[IPython-dev] Re: [SciPy-dev] Generic gui_thread + IPython: solution already exists!
Fernando.Perez at colorado.edu
Sun Nov 14 21:32:43 EST 2004
Prabhu Ramachandran wrote:
> The approach Fernando uses is identical to what is done in the
> gpython.py shell used to run pyGTK interactively. A wxApp or
> gtk.mainloop() is run in a background thread and *everything* typed by
> the user is run in it. IPython grabs whatever the user types and then
> sends this off to the second thread and executes it there. Thus,
> things are always done in the right thread and there are no issues.
> The only problem is exceptions, signal handlers etc. It looks like
> exceptions are trapped nicely and passed back to the main thread. I
> don't know about the signal handlers.
Signal handling is a mess. The thread you referred to originally mentions
this. My brute-force approach was to install a sigint handler _every_ time I
enter the 2nd thread, right before executing user code. Somehow this seems to
allow me to trap SIGINT correctly, which I otherwise could never catch (and it
would blow things up badly).
From what others on c.l.py said, this is not an easy problem, but if anyone
knows of a cleaner solution than what I came up with (an admittedly gross
hack), I'm all ears.
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