<ul><li>The 'volatile' keyword in C# means not only to prevent code reordering or register caching optimizations, but also to ensure the latest value is read from main memory.</li><li>Using 'volatile' ensures that only one thread updates a variable at a time, preventing lost updates and ensuring the final result is correct.</li><li>The 'lock' statement in C# guarantees that any changes inside the lock are visible to all threads once the lock is released, and it also includes memory barriers to flush changes to main memory and ensure atomicity.</li><li>The 'Interlocked' class in C# provides atomic CPU instructions for thread-safe operations, allowing each thread to store its own counter and avoiding shared memory conflicts.</li></ul>

A Beginner’s Guide to Volatile, Interlocked, ThreadLocal, and Lock

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