[Stackless] tracing stackless events

[Andrew Dalke]

On Dec 21, 2007, at 1:50 AM, Christian Tismer wrote:
>>   - the code for calling the channel callback silently swallows  
>> any exceptions raised during the callback.  It should at least  
>> dump the traceback to stderr.
>
> Well, this was designed for debugging the application, not buggy
> debugging code. But well, could be done.

Quis debugiet ipsos debuges? (Completely fake latin transleration;
   whats "debug" in Latin?)

Sometimes the debugger needs debugging.

>>   - I would like to assign a name and perhaps a group name or  
>> other properties to the tasklet and channel.  That makes it easier  
>> to debug.  But they are C types and I can't.  I had to use a weak  
>> dictionary instead.
>
> I agree that this is hard for the main tasklet, which will be your
> own creation in another future release.
> But then, why are you not using inheritance, this is exactly what
> it is meant for.

Yes, that works.  I was thinking about what to do if I don't have  
control of the library which makes the tasklet.  I was also thinking  
of the related 'threading' API which has

   __init__(self, group=None, target=None, name=None,
            args=(), kwargs=None, verbose=None)

Mapping that to a Stackless call is

    tasklet(target)(*args, **kwargs)

(Interesting.  The Python docs don't mention the 'verbose' flag.)   
What's left out is 'name' and 'group'.  But 'group' is meant for  
thread groups.  Didn't know that either.

Anyway, I was also trying to come up with a reason for why having a  
tasklet name is useful.  I think it's only for debugging.


				Andrew
				dalke at dalkescientific.com