[adrian_b]

Like for any algorithm choice, the optimal choice depends on the context.

On a desktop/laptop computer, wasting a queue slot matters very little, but it may be useful to achieve the maximum speed, so this method does not seem preferable.

On the other hand, in many microcontroller applications there is no other read/write RAM, but a few kilobytes of internal MCU RAM. So the amount of used RAM may be the most important resource and there may be many FIFO queues for various peripheral interfaces.

For such MCU applications, it is valuable to be aware of this alternative FIFO queue implementation, as it may be the best choice.