Efficient data flow between orthogonal C extensions?

[Just]

In article <slrnbe1ipf.1vo.mlh at furu.idi.ntnu.no>,
 mlh at furu.idi.ntnu.no (Magnus Lie Hetland) wrote:

> In article <fzmnvhly.fsf at python.net>, Thomas Heller wrote:
> >mlh at furu.idi.ntnu.no (Magnus Lie Hetland) writes:
> [snip]
> >I have no answer to this question, and haven't really followed the
> >thread, but I have the vague impression that ctypes could also help
> >here. It allows to create C callable callback functions from Python
> >callable objects, see the qsort example in the tutorial.
> 
> Sounds good -- but that's only under Windows? (Or?)

Windows and any unix that's supported by libffi.

Just