Python 2.3.3 signals, threads & extensions: signal handling problem

[Holger Joukl]

Hi,
migrating from good old python 1.5.2 to python 2.3, I have a problem
running a program that features some threads which execute calls to
an extension module.
Problem is that all of a sudden, I cannot stop the program with a keyboard
interrupt any more; the installed signal handler does not seem to receive
the signal at all.
This happens both if I rebuild this extension using python 2.3
headers/library
and if I simply use the old extension (ignoring the API version warnings
:-)

Any hints?
Btw this is a sun sparc solaris 6 box, python 2.3.3.

G
Holger

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[fishboy]

Re: Python 2.3.3 signals, threads & extensions: signal handling problem

On Thu, 3 Jun 2004 14:48:05 +0200, "Holger Joukl"
<Holger.Joukl@L BBW.de> wrote:
[color=blue]
>Hi,
>migrating from good old python 1.5.2 to python 2.3, I have a problem
>running a program that features some threads which execute calls to
>an extension module.
>Problem is that all of a sudden, I cannot stop the program with a keyboard
>interrupt any more; the installed signal handler does not seem to receive
>the signal at all.
>This happens both if I rebuild this extension using python 2.3
>headers/library
>and if I simply use the old extension (ignoring the API version warnings
>:-)
>
>Any hints?
>Btw this is a sun sparc solaris 6 box, python 2.3.3.
>
>G
> Holger[/color]

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&q=threads+signals&meta=group%3Dcomp.lang.python.*

Looking at this search leads me to believe:

1. Threads + signals = bad

2. at some point things were changed to send all signals to the main
thread. (python)

Which leads me to believe that your signal handler is in a sub-thread?

hth,[color=blue]
><{{{*>[/color]

[Dieter Maurer]

Re: Python 2.3.3 signals, threads &amp; extensions: signal handling problem

"Holger Joukl" <Holger.Joukl@L BBW.de> writes on Thu, 3 Jun 2004 14:48:05 +0200:[color=blue]
> migrating from good old python 1.5.2 to python 2.3, I have a problem
> running a program that features some threads which execute calls to
> an extension module.
> Problem is that all of a sudden, I cannot stop the program with a keyboard
> interrupt any more; the installed signal handler does not seem to receive
> the signal at all.[/color]

python-Bugs-756924 may be related to your problem.

If so, you have a chance that the problem is fixed in Python 2.4.