I have interviewed the author of the fascinating software Contiki OS, lwIP, uIP and protothreads, and asked him questions about the software itself, the way he develops on embedded platforms, as well as his interests in sensor networks and opensource.
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It is a trick to fake coroutines in C. I liked it very much:
http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
For once a C trick which is about making things clearer.
Thanks for the interview, very interesting reading.