FreeRTOS - Interrupt Management
What happens if taskEXIT_CRITICAL() is called without a matching taskENTER_CRITICAL() in FreeRTOS?
What happens if taskEXIT_CRITICAL() is called without a matching taskENTER_CRITICAL() in FreeRTOS?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand critical section nesting
taskENTER_CRITICAL() and taskEXIT_CRITICAL() must be balanced to manage interrupt state correctly.Step 2: Effect of unmatched exit
Calling exit without enter may enable interrupts too early, risking race conditions.Final Answer:
Interrupts may be enabled prematurely causing race conditions -> Option AQuick Check:
Unmatched exit causes premature interrupt enable = True [OK]
Quick Trick: Always balance taskENTER_CRITICAL() with taskEXIT_CRITICAL() [OK]
Common Mistakes:
- Assuming no effect if exit called alone
- Thinking system hangs on unmatched exit
- Believing task suspension occurs automatically
Master "Interrupt Management" in FreeRTOS
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