Protothreads are an extremely lightweight form of threads that run on a single stack and context switch by rewinding the stack. They require only two bytes of memory per thread and are implemented purely in C without machine-specific code. Protothreads run within a single function and are driven by repeated calls to that function, running until blocking or exiting each time.

1. Protothreads
T S Pradeep Kumar

2. Features

3. • Extremely Light weight
• Stackless Threads
• All protothreads run on the same stack and context
switching is done by stack rewinding.
• Protothread only requires only two bytes of memory per
protothread.
• protothreads are implemented in pure C and do not
require any machine-specific assembler code

4. • A protothread runs within a single C function and cannot
span over other functions
• Local variables should be used with utmost care - if in
doubt, do not use local variables inside a protothread!
• A protothread is driven by repeated calls to the function in
which the protothread is running. Each time the function
is called, the protothread will run until it blocks or exits.

6. Thank you !!!