Single Producer Single Consumer Packet Buffer
A Single Producer Single Consumer Packet Buffer (SPSC_PBUF) is a circular buffer, whose contents are stored in first-in-first-out order. Variable size packets are stored in the buffer. Packet buffer works under assumption that there is a single context that produces packets and a single context that consumes the data.
Implementation is focused on performance and memory footprint.
Packets are added to the buffer using spsc_pbuf_write() which copies a
data into the buffer. If the buffer is full error is returned.
Packets are copied out of the buffer using spsc_pbuf_read().