[Tutor] About C++ library with multiprocessing

[Yohei Uemura]

Hi all,

I'm Yohei.
I have a problem with making a script which use both multiprocessing and
C++ library.
My C++ library is made by using boost python.
The library worked well if it was imported normally.
That is,
"import simple as F
A = range(0,100)
for x in A:
   print F.addition(x)
"
However, it couldn't work if it was called from multiprocessing.
That is,
"import simple as F
import multiprocessing as mp
pool = mp.Pool()
A = range(0,100)
results = pool.map(F.simple,A)
"
The error messages are shown in the attached file.
It seems a 'pickle' problem...

Best regards,
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Traceback (most recent call last):
  File "testCXX.py", line 15, in <module>
    results = pool.map(F.addition,A)
  File "/usr/lib64/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/usr/lib64/python2.7/multiprocessing/pool.py", line 558, in get
    raise self._value
cPickle.PicklingError: Can't pickle <type 'builtin_function_or_method'>: attribute lookup __builtin__.builtin_function_or_method failed