should stated this explicitly:

I am running on linux 2.6.9.

-ofer 

> -----Original Message-----
> From: java-owner@gcc.gnu.org [mailto:java-owner@gcc.gnu.org] 
> On Behalf Of Ofer Nave
> Sent: Friday, March 23, 2007 2:24 PM
> To: java@gcc.gnu.org
> Subject: My PyLucene app freezes when run as a daemon
> 
> This might be a bit off the usual topic range here, but I was 
> pointed to this list.
> 
> Background:
> 
> PyLucene is a GCJ-compiled version of Java Lucene integrated 
> with Python.
> http://pylucene.osafoundation.org/
> 
> Context:
> 
> I have a PyLucene searcher application running under a 
> multithreaded python web server called Paste 
> (http://pythonpaste.org).  I've added a command-line argument 
> to my script to run the script as a daemon based on the code 
> in this article: 
> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731
> 
> Problem:
> 
> When the script is run as a normal process, it works fine.  
> When it is run as a daemon, it freezes after about a dozen 
> requests.  The point it's freezing at is in a call to a class 
> that is known to not be thread-safe, so that might be the 
> problem - but on the other hand, the only difference between 
> the good and bad scenarios is whether it's running as a 
> daemon, so I tend to lean towards that as my top clue.
> 
> How I Got Here:
> 
> I posted this to the PyLucene list, and was told: "You might 
> want to ask java@gcc.gnu.org about daemonizing a process 
> using libgcj and boehm-gc."  So I'm giving it a shot.  Does 
> anyone have wisdom on the care and feeding of daemonized 
> processes built with GCJ?  Is there anything special I need 
> to know about?
> 
> Appendix 1 - My daemonize() Function:
> 
> # call to detach yourself from a terminal def daemonize(logfile=None):
>     # fork twice to sever any ties
>     _fork()
>     os.setsid()
>     _fork()
>     os.chdir(WORKDIR)
>     os.umask(UMASK)
> 
>     # close standard I/O channels
>     os.close(0)  # stdin
>     os.close(1)  # stdout
>     os.close(2)  # stderr
> 
>     # redirect standard output channels to logfile
>     if logfile:
>         sys.stdout = sys.stderr = logfile
> 
>     # set up SIGTERM handler for cleanup
>     signal(SIGTERM, _sigterm_handler)
> 
> -ofer
>