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Protothreads for UNIX
By Thom Holwerda, submitted by anonymous on 2009-01-18 11:16:41
Protothreads are a type of extremely lightweight threads - each protothread requires only two bytes of memory - that are usually used for embedded firmware programming, where memory is at a premium. Protothreads combine the low overhead with event-driven programming with the algorithmic clarity of threaded programming.

Larry Ruane from LeftHand Networks Inc. has written a protothreads library for Unix systems that, unlike Adam Dunkels' original library, contains a complete scheduler that allows several protothreads to run inside a regular thread. Ruane's protothreads are implemented in less than 400 lines of C code using gcc's labels-as-values feature. The project wiki has a thorough explanation of how protothreads work and how they are intended to be used. The open source code can be downloaded from the project's SourceForge page.

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