Hi Anselm,
thank you very much for the hint!
I think for the use case it will be sufficient, since there is no real
fork() necessary (but I need to look deeper).
Victor uses fork() to run a function call in a subprocess, so this
is not exposed to the user as a general purpose fork, but just a helper
to make a call in the same context. (I hope)
And if that is true, then I can fake everything well enough, even in a
nested
interpreter context (I think), if just the one call needs to work.
After the call, the subprocess will kill itself... ;-)
I will grab the checkpoint code, now.
Probable this is more like a "chip fork" (was heisst Gaebelchen?)
forklet :-D
thanks a lot - Chris
On 24.10.13 21:50, Anselm Kruis wrote:
Hi Christian,
I have no experience with pysandbox and I'm not very confident, that
it is possible at all to lock down a python installation completely.
But for your question: you can simulate something like POSIX fork()
using Stackless Python and sPickle. But there are limitations:
- you must not have C-state on the stack
- the child process does not inherit IO resources like open files,
sockets, ...
- the performance is low compared with a real fork.
- you can't fork the main tasklet
The examples folder of sPickle contains a checkpointing example, that
could serve as a starting point.
Cheers
Anselm
Am 24.10.2013 21:15, schrieb Christian Tismer:
Hi Kristjan, Anselm et al.,
just had a look into stacklesslib, searching a fork() function.
Maybe sPickle is the way to go? Looking there as well right now.
Reason:
I am evaluating pysandbox from Victor Stinner which is quite functional,
but missing some spots on windows.
Unfortunately, although it uses subprocess, in a call() with subprocess
it uses fork() :-(
And as always, I need that stuff on windows, sooo,
why not emulating fork, instead of re-writing things.
And btw., do you have experience with pysandbox, or should I use
something else for semi-protected code?
cheers & thanks - chris
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