Mailbox Mode

In other use cases, it is more important that the consumer always have the most recent input available. In this case, the stream application operates in mailbox mode. If the consumer has not started processing a previous frame when a new one becomes available, it is skipped, and its buffer immediately returned to the producer for reuse. This means that the order in which the producer and consumer cycle through buffers is subject to change at any time, and the streaming system must manage this.