FreeRTOS - Task Scheduling
In FreeRTOS with preemptive scheduling, three tasks exist: TaskA (priority 2), TaskB (priority 3), and TaskC (priority 1). TaskB blocks waiting for a mutex. Which task runs next?
In FreeRTOS with preemptive scheduling, three tasks exist: TaskA (priority 2), TaskB (priority 3), and TaskC (priority 1). TaskB blocks waiting for a mutex. Which task runs next?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify task states
TaskB is blocked waiting for a mutex, so it cannot run.Step 2: Determine highest priority ready task
TaskA (priority 2) and TaskC (priority 1) are ready; TaskA has higher priority.Step 3: Scheduler decision
The scheduler runs the highest priority ready task, which is TaskA.Final Answer:
TaskA runs because it has the highest ready priority -> Option AQuick Check:
Blocked tasks do not run; highest ready priority runs [OK]
Quick Trick: Blocked tasks don't run; highest ready priority task runs [OK]
Common Mistakes:
- Assuming blocked task runs
- Choosing lower priority ready task
- Thinking idle task runs unnecessarily
Master "Task Scheduling" in FreeRTOS
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