Answer Key: Concurrency Primitives

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Exercise 1: Design Concurrency

Question: Design concurrent access to shared resource. What primitives?

Answer

Concurrency Design: - Mutex: For exclusive access - Read-write lock: For read-heavy workloads - Channels: For communication between goroutines - Atomic operations: For simple operations

Answer: Use mutex for exclusive access, read-write locks for reads, channels for communication.

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Exercise 2: Prevent Deadlock

Question: How do you prevent deadlocks in your system?

Answer

Deadlock Prevention: 1. Lock ordering: Always acquire locks in same order 2. Timeout: Use timeout on locks 3. Avoid circular dependencies: Avoid circular lock dependencies 4. Lock-free: Use lock-free algorithms where possible

Answer: Consistent lock ordering, timeouts, avoid circular dependencies, use lock-free when possible.

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Exercise 3: Handle Race Condition

Question: Your system has a race condition. How do you fix it?

Answer

Fix Race Condition: 1. Identify: Identify shared resource and race condition 2. Add synchronization: Add locks or atomic operations 3. Test: Test thoroughly for race conditions 4. Verify: Verify fix eliminates race condition

Answer: Identify race condition, add synchronization (locks/atomics), test thoroughly, verify fix.