RTEMS C User's Guide
The Idle Task is the lowest priority task in a system and executes only when no other task is ready to execute. This default implementation of this task consists of an infinite loop. RTEMS allows the Idle Task body to be replaced by a CPU specific implementation, a BSP specific implementation or an application specific implementation.
The Idle Task is preemptible and WILL be preempted when any other task is made ready to execute. This characteristic is critical to the overall behavior of any application.
RTEMS C User's Guide
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