> Oliver Bock <[EMAIL PROTECTED]> writes:
>>
>> I've implemented the infinite loop-catching suggestion by instrumenting
>> the Python code. I haven't adopted the techniques from the article Ian
>> found because I'm lazy, and because my users are silly, not evil. It
>> took a bit of buggering abo
>> Why not parse the python code fragments before executing them and insert a
>> check for a stop event in the beginning of each loop. It could even force a
>> loop counter of some type that would allow the main thread to force the
>> worker thread to stop processing through a stop event once a th
-
Oliver Bock <[EMAIL PROTECTED]> writes:
>
> I've implemented the infinite loop-catching suggestion by instrumenting
> the Python code. I haven't adopted the techniques from the article Ian
> found because I'm lazy, and because my users are silly, not evil. It
> took a bit of buggering a
I've implemented the infinite loop-catching suggestion by instrumenting
the Python code. I haven't adopted the techniques from the article Ian
found because I'm lazy, and because my users are silly, not evil. It
took a bit of buggering about but the result is fairly simple. Read on
if you're
Ian Bicking <[EMAIL PROTECTED]> writes:
> This recipe might be of use:
> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/496746
>
> I don't believe it is threadsafe, but I'm not sure. I think it needs to
> run the code in the main thread, then puts an alarm in a subthread that
> interr
Wheeler, Richard wrote:
> Why not parse the python code fragments before executing them and insert a
> check for a stop event in the beginning of each loop. It could even force a
> loop counter of some type that would allow the main thread to force the
> worker thread to stop processing through a
This is a good idea, but a lot of work. (It messes with my head
whenever I get into the parse tree stuff.)
Oliver
--
Wheeler, Richard wrote:
> Why not parse the python code fragments before executing them and insert a
> check for a stop event in the beginning of each loop. It could even fo
On Wed, 21 Jun 2006 15:01:03 -0400< "Wheeler, Richard"
<[EMAIL PROTECTED]> wrote:
>Why not parse the python code fragments before executing them and insert a
>check for a stop event in the beginning of each loop. It could even force a
>loop counter of some type that would allow the main thread to
been reached.
-Original Message-
> [Webware-discuss] Dead threads: detection and recovery Oliver Bock
> Mon, 19 Jun 2006 00:50:23 -0700
>
> My system allows users to write their own python code fragments for
> some tasks. Unfortunately the users sometimes write infinite
Ian Bicking wrote:
> It's been a while since I've been in that code (ThreadedAppServer) but
> no, I don't believe there's a way to detect wedged threads. That would
> be a nice feature.
How about this plan: as each thread starts a request we record the time
processing begins in the thread objec
Oliver Bock wrote:
> My system allows users to write their own python code fragments for some
> tasks. Unfortunately the users sometimes write infinite loops, which
> gradually lock up threads until none remain. A few minutes later a
> monitor notices that the system is unresponsive and kills
Shayne O'Neill wrote:
> Does python have a sort of cooperative "pass" command? Whilst little
> (other than an external monitoring process, assuming the monitor gets a
> chance to do its thing) will stop someone writing this code;-
>
> while 1==1:
> echo "hi mum"
>
> a call like
>
> whi
Ben Parker wrote:
> ... If management is
> pushing for those kinds of development capabilities in order to drive
> their business, you should push back that their requirements demand more
> knowledgeable staff.
>
While I agree with your suggestions, they unfortunately won't fly.
Oliver
Oliver Bock wrote on 06/19/2006 05:45 PM:
> I think I should explain the system: the software allows the design and
> execution of web surveys. The people writing code are constructing
> surveys and sometimes need to write Python fragments to decide (for
> example) which question is shown next.
Does python have a sort of cooperative "pass" command? Whilst little
(other than an external monitoring process, assuming the monitor gets a
chance to do its thing) will stop someone writing this code;-
while 1==1:
echo "hi mum"
a call like
while 1==1:
one_of_our_calls()
I completely take your point that you cannot stop malicious users
abusing scripting facilities. (Although if it weren't for the import
statement, I think you could provide a limited set of functions in
__globals__ and limit the abuse to overuse of the CPU.)
I think I should explain the system:
Or to clarify I mean you cant offer scripting to users, and make it so it
cant be abused. One of my old projects was to embed python in the citadel
groupware server [fun fact, I got webware working from inside the citadel
server] and yeah, couldnt make it secure at all, so ended up with signed
Hmm. Ok. What Im getting at, is that Im presuming that these scripts are
at an administrative level? Python absolutely can not be made secure.
There where attempts a while back at it, but it was found that it simply
cant be done.
Oh yeah, totally offtopic, but regarding the 'penis enhancing dr
>
> Without wanting to be rude, but is there a point to the exercise?
Of course not. I've got nothing better to do than start mailing list
threads. On my weekends I go around and post comments to blogs,
advertising penis-enlarging drugs.
> ... If this
> is a problem then one would presume th
Without wanting to be rude, but is there a point to the exercise? If this
is a problem then one would presume that they can just restart the system
if it locks and check out the stack dump?
On Mon, 19 Jun 2006, Oliver Bock wrote:
> My system allows users to write their own python code fragments
My system allows users to write their own python code fragments for some
tasks. Unfortunately the users sometimes write infinite loops, which
gradually lock up threads until none remain. A few minutes later a
monitor notices that the system is unresponsive and kills and restarts
AppServer. T
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