What is a deadlock and how can it be prevented?
Direct Answer
This question evaluates your knowledge of system failures in concurrent environments and strategies to avoid them.
Why Interviewers Ask This
Deadlocks can cause entire systems to hang, making prevention strategies crucial for reliability. Interviewers want to see if you understand the four necessary conditions for a deadlock and practical ways to break them. This demonstrates your ability to design robust systems that handle edge cases gracefully.
How to Answer This Question
Define deadlock as a situation where processes wait indefinitely for each other. List the four conditions: mutual exclusion, hold and wait, no preemption, and circular wait. Explain prevention techniques like ordering resources to avoid circular waits or using timeouts. Mention detection and recovery as alternative approaches.
Key Points to Cover
- Definition of deadlock
- Four necessary conditions
- Prevention strategies
- Resource ordering
Sample Answer
A deadlock occurs when two or more processes are blocked forever, each waiting for the other to release a resource. This happens when four conditions are met: mutual exclusion, hold and wait, no preemption, and circular…
Common Mistakes to Avoid
- Listing conditions without explaining prevention
- Confusing deadlock with starvation
- Ignoring circular wait condition
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