[Tutor] signals and frame objects

[Marilyn Davis]

Oh wow.  That is so easy.  I thought I had to manipulate the frame
object somehow to get back to where I was.  Thank you so much Kent.

Marilyn

On Wed, 15 Sep 2004, Kent Johnson wrote:

> If you return from the handler, processing will continue where it was 
> interrupted. If you want to inspect the frame object in your handler, some 
> information about it is available here:
> http://docs.python.org/ref/types.html#l2h-142
> 
> For example, running this program in IDLE on MacOSX:
> #############################
> import signal
> 
> done = 0
> def handler(signum, frame):
>      print frame
>      print dir(frame)
>      print 'Signal handler called with signal', signum
>      global done
>      done = 1
> 
> # Set the signal handler and an alarm
> signal.signal(signal.SIGALRM, handler)
> signal.alarm(3)
> 
> print "Looping"
> while not done:
>      pass
> 
> print "Out of loop"
> 
> signal.alarm(0)          # Disable the alarm
> 
> print "Done"
> ##############################3
> 
> gives this output:
>  >>> ================================ RESTART ================================
>  >>>
> Looping
> <frame object at 0x4fd6c0>
> ['__class__', '__delattr__', '__doc__', '__getattribute__', '__hash__', 
> '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', 
> '__setattr__', '__str__', 'f_back', 'f_builtins', 'f_code', 
> 'f_exc_traceback', 'f_exc_type', 'f_exc_value', 'f_globals', 'f_lasti', 
> 'f_lineno', 'f_locals', 'f_restricted', 'f_trace']
> Signal handler called with signal 14
> Out of loop
> Done
>  >>>
> 
> Kent
> 
> 
> At 09:23 AM 9/15/2004 -0700, Marilyn Davis wrote:
> >Hello Tutors,
> >
> >I'm setting a signal.alarm() and I am successful in catching it in my
> >handler function.  The parameters given to me in my handler include
> >the stack frame.  Is there some way I can use that stack frame to
> >continue processing?
> >
> >Thank you for any help anyone can give.
> >
> >Marilyn Davis
> >
> >--
> >
> >_______________________________________________
> >Tutor maillist  -  Tutor at python.org
> >http://mail.python.org/mailman/listinfo/tutor
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
> 

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