On Feb 1, 1:02 am, Graham Dumpleton <[email protected]>
wrote:
> On 1 February 2010 16:55, Chris Curvey <[email protected]> wrote:
[snip]
>
> > import os
> > import sys
> > sys.path.append("c:/foobar")
> > sys.path.append("c:/foobar/foobar_service")
> > sys.path.append("c:/python26/lib/site-packages/xlrd-0.7.1-py2.6-
> > win32.egg")
>
> If that package was installed correctly in the first place, there
> shouldn't be a need to be adding that path explicitly like you are.
> This is because the site-packages directory should already be in your
> path and by that being so, the .pth in that directory which refers to
> the actual egg directory should have been read and the egg directory
> also automatically added to sys.path without you doing anything. This
> is not relevant to the problem though.
I agree. I'm sure I had a good reason for doing this when I did it,
but the reason itself escapes me now. I will dig into it later.
[snip]
>
> All I can suggest is that your application is using a C extension
> module for Python and that modules implementation is not thread safe.
> Such problems in pure Python modules will not cause a crash, but for C
> extension modules you can get a crash like you see.
>
> What Python modules are you using that you installed yourself and
> which have a C extension module component?
Aaaah, excellent insight. I have both the MySQLdb and pyodbc drivers
installed -- those are both C extensions. And I have a feeling (but I
can't prove it yet) that the problem is in my implementation of a
connection pool for the pyodbc driver.
Now, if I can't find the problem in my python code, would a fallback
workaround be to build an Apache server for Windows with the "worker"
MPM, since that uses processes (rather than threads) to isolate
requests?
Update from while I'm typing this: I'm now getting some crashes when
running the server with the built-in Django webserver, rather than
with Apache + mod_wsgi. This seems to be happening when there is any
unhandled exception somewhere in the code.
>
> Graham
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