Your code is strange. It exchanges pointer between processes if I understand correctly:

  class Berbagi(ctypes.Structure):
    _fields_ = [('a', ctypes.c_wchar_p), ('b', ctypes.c_double) ]
  nilai = multiprocessing.Array(Berbagi, [Berbagi() for x in range(9)] )

You must not do that. Instead, Berbagi.a must be an array of c_wchar characters with a fixed size. Try for example:

  class Berbagi(ctypes.Structure):
    _fields_ = [('a', ctypes.c_wchar * 10), ('b', ctypes.c_double) ]

Note: I'm not sure that ctypes is the most efficient module to serialize data, but maybe you have to use ctypes for a reason not explained in your issue.

The bug is in your code, not in Python.