Operating Systems - Semaphore vs Mutex - When to Use Which
What typically occurs if a thread tries to unlock a mutex that it has not previously locked?
What typically occurs if a thread tries to unlock a mutex that it has not previously locked?
easy📖 Theory Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand mutex ownership
Mutexes enforce ownership; only the locking thread can unlock.Step 2: Behavior on unlocking by non-owner
Unlocking by a non-owner usually causes an error or undefined behavior.Final Answer:
Option A -> Option AQuick Check:
Mutex ownership violation triggers error [OK]
Quick Trick: Only owner thread can unlock mutex [OK]
Common Mistakes:
MISTAKES- Assuming mutex unlock always succeeds
- Confusing mutex with semaphore behavior
- Thinking thread blocks on unlock
Trap Explanation:
PITFALL- Unlocking by non-owner is not allowed, unlike semaphore post
Interviewer Note:
CONTEXT- Tests knowledge of mutex ownership and error handling
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