My PyLucene app freezes when run as a daemon

Fri Mar 23 22:12:00 GMT 2007

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
>