u64 (*ring_buffer_clock_read) (struct channel *chan);
size_t (*record_header_size) (const struct lib_ring_buffer_config *config,
struct channel *chan, size_t offset,
u64 (*ring_buffer_clock_read) (struct channel *chan);
size_t (*record_header_size) (const struct lib_ring_buffer_config *config,
struct channel *chan, size_t offset,
struct lib_ring_buffer_ctx *ctx);
/* Slow path only, at subbuffer switch */
struct lib_ring_buffer_ctx *ctx);
/* Slow path only, at subbuffer switch */