[Zope] Auto restart (at Zope's own initiative !!!)

[Brian Lloyd]

> Actually, I posted the dll and 3 test scripts (the two here, plus one
> non-threaded) to the sourceforge site, hoping for either a clue or a
> bugfix.
> 
> I think I did use the extending/embedding doc you sited, along with the
> O'Reilly books, when I was teaching myself to write extensions.  I don't
> recall anything much related to threading, except
> Py_BEGIN/END_ALLOW_THREADS, which I think just deals with blocking,
> which I suspect is a different (and irrelevent?) issue here.

Thread blocking _is_ relevant if the .dll you are calling is 
not reentrant. You really need to refer to the documented 
thread behavior / requirements of the dll you are trying to 
interface to - there is no magic right answer on the Python 
end. What you need to do in your C extension depends totally 
on the internals of the dll you are calling.

While it may be worth a shot to post your problem to comp.lang.python 
to try to get help from other C extension writers, they will 
probably not be able to help much either without knowing more about 
the threading constraints of the particular dll you are working 
with. Your best bet right now is to contact the maintainers of 
that dll (or read their developer docs) and find out what kinds 
of threading issues apply.


Brian Lloyd        brian@zope.com
Software Engineer  540.361.1716       
Zope Corporation   http://www.zope.com