Function rte_seqcount_read_begin

dpdk/lib/eal/include/rte_seqcount.h:96–104

* Begin a read-side critical section. * * A call to this function marks the beginning of a read-side critical * section, for @p seqcount. * * rte_seqcount_read_begin() returns a sequence number, which is later * used in rte_seqcount_read_retry() to check if the protected data * underwent any modifications during the read transaction. * * After (in program order) rte_seqcount_read_begin()

 * @see rte_seqcount_read_retry()
 */
static inline uint32_t
rte_seqcount_read_begin(const rte_seqcount_t *seqcount)
{
	/* rte_memory_order_acquire to prevent loads after (in program order)
	 * from happening before the sn load. Synchronizes-with the
	 * store release in rte_seqcount_write_end().
	 */
	return rte_atomic_load_explicit(&seqcount->sn, rte_memory_order_acquire);
}

/**
 * End a read-side critical section.