Function rte_timecounter_update

dpdk/lib/eal/include/rte_time.h:55–77

* Update the internal nanosecond count in the structure. */

 * Update the internal nanosecond count in the structure.
 */
static inline uint64_t
rte_timecounter_update(struct rte_timecounter *tc, uint64_t cycle_now)
{
	uint64_t cycle_delta, ns_offset;

	/* Calculate the delta since the last call. */
	if (tc->cycle_last <= cycle_now)
		cycle_delta = (cycle_now - tc->cycle_last) & tc->cc_mask;
	else
		/* Handle cycle counts that have wrapped around . */
		cycle_delta = (~(tc->cycle_last - cycle_now) & tc->cc_mask) + 1;

	/* Convert to nanoseconds. */
	ns_offset = rte_cyclecounter_cycles_to_ns(tc, cycle_delta);

	/* Store current cycle counter for next call. */
	tc->cycle_last = cycle_now;

	/* Update the nanosecond count. */
	tc->nsec += ns_offset;

	return tc->nsec;
}

/**
 * Convert from timespec structure into nanosecond units.