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You can however, pick any subsystem of an RTOS and represent that in some fashion.

Kernel Threads

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There are some RTOS functions that are implemented by internal threads \[to be provided].

The Scheduler

Schedulers and Operating Systems


The state of a thread can then be easily represented with this simple state transition diagram:

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\[to be provided]

Scheduling Policies

In order to be a real-time OS, an RTOS must support SCHED_FIFO. That is, strict priority scheduling. The thread with the highest priority runs.... Period. The thread with the highest priority is always associated with the TCB at the head of the g_readytorun list.