[Stackless] Fwd: deepcopying (pickling) channels
lars van Gemerden
lars at rational-it.com
Sun Oct 6 08:58:20 CEST 2013
maybe double but i got a mail bounce ..
---------- Forwarded message ----------
From: lars van Gemerden <lars at rational-it.com>
Date: Thu, Oct 3, 2013 at 6:15 PM
Subject: Re: [Stackless] deepcopying (pickling) channels
To: The Stackless Python Mailing List <stackless at stackless.com>
actually both give an error. The only thing different is the error message.
with pickle the code would be:
---------------------------------------------------------------------------
import stackless, pickle
class Test(object):
def __init__(self):
self.channel = stackless.channel()
def run(self):
stackless.tasklet(self.sender)()
stackless.tasklet(self.receiver)()
stackless.run()
def sender(self):
counter = 0
while counter < 10:
self.channel.send(counter)
counter += 1
def receiver(self):
counter = 0
while counter < 12:
counter = self.channel.receive()
print counter,
print "done"
if __name__ == "__main__":
t = Test()
t.run()
t.channel = None
s = pickle.dumps(t) #OK
t = Test()
t.run()
s = pickle.dumps(t) #ERROR
-----------------------------------------------------------------------------
and the error:
pickle.PicklingError: Can't pickle <type 'function'>: it's not found as
__builtin__.function
otherwise the error behavior is the same as decribed above.
Cheers, Lars
(as far as i have read and tested a bit, deepcopy allows more to be copied
then pickle, but cPickle is faster, so i have my own deepcopy:
def deepcopy(obj):
try:
return cPickle.loads(cPickle.dumps(obj, -1))
except PicklingError:
return copy.deepcopy(obj)
)
On Thu, Oct 3, 2013 at 5:19 AM, Richard Tew <richard.m.tew at gmail.com> wrote:
> I'm a little confused. Are you pickling the tasklets, or copying
> them? These are different things to Python.
>
> As far as I know using copy or deepcopy has never been supported for
> tasklets and therefore channels.
>
> Pickling however, is another matter.
>
> Cheers,
> Richard.
>
> _______________________________________________
> Stackless mailing list
> Stackless at stackless.com
> http://www.stackless.com/mailman/listinfo/stackless
>
--
====================================
Lars van Gemerden
lars at rational-it.com
+31 6 26 88 55 39
====================================
--
====================================
Lars van Gemerden
lars at rational-it.com
+31 6 26 88 55 39
====================================
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