A lock-free, concurrent, generic queue in 32 bits

While considering concurrent queue design I came up with a generic, lock-free queue that fits in a 32-bit integer. The queue is “generic” in that a single implementation supports elements of any arbitrary type, despite an implementation in C. It’s lock-free in that there is guaranteed system-wide progress. It can store up to 32,767 elements at a time — more than enough for message queues, which must always be bounded. I will first present a single-consumer, single-producer queue, then expand sup...