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C# Concurrency for Senior Engineering Interviews

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Explore the effects of compiler reordering and memory models on multithreaded C# programs. Understand how memory barriers and synchronization primitives prevent unexpected behaviors during thread execution to maintain consistent shared state visibility.

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Let's take another common example quoted in online literature that illustrates the effects of reordering operations. Study the code below:

C#
public class ReorderExample
{
    int myVal;
    bool done;
    void threadB()
    {
        if (done)
        {
            Console.WriteLine(myVal);
        }
    }
    void threadA()
    {
        myVal = 7;
        done = true;
    }
}

Say the two threads A and B run the methods threadA() and threadB() respectively. Ignoring the memory model we can conclude that there can be one of two outcomes:

  • Either nothing gets printed on the console if thread B runs before thread A.

  • 7 is printed on the console.

If we take the memory model into account, we can have any of the following outcomes:

  • Nothing ...