[Python-Dev] Re: Integrating timeoutsocket.py

[Guido van Rossum]

> >   Found the cause in ServerSocket.py. You need to add the line:
> > 
> >     t.setDaemon (1)
> > 
> >   at line 469 in ServerSocket.py, right after the thread is
> > created. Whether this is an error is debatable though.
> 
> Since this is a semantics change, you need to make this operation
> optional - either by passing parameters, or by checking state of some
> object.

One option would be to insert a call to a hook method at that point.
Define the hook to do nothing in the base class.  Theyn your own class
can override the hook to call t.setDaemon(1).  The hook should
probably be called with the thread object (t) as its argument.

> If you think the setDaemon call should be the default, you can then
> deprecate the case where the application does not explicitly specify
> the daemon behaviour (with a deprecation warning (*)), but continue to
> operate in this case as today - in a future version of Python (say,
> 2.5), the default can then be changed.
> 
> Want to work on a patch?
> 
> Regards,
> Martin
> 
> (*) Triggering the deprecation warning just often enough is tricky. In
> this case, I would trigger it once per implementation class.

The default hook could include a call to warnings.warn().  This would
only trigger once per program, but I bet that's a good approximation
of once per implementation class. :-)

--Guido van Rossum (home page: http://www.python.org/~guido/)