Code inspection: Suspicious 'volatile' field usage: compound operation is not atomic. 'Interlocked' class can be used instead.

This inspection reports compound assignments and increment or decrement operations applied to a volatile field. Declaring a field as volatile does not make operations like +=, ++, --, or ??= atomic. These operations still perform multiple steps and can race when accessed from multiple threads.

Example

                class Counter
                {
                    private volatile int myValue;
                    void Increment()
                    {
                        myValue++;
                    }
                }
            

                using System.Threading;
                class Counter
                {
                    private int myValue;
                    void Increment()
                    {
                        Interlocked.Increment(ref myValue);
                    }
                }
            

01 April 2026