On 20.09.2012 21:11, Ian Bell wrote:
Auto-pickling would be tremendously helpful as pickling and unpickling
is one of the most annoying features of working with threads and
processes in python.
How should Cython interfere how to pickle a C pointer?
cdef class foobar:
cdef double *data
A C object can be anything. Cython does not know anything about size,
offset or strides, or even if it's safe to take a copy.
Example: How to pickle a shared memory buffer? Surely we cannot take a
copy, because that would defeat the purpose of "shared" memory. And even
if could take a copy, how many bytes should be copied? Do you think an
autopickler could have figured this out?
https://github.com/sturlamolden/sharedmem-numpy/blob/master/sharedmem/sharedmemory_sysv.pyx
https://github.com/sturlamolden/sharedmem-numpy/blob/master/sharedmem/sharedmemory_win.pyx
On yes, the code is different on Unix and Windows, something the
auto-pickler could not possibly know either.
Auto-pickling cdef classes is not doable, IMHO.
And by the way, implementing a __reduce__ method manually is not very
difficult either.
Sturla Molden
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