[IronPython] Is it possible to set a maximum loop size for scripts?

Michael Foord fuzzyman at voidspace.org.uk
Sat Apr 18 14:40:28 CEST 2009

Alex News wrote:
> In the general case this isn't possible:
> http://en.wikipedia.org/wiki/Halting_problem

Well it's not strictly a halting problem. The question isn't whether it 
will  *ever* terminate but just is it taking too long.

IronPython doesn't include this functionality built in but it would be 
*possible* (theoretically) to count loops. I don't think it is a very 
useful approach though - a very tight loop can execute thousands of 
times in a second.

> Perhaps some sort of timeout logic would work for you?  I.e. kill the
> script if it is still running after some predetermined amount of time.
>  I do not know if IronPython has any such functionality built in, but
> it should be easy enough to roll your own.

I agree - spin the code up in its own thread and kill it if it doesn't 
end within a preset maximum time.

> On 4/18/09, theoobe <omgomgomg at f2s.com> wrote:
>>  I have a C# application with IronPython scripting.  I wonder, is it possible
>>  to prevent users from creating infinite loops in their scripts?
>>  So for example, if a script is executed which contains a loop, and loop is
>>  infinate, would it be possible for my C# application to detect this, perhaps
>>  by having a maximum loop cycle count?  Thus preventing my application from
>>  hanging...
>>  I've tried googling around on this subject but I've had no joy.  Maybe what
>>  I'm asking for isn't possible?
>>  Thanks alot!
>> --
>>  View this message in context: http://www.nabble.com/Is-it-possible-to-set-a-maximum-loop-size-for-scripts--tp23084739p23084739.html
>>  Sent from the IronPython mailing list archive at Nabble.com.
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