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- Protothreads are extremely lightweight stackless threads designed for
- severely memory constrained systems such as small embedded systems or
- sensor network nodes. Protothreads can be used with or without an
- underlying operating system.
- Protothreads provides a blocking context on top of an event-driven
- system, without the overhead of per-thread stacks. The purpose of
- protothreads is to implement sequential flow of control without
- complex state machines or full multi-threading.
- Main features:
- * No machine specific code - the protothreads library is pure C
- * Does not use error-prone functions such as longjmp()
- * Very small RAM overhead - only two bytes per protothread
- * Can be used with or without an OS
- * Provides blocking wait without full multi-threading or
- stack-switching
- * Freely available under a BSD-like open source license
- Example applications:
- * Memory constrained systems
- * Event-driven protocol stacks
- * Small embedded systems
- * Sensor network nodes
- The protothreads library is released under an open source BSD-style
- license that allows for both non-commercial and commercial usage. The
- only requirement is that credit is given.
- The protothreads library was written by Adam Dunkels <adam@sics.se>
- with support from Oliver Schmidt <ol.sc@web.de>.
- More information and new versions can be found at the protothreads
- homepage:
- http://www.sics.se/~adam/pt/
- Documentation can be found in the doc/ subdirectory.
- Two example programs illustrating the use of protothreads can be found
- in this directory:
- example-small.c A small example showing how to use protothreads
- example-buffer.c The bounded buffer problem with protothreads
- example-codelock.c A code lock with simulated key input
- To compile the examples, simply run "make".
- Adam Dunkels, 3 June 2006
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