[pypy-dev] Question about extension support

John Camara john.m.camara at gmail.com
Wed Mar 26 02:53:04 CET 2014

Hi Kevin,

Here is another link about writing extensions for PyPy.



On Tue, Mar 25, 2014 at 9:48 PM, John Camara <john.m.camara at gmail.com>wrote:

> Hi Kevin,
> More up to date information can be found on the FAQ page
> http://doc.pypy.org/en/latest/faq.html#do-cpython-extension-modules-work-with-pypy
> The best approach for PyPy is either use a pure Python module if possible
> or use a cffi wrapped extension instead of an extension that uses the
> CPython CAPI.  Often CPython CAPI extensions are wrapping some c library.
>  Creating a cffi wrapper for the library is actually much simpler than
> writing a CPython CAPI wrapper.  Quite a few CPython CAPI extensions have
> already been wrapped for cffi so make sure to search for one before
> creating your own wrapper. If you need to create a wrapper, refer to the
> cffi documentation at
> http://cffi.readthedocs.org/en/release-0.8/
> Extensions wrapped with cffi are compatible with both CPython and PyPy.
>  On CPython the performance is similar to what you would get if you used
> ctypes.  How every, under PyPy, the performance is much closer to a native
> C call plus the overhead for releasing and acquiring the gil.
> John
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