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Hi,

I just have a design problem and don't know how to solve it. I call a
function which
executes a simple "PyRun_String(...)" command.

imagine the script while 1: pass is executed so the app would hang. Is
there any chance
to break out this PyRun_String-function? I just searched the forums
for that stuff
but these information are very rare.

Thanks for any suggestions.

Bye.

>>>>> (g) wrote:

>g> Hi,
>g> I just have a design problem and don't know how to solve it. I call a
>g> function which
>g> executes a simple "PyRun_String(...)" command.

>g> imagine the script while 1: pass is executed so the app would hang. Is
>g> there any chance
>g> to break out this PyRun_String-function? I just searched the forums
>g> for that stuff
>g> but these information are very rare.

>g> Thanks for any suggestions.

I think PyRun_String is similar to exec. If you are on a Unix system you
can use the alarm signal. Here is a pure Python example, but I suspect
you can translate this to C in a straightforward manner.

import signal

class AlarmError(Exception):
pass

def handler(signum, frame):
raise AlarmError, "command lasts too long"

signal.signal(signal.SIGALRM, handler)

def execute(command, timeout):
signal.alarm(timeout);
try:
exec(command)
except AlarmError, e:
print e
print 'Aborted "%s"' % (command,)
print "continue work"

print "The everlasting command"
execute("while 1: pass", 10)
print "The End"


--
Piet van Oostrum <>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email:

hi, yes, thats true, Alan Touring told us, so it would be nice to let
the user abort it.

Is there a chance for windows, too?

>>>>> (g1w) wrote:

>g1w> hi, yes, thats true, Alan Touring told us, so it would be nice to let
>g1w> the user abort it.

>g1w> Is there a chance for windows, too?

I don't know. I have no access to Python on Windows. Maybe there is
setitimer support on Windows. Or maybe you can use the threading.Timer
object, like this:

import signal, os
import threading

signalcode = signal.SIGALRM # on Windows, choose one that exists there.

class AlarmError(Exception):
pass

def interrupt():
os.kill(os.getpid(), signalcode)

def execute(command, timeout):
threading.Timer(timeout, interrupt).start()
try:
exec(command)
except AlarmError, e:
print e
print 'Aborted "%s"' % (command,)
print "continue work"

print "The everlasting command"
execute("while 1: pass", 10)
print "The End"

--
Piet van Oostrum <>
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email:

On 16 Apr., 11:08, Piet van Oostrum <p...@cs.uu.nl> wrote:
> >>>>> googler.1.webmas...@spamgourmet.com (g1w) wrote:
> >g1w> hi, yes, thats true, Alan Touring told us, so it would be nice to let
> >g1w> the user abort it.
> >g1w> Is there a chance for windows, too?
>
> I don't know. I have no access to Python on Windows. Maybe there is
> setitimer support on Windows. Or maybe you can use the threading.Timer
> object, like this:
>
> import signal, os
> import threading
>
> signalcode = signal.SIGALRM # on Windows, choose one that exists there.
>
> class AlarmError(Exception):
> * * pass
>
> def interrupt():
> * * os.kill(os.getpid(), signalcode)
>
> def execute(command, timeout):
> * * threading.Timer(timeout, interrupt).start()
> * * try:
> * * * * exec(command)
> * * except AlarmError, e:
> * * * * print e
> * * * * print 'Aborted "%s"' % (command,)
> * * print "continue work"
>
> print "The everlasting command"
> execute("while 1: pass", 10)
> print "The End"
>
> --
> Piet van Oostrum <p...@cs.uu.nl>
> URL:http://pietvanoostrum.com[PGP 8DAE142BE17999C4]
> Private email: p...@vanoostrum.org

thx, i will check... merci