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Home Interviews What is the difference between lock, Monitor, and SemaphoreSlim? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 20 Jun 2025
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Answer:

  • lock (syntactic sugar for Monitor.Enter/Exit): Simple mutual exclusion for single-threaded access.
  • Monitor: Offers TryEnter, timeout, and Pulse/Wait methods.
  • SemaphoreSlim: Lightweight, used to limit concurrency (e.g., allow N threads at a time).
lock (_lockObj) { /* critical section */ }

// or if (Monitor.TryEnter(_lockObj, TimeSpan.FromSeconds(1))) {
   try { /* critical section */ } finally { Monitor.Exit(_lockObj); }
}

Use lock for simplicity, Monitor for more control, and SemaphoreSlim for async or limited-thread scenarios.

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