Choosing an RTOS - IAR Systems
Choosing an RTOS - IAR Systems
Choosing an RTOS - IAR Systems
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How to choose <strong>an</strong> <strong>RTOS</strong> – ESC 2011<br />
Common features of <strong>RTOS</strong>s<br />
Task schedulers<br />
• Different <strong>RTOS</strong>s use different scheduling algorithms<br />
• Co-operative schedulers require the tasks to yield( )<br />
in order to allow other tasks to execute.<br />
• Pre-emptive schedulers are more common in <strong>RTOS</strong>s<br />
<strong>an</strong>d may take several forms:<br />
• Round-robin scheduling, where each task gets a<br />
time-slice of the MCU<br />
• Fixed-priority pre-emptive, which ensures that the<br />
next task with the highest priority gets executed<br />
• Rate-monotonic scheduling, where the task with<br />
the shortest duration has the highest priority<br />
• And others…<br />
• Some schedulers are more susceptible to priority inversion<br />
th<strong>an</strong> others, so be aware of deadlocks!
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