Thanks Matt. I shall need to do more testing. The right answer is probably use atomics but that has a performance cost. I am still trying to find out if atomi

Thanks Matt. I shall need to do more testing. The right answer is probably use atomics but that has a performance cost. I am still trying to find out if atomics suffer from contendedness. My perfect scenario is the atomic increment should be as cheap as the non atomic increment. But I think the bus pausing and cache coherence protocols mean that the data is flushed from the store buffer to the memory, which is slow. I don't know if it acts as a lock and has an uncontended option