[Zope] - Httpdapy and Zope problems

[Andreas Kostyrka]

On Sun, 13 Dec 1998, Paul Everitt wrote:

> Presumably on Linux, right?  Want to share the details of your kernel
> versions, etc. and any lessons you learned along the way?
Developed on a RH5.1 (in reality a RH5.x with x some float between 1 and
2, I'm usually upgrading systems partially without disturbing the uptime
:) )

Deployed on a Suse 5.3 with a statically compiled python (the python was
compiled statically on a RH5.x box).

Lessons:
-) Python 1.5.1 seems to report exceptions in threads via C language
   mechanism (at least the first line, ``Unexpected exception ...''.
   So I'm using the following SaveThread class:
class SaveThread(threading.Thread):
    savethread=1

    def run(self):
        try:
            threading.Thread.run(self)
        except SystemExit:
            raise
        except:
            import CGIResponse
            r=CGIResponse.Response()
            exp=sys.exc_info()
            res=r.format_exception(exp[0],exp[1],exp[2])

logger("loggerSupport>SaveThread/run:exception",string.joinfields(re
s,"\n"))

-) Mixing lowlevel threads and hilevel threads (threading module) 
   works, but generates many Dummy Thread objects that cannot do a thing
   :(
   So probably stick with one of these two :)

-) There are a number of cool things that one can do once one started to
   use threads, like DebuggingServer (more or less a Python shell that
   is executed inside the LRP), ...

-) One thing to look out is, that on Linux/glibc2 each pthread seems to
   use up one file descriptor. (Not so cool in my application that soaks
   up filedescriptors quite fast :( )

One a side note, fork() and sys.exit() do not coexist peacefully it seems
with pcgi, while fork() and exec() do so. I guess pcgi is overwriting
sys.exit and shutdowns the LRP when one of the childs calls sys.exit :(

Andreas
-- 
Win95: n., A huge annoying boot virus that causes random spontaneous system
     crashes, usually just before saving a massive project.  Easily cured by
     UNIX.  See also MS-DOS, IBM-DOS, DR-DOS, Win 3.x, Win98.