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Sandboxing [Was Re: killing thread ?]

Jp Calderone exarkun at intarweb.us
Fri Jan 24 22:38:36 EST 2003 
On Fri, Jan 24, 2003 at 10:11:08PM -0500, Terry Reedy wrote:
> 
> "Paul Rubin" <phr-n2003b at NOSPAMnightsong.com> wrote in message
> news:7xn0lq3v0b.fsf at ruckus.brouhaha.com...
> > Recursion depth is already limited.
> 
> I was thinking of something more limited, like
> sys.setrecursionlimit(10), instead of the current default of 1000 (on
> my box).
> 

import time
start = time.time()
try:
    (lambda x: x(x))(lambda x: x(x))
except RuntimeError:
    print 'Took %0.2f seconds' % (time.time() - start)

import sys
sys.setrecursionlimit(10)
start = time.time()
try:
    (lambda x: x(x))(lambda x: x(x))
except RuntimeError:
    print 'Took %0.2f seconds' % (time.time() - start)
    

  On my machine, at least, the interval is so short that it is more or less
random which of the two blocks takes longer to execute, with times varying
from a hundredth of a second to four times that.  On hardware that hasn't
been obsolete since the last millenium, it's probably even less noticable.

  And who knows, your user might want to execute code for processing a
reasonably sized tree.  Are you really going to be so mean, and force them
to write an iterative version of the algorithm? :)

  Jp

-- 
"There is no reason for any individual to have a computer in their
home."
                -- Ken Olson, President of DEC, World Future Society
                   Convention, 1977
-- 
 up 40 days, 7:49, 7 users, load average: 0.55, 0.53, 0.50
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