Re: [PyX-user] Emacs, py-shell, and PyX results in a dead Python process

[Andre W. <wo...@us...>]

Hi Greg,

On 17.11.04, Greg Novak wrote:
> When I run python as an inferior process under Emacs and try to use
> PyX, I get a mysterious error:
> 
> import pyx
> g=pyx.graph.graphxy(width=8)
> g.plot(pyx.graph.data.list([[1,2],[2,4],[3,9]],x=1,y=2))
> g.writeEPSfile('gsn');
> 
> results in:
> 
> Process Python hangup

While I'm not using python-mode.el (indeed, I'm not using emacs at all
... I'm just to stupid to even quit this editor without the help of
the kill command -- others will tell that for vi(m), but let us not
stress this issue further), I have a wild guess. You're right, it
might be, that the process does not stop, since PyX did not yet quit
the underlaying TeX instance. It depends on whether you're using the
ipc-mode of PyX. Usually we have a _cleantmp call started via
atexit(), but this "terminate-all-signal" might not be issued in your
case. We also use setDaemon in the TeX observing thread to prevent
this thread from locking the finish of python, but still, in your
case, this might not be helpfull.

What you can do first, is to look for a still running tex process when
your example was run and than the process comes to a hang. If there is
such a process, just try to call text.reset() in the end. It will quit
the current TeX instance from the default texrunner. In case this
helps, you may switch to the none-ipc-mode of TeX, which needs to quit
TeX at those times, when the dvi file needs to be accessed. (While the
texrunner is able to start new TeX instances when needed, you should
not notice a functional difference between these two operating modes.
But it makes a difference in running time for certain operations,
where the access to the dvi data is needed intermediately.) You can
disable the ipc-mode in the pyxrc (either the systemwide pyxrc or the
users ~/.pyxrc). Or you strick on the explicit reset-call at the end
of your script (which is better, since you can still take advantage of
the ipc-functionality of TeX).

Still, I'm not sure whether this whole topic is related to your
problem, but its worth a try.


André

-- 
by  _ _      _    Dr. André Wobst
   / \ \    / )   wo...@us..., http://www.wobsta.de/
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